904 lines
30 KiB
Python
904 lines
30 KiB
Python
from django.core.urlresolvers import reverse
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from django.db import models
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from django.db.models import Max
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from django.utils import formats
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from django.utils.translation import ugettext as _
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from django.utils.translation import ugettext_lazy, ugettext_noop
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from openslides.config.api import config
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from openslides.core.models import Tag
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from openslides.mediafile.models import Mediafile
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from openslides.poll.models import (BaseOption, BasePoll, BaseVote, CollectDefaultVotesMixin)
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from openslides.projector.models import RelatedModelMixin, SlideMixin
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from jsonfield import JSONField
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from openslides.utils.models import AbsoluteUrlMixin
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from openslides.users.models import User
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from .exceptions import WorkflowError
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class Motion(SlideMixin, AbsoluteUrlMixin, models.Model):
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"""
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The Motion Class.
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This class is the main entry point to all other classes related to a motion.
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"""
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slide_callback_name = 'motion'
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"""
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Name of the callback for the slide-system.
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"""
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active_version = models.ForeignKey('MotionVersion', null=True,
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related_name="active_version",
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on_delete=models.SET_NULL)
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"""
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Points to a specific version.
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Used be the permitted-version-system to deside which version is the active
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version. Could also be used to only choose a specific version as a default
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version. Like the sighted versions on Wikipedia.
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"""
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state = models.ForeignKey('State', null=True) # TODO: Check whether null=True is necessary.
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"""
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The related state object.
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This attribute is to get the current state of the motion.
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"""
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identifier = models.CharField(max_length=255, null=True, blank=True,
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unique=True)
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"""
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A string as human readable identifier for the motion.
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"""
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identifier_number = models.IntegerField(null=True)
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"""
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Counts the number of the motion in one category.
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Needed to find the next free motion-identifier.
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"""
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category = models.ForeignKey('Category', null=True, blank=True)
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"""
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ForeignKey to one category of motions.
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"""
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attachments = models.ManyToManyField(Mediafile)
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"""
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Many to many relation to mediafile objects.
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"""
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parent = models.ForeignKey('self', null=True, blank=True, related_name='amendments')
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"""
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Field for amendments to reference to the motion that should be altered.
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Null if the motion is not an amendment.
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"""
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tags = models.ManyToManyField(Tag)
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"""
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Tags to categorise motions.
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"""
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class Meta:
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permissions = (
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('can_see_motion', ugettext_noop('Can see motions')),
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('can_create_motion', ugettext_noop('Can create motions')),
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('can_support_motion', ugettext_noop('Can support motions')),
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('can_manage_motion', ugettext_noop('Can manage motions')),
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)
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ordering = ('identifier', )
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verbose_name = ugettext_noop('Motion')
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def __str__(self):
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"""
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Return a human readable name of this motion.
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"""
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if self.identifier:
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string = '%s | %s' % (self.identifier, self.title)
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else:
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string = self.title
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return string
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# TODO: Use transaction
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def save(self, use_version=None, *args, **kwargs):
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"""
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Save the motion.
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1. Set the state of a new motion to the default state.
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2. Ensure that the identifier is not an empty string.
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3. Save the motion object.
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4. Save the version data.
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5. Set the active version for the motion if a new version object was saved.
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The version data is *not* saved, if
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1. the django-feature 'update_fields' is used or
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2. the argument use_version is False (differ to None).
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The argument use_version is choose the version object into which the
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version data is saved.
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* If use_version is False, no version data is saved.
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* If use_version is None, the last version is used.
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* Else the given version is used.
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To create and use a new version object, you have to set it via the
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use_version argument. You have to set the title, text and reason into
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this version object before giving it to this save method. The properties
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motion.title, motion.text and motion.reason will be ignored.
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"""
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if not self.state:
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self.reset_state()
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# Solves the problem, that there can only be one motion with an empty
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# string as identifier.
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if not self.identifier and isinstance(self.identifier, str):
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self.identifier = None
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super(Motion, self).save(*args, **kwargs)
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if 'update_fields' in kwargs:
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# Do not save the version data if only some motion fields are updated.
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return
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if use_version is False:
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# We do not need to save the version.
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return
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elif use_version is None:
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use_version = self.get_last_version()
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# Save title, text and reason into the version object.
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for attr in ['title', 'text', 'reason']:
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_attr = '_%s' % attr
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data = getattr(self, _attr, None)
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if data is not None:
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setattr(use_version, attr, data)
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delattr(self, _attr)
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# If version is not in the database, test if it has new data and set
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# the version_number.
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if use_version.id is None:
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if not self.version_data_changed(use_version):
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# We do not need to save the version.
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return
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version_number = self.versions.aggregate(Max('version_number'))['version_number__max'] or 0
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use_version.version_number = version_number + 1
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# Necessary line if the version was set before the motion got an id.
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# This is probably a Django bug.
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use_version.motion = use_version.motion
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use_version.save()
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# Set the active version of this motion. This has to be done after the
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# version is saved in the database.
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# TODO: Move parts of these last lines of code outside the save method
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# when other versions than the last ones should be edited later on.
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if self.active_version is None or not self.state.leave_old_version_active:
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# TODO: Don't call this if it was not a new version
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self.active_version = use_version
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self.save(update_fields=['active_version'])
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def get_absolute_url(self, link='detail'):
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"""
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Return an URL for this version.
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The keyword argument 'link' can be 'detail', 'update' or 'delete'.
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"""
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if link == 'detail':
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url = reverse('motion_detail', args=[str(self.pk)])
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elif link == 'update':
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url = reverse('motion_update', args=[str(self.pk)])
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elif link == 'delete':
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url = reverse('motion_delete', args=[str(self.pk)])
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else:
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url = super(Motion, self).get_absolute_url(link)
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return url
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def version_data_changed(self, version):
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"""
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Compare the version with the last version of the motion.
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Returns True if the version data (title, text, reason) is different,
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else returns False.
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"""
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if not self.versions.exists():
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# If there is no version in the database, the data has always changed.
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return True
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last_version = self.get_last_version()
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for attr in ['title', 'text', 'reason']:
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if getattr(last_version, attr) != getattr(version, attr):
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return True
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return False
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def set_identifier(self):
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"""
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Sets the motion identifier automaticly according to the config value if
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it is not set yet.
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"""
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# The identifier is already set or should be set manually
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if config['motion_identifier'] == 'manually' or self.identifier:
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# Do not set an identifier.
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return
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# The motion is an amendment
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elif self.is_amendment():
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motions = self.parent.amendments.all()
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# The motions should be counted per category
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elif config['motion_identifier'] == 'per_category':
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motions = Motion.objects.filter(category=self.category)
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# The motions should be counted over all.
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else:
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motions = Motion.objects.all()
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number = motions.aggregate(Max('identifier_number'))['identifier_number__max'] or 0
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if self.is_amendment():
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parent_identifier = self.parent.identifier or ''
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prefix = '%s %s ' % (parent_identifier, config['motion_amendments_prefix'])
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elif self.category is None or not self.category.prefix:
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prefix = ''
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else:
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prefix = '%s ' % self.category.prefix
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number += 1
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identifier = '%s%d' % (prefix, number)
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while Motion.objects.filter(identifier=identifier).exists():
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number += 1
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identifier = '%s%d' % (prefix, number)
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self.identifier = identifier
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self.identifier_number = number
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def get_title(self):
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"""
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Get the title of the motion.
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The title is taken from motion.version.
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"""
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try:
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return self._title
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except AttributeError:
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return self.get_active_version().title
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def set_title(self, title):
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"""
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Set the title of the motion.
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The title will be saved in the version object, when motion.save() is
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called.
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"""
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self._title = title
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title = property(get_title, set_title)
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"""
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The title of the motion.
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Is saved in a MotionVersion object.
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"""
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def get_text(self):
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"""
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Get the text of the motion.
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Simular to get_title().
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"""
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try:
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return self._text
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except AttributeError:
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return self.get_active_version().text
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def set_text(self, text):
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"""
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Set the text of the motion.
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Simular to set_title().
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"""
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self._text = text
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text = property(get_text, set_text)
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"""
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The text of a motin.
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Is saved in a MotionVersion object.
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"""
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def get_reason(self):
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"""
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Get the reason of the motion.
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Simular to get_title().
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"""
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try:
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return self._reason
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except AttributeError:
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return self.get_active_version().reason
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def set_reason(self, reason):
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"""
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Set the reason of the motion.
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Simular to set_title().
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"""
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self._reason = reason
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reason = property(get_reason, set_reason)
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"""
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The reason for the motion.
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Is saved in a MotionVersion object.
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"""
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def get_new_version(self, **kwargs):
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"""
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Return a version object, not saved in the database.
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The version data of the new version object is populated with the data
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set via motion.title, motion.text, motion.reason if these data are
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not given as keyword arguments. If the data is not set in the motion
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attributes, it is populated with the data from the last version
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object if such object exists.
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"""
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new_version = MotionVersion(motion=self, **kwargs)
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if self.versions.exists():
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last_version = self.get_last_version()
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else:
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last_version = None
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for attr in ['title', 'text', 'reason']:
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if attr in kwargs:
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continue
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_attr = '_%s' % attr
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data = getattr(self, _attr, None)
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if data is None and last_version is not None:
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data = getattr(last_version, attr)
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if data is not None:
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setattr(new_version, attr, data)
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return new_version
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def get_active_version(self):
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"""
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Returns the active version of the motion.
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If no active version is set by now, the last_version is used.
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"""
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if self.active_version:
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return self.active_version
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else:
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return self.get_last_version()
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def get_last_version(self):
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"""
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Return the newest version of the motion.
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"""
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try:
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return self.versions.order_by('-version_number')[0]
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except IndexError:
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return self.get_new_version()
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@property
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def submitters(self):
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return sorted([object.person for object in self.submitter.all()],
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key=lambda person: person.sort_name)
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def is_submitter(self, person):
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"""Return True, if person is a submitter of this motion. Else: False."""
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return self.submitter.filter(person=person).exists()
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@property
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def supporters(self):
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return [supporter.person for supporter in self.supporter.all()]
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def add_submitter(self, person):
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MotionSubmitter.objects.create(motion=self, person=person)
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def clear_submitters(self):
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MotionSubmitter.objects.filter(motion=self).delete()
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def is_supporter(self, person):
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"""
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Return True, if person is a supporter of this motion. Else: False.
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"""
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return self.supporter.filter(person=person).exists()
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def support(self, person):
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"""
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Add 'person' as a supporter of this motion.
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"""
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if self.state.allow_support:
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if not self.is_supporter(person):
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MotionSupporter(motion=self, person=person).save()
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else:
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raise WorkflowError('You can not support a motion in state %s.' % self.state.name)
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def unsupport(self, person):
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"""
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Remove 'person' as supporter from this motion.
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"""
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if self.state.allow_support:
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self.supporter.filter(person=person).delete()
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else:
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raise WorkflowError('You can not unsupport a motion in state %s.' % self.state.name)
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def clear_supporters(self):
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"""
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Deletes all supporters of this motion.
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"""
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MotionSupporter.objects.filter(motion=self).delete()
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def create_poll(self):
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"""
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Create a new poll for this motion.
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Return the new poll object.
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"""
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if self.state.allow_create_poll:
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# TODO: auto increment the poll_number in the database
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poll_number = self.polls.aggregate(Max('poll_number'))['poll_number__max'] or 0
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poll = MotionPoll.objects.create(motion=self, poll_number=poll_number + 1)
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poll.set_options()
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return poll
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else:
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raise WorkflowError('You can not create a poll in state %s.' % self.state.name)
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def set_state(self, state):
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"""
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Set the state of the motion.
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'state' can be the id of a state object or a state object.
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"""
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if type(state) is int:
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state = State.objects.get(pk=state)
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if not state.dont_set_identifier:
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self.set_identifier()
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self.state = state
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def reset_state(self, workflow=None):
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"""
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Set the state to the default state.
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'workflow' can be a workflow, an id of a workflow or None.
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If the motion is new and workflow is None, it chooses the default
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workflow from config.
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"""
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if type(workflow) is int:
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workflow = Workflow.objects.get(pk=workflow)
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if workflow is not None:
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new_state = workflow.first_state
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elif self.state:
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new_state = self.state.workflow.first_state
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else:
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new_state = (Workflow.objects.get(pk=config['motion_workflow']).first_state or
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Workflow.objects.get(pk=config['motion_workflow']).state_set.all()[0])
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self.set_state(new_state)
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def get_agenda_title(self):
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"""
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Return a title for the agenda.
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"""
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return str(self)
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def get_agenda_title_supplement(self):
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"""
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Returns the supplement to the title for the agenda item.
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"""
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return '(%s)' % _('Motion')
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def get_allowed_actions(self, person):
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"""
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Return a dictonary with all allowed actions for a specific person.
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The dictonary contains the following actions.
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* see
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* update / edit
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* delete
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* create_poll
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* support
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* unsupport
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* change_state
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* reset_state
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"""
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actions = {
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'see': (person.has_perm('motion.can_see_motion') and
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(not self.state.required_permission_to_see or
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person.has_perm(self.state.required_permission_to_see) or
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self.is_submitter(person))),
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'update': (person.has_perm('motion.can_manage_motion') or
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(self.is_submitter(person) and
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self.state.allow_submitter_edit)),
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'delete': person.has_perm('motion.can_manage_motion'),
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'create_poll': (person.has_perm('motion.can_manage_motion') and
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self.state.allow_create_poll),
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'support': (self.state.allow_support and
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config['motion_min_supporters'] > 0 and
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not self.is_submitter(person) and
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not self.is_supporter(person)),
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'unsupport': (self.state.allow_support and
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self.is_supporter(person)),
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'change_state': person.has_perm('motion.can_manage_motion'),
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'reset_state': person.has_perm('motion.can_manage_motion')}
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actions['edit'] = actions['update']
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return actions
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def write_log(self, message_list, person=None):
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"""
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Write a log message.
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The message should be in English and translatable,
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e. g. motion.write_log(message_list=[ugettext_noop('Message Text')])
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"""
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MotionLog.objects.create(motion=self, message_list=message_list, person=person)
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def is_amendment(self):
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"""
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Returns True if the motion is an amendment.
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A motion is a amendment if amendments are activated in the config and
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the motion has a parent.
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"""
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return config['motion_amendments_enabled'] and self.parent is not None
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|
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class MotionVersion(AbsoluteUrlMixin, models.Model):
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"""
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A MotionVersion object saves some date of the motion.
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"""
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|
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motion = models.ForeignKey(Motion, related_name='versions')
|
|
"""The motion to which the version belongs."""
|
|
|
|
version_number = models.PositiveIntegerField(default=1)
|
|
"""An id for this version in realation to a motion.
|
|
|
|
Is unique for each motion.
|
|
"""
|
|
|
|
title = models.CharField(max_length=255, verbose_name=ugettext_lazy("Title"))
|
|
"""The title of a motion."""
|
|
|
|
text = models.TextField(verbose_name=ugettext_lazy("Text"))
|
|
"""The text of a motion."""
|
|
|
|
reason = models.TextField(null=True, blank=True, verbose_name=ugettext_lazy("Reason"))
|
|
"""The reason for a motion."""
|
|
|
|
creation_time = models.DateTimeField(auto_now=True)
|
|
"""Time when the version was saved."""
|
|
|
|
# identifier = models.CharField(max_length=255, verbose_name=ugettext_lazy("Version identifier"))
|
|
# note = models.TextField(null=True, blank=True)
|
|
|
|
class Meta:
|
|
unique_together = ("motion", "version_number")
|
|
|
|
def __str__(self):
|
|
"""Return a string, representing this object."""
|
|
counter = self.version_number or ugettext_lazy('new')
|
|
return "Motion %s, Version %s" % (self.motion_id, counter)
|
|
|
|
def get_absolute_url(self, link='detail'):
|
|
"""
|
|
Return the URL of this Version.
|
|
|
|
The keyargument link can be 'detail' or 'delete'.
|
|
"""
|
|
if link == 'detail':
|
|
url = reverse('motion_version_detail', args=[str(self.motion.pk),
|
|
str(self.version_number)])
|
|
elif link == 'delete':
|
|
url = reverse('motion_version_delete', args=[str(self.motion.pk),
|
|
str(self.version_number)])
|
|
else:
|
|
url = super(MotionVersion, self).get_absolute_url(link)
|
|
return url
|
|
|
|
@property
|
|
def active(self):
|
|
"""Return True, if the version is the active version of a motion. Else: False."""
|
|
return self.active_version.exists()
|
|
|
|
|
|
class MotionSubmitter(RelatedModelMixin, models.Model):
|
|
"""Save the submitter of a Motion."""
|
|
|
|
motion = models.ForeignKey('Motion', related_name="submitter")
|
|
"""The motion to witch the object belongs."""
|
|
|
|
person = models.ForeignKey(User)
|
|
"""The user, who is the submitter."""
|
|
|
|
def __str__(self):
|
|
"""Return the name of the submitter as string."""
|
|
return str(self.person)
|
|
|
|
def get_related_model(self):
|
|
return self.motion
|
|
|
|
|
|
class MotionSupporter(models.Model):
|
|
"""Save the submitter of a Motion."""
|
|
|
|
motion = models.ForeignKey('Motion', related_name="supporter")
|
|
"""The motion to witch the object belongs."""
|
|
|
|
person = models.ForeignKey(User)
|
|
"""The person, who is the supporter."""
|
|
|
|
def __str__(self):
|
|
"""Return the name of the supporter as string."""
|
|
return str(self.person)
|
|
|
|
|
|
class Category(AbsoluteUrlMixin, models.Model):
|
|
name = models.CharField(max_length=255, verbose_name=ugettext_lazy("Category name"))
|
|
"""Name of the category."""
|
|
|
|
prefix = models.CharField(blank=True, max_length=32, verbose_name=ugettext_lazy("Prefix"))
|
|
"""Prefix of the category.
|
|
|
|
Used to build the identifier of a motion.
|
|
"""
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
def get_absolute_url(self, link='update'):
|
|
if link == 'update':
|
|
url = reverse('motion_category_update', args=[str(self.pk)])
|
|
elif link == 'delete':
|
|
url = reverse('motion_category_delete', args=[str(self.pk)])
|
|
else:
|
|
url = super(Category, self).get_absolute_url(link)
|
|
return url
|
|
|
|
class Meta:
|
|
ordering = ['prefix']
|
|
|
|
|
|
class MotionLog(models.Model):
|
|
"""Save a logmessage for a motion."""
|
|
|
|
motion = models.ForeignKey(Motion, related_name='log_messages')
|
|
"""The motion to witch the object belongs."""
|
|
|
|
message_list = JSONField()
|
|
"""
|
|
The log message. It should be a list of strings in english.
|
|
"""
|
|
|
|
person = models.ForeignKey(User, null=True)
|
|
"""A person object, who created the log message. Optional."""
|
|
|
|
time = models.DateTimeField(auto_now=True)
|
|
"""The Time, when the loged action was performed."""
|
|
|
|
class Meta:
|
|
ordering = ['-time']
|
|
|
|
def __str__(self):
|
|
"""
|
|
Return a string, representing the log message.
|
|
"""
|
|
time = formats.date_format(self.time, 'DATETIME_FORMAT')
|
|
time_and_messages = '%s ' % time + ''.join(map(_, self.message_list))
|
|
if self.person is not None:
|
|
return _('%(time_and_messages)s by %(person)s') % {'time_and_messages': time_and_messages,
|
|
'person': self.person}
|
|
return time_and_messages
|
|
|
|
|
|
class MotionVote(BaseVote):
|
|
"""Saves the votes for a MotionPoll.
|
|
|
|
There should allways be three MotionVote objects for each poll,
|
|
one for 'yes', 'no', and 'abstain'."""
|
|
|
|
option = models.ForeignKey('MotionOption')
|
|
"""The option object, to witch the vote belongs."""
|
|
|
|
|
|
class MotionOption(BaseOption):
|
|
"""Links between the MotionPollClass and the MotionVoteClass.
|
|
|
|
There should be one MotionOption object for each poll."""
|
|
|
|
poll = models.ForeignKey('MotionPoll')
|
|
"""The poll object, to witch the object belongs."""
|
|
|
|
vote_class = MotionVote
|
|
"""The VoteClass, to witch this Class links."""
|
|
|
|
|
|
class MotionPoll(SlideMixin, RelatedModelMixin, CollectDefaultVotesMixin,
|
|
AbsoluteUrlMixin, BasePoll):
|
|
"""The Class to saves the vote result for a motion poll."""
|
|
|
|
slide_callback_name = 'motionpoll'
|
|
"""Name of the callback for the slide-system."""
|
|
|
|
motion = models.ForeignKey(Motion, related_name='polls')
|
|
"""The motion to witch the object belongs."""
|
|
|
|
option_class = MotionOption
|
|
"""The option class, witch links between this object the the votes."""
|
|
|
|
vote_values = [
|
|
ugettext_noop('Yes'), ugettext_noop('No'), ugettext_noop('Abstain')]
|
|
"""The possible anwers for the poll. 'Yes, 'No' and 'Abstain'."""
|
|
|
|
poll_number = models.PositiveIntegerField(default=1)
|
|
"""An id for this poll in realation to a motion.
|
|
|
|
Is unique for each motion.
|
|
"""
|
|
|
|
class Meta:
|
|
unique_together = ("motion", "poll_number")
|
|
|
|
def __str__(self):
|
|
"""Return a string, representing the poll."""
|
|
return _('Vote %d') % self.poll_number
|
|
|
|
def get_absolute_url(self, link='update'):
|
|
"""
|
|
Return an URL for the poll.
|
|
|
|
The keyargument 'link' can be 'update' or 'delete'.
|
|
"""
|
|
if link == 'update':
|
|
url = reverse('motionpoll_update', args=[str(self.motion.pk),
|
|
str(self.poll_number)])
|
|
elif link == 'delete':
|
|
url = reverse('motionpoll_delete', args=[str(self.motion.pk),
|
|
str(self.poll_number)])
|
|
else:
|
|
url = super(MotionPoll, self).get_absolute_url(link)
|
|
return url
|
|
|
|
def set_options(self):
|
|
"""Create the option class for this poll."""
|
|
# TODO: maybe it is possible with .create() to call this without poll=self
|
|
# or call this in save()
|
|
self.get_option_class()(poll=self).save()
|
|
|
|
def get_related_model(self):
|
|
return self.motion
|
|
|
|
def get_percent_base_choice(self):
|
|
return config['motion_poll_100_percent_base']
|
|
|
|
def get_slide_context(self, **context):
|
|
return super(MotionPoll, self).get_slide_context(poll=self)
|
|
|
|
|
|
class State(models.Model):
|
|
"""
|
|
Defines a state for a motion.
|
|
|
|
Every state belongs to a workflow. All states of a workflow are linked together
|
|
via 'next_states'. One of these states is the first state, but this
|
|
is saved in the workflow table (one-to-one relation). In every state
|
|
you can configure some handling of a motion. See the following fields
|
|
for more information.
|
|
"""
|
|
|
|
name = models.CharField(max_length=255)
|
|
"""A string representing the state."""
|
|
|
|
action_word = models.CharField(max_length=255)
|
|
"""An alternative string to be used for a button to switch to this state."""
|
|
|
|
workflow = models.ForeignKey('Workflow')
|
|
"""A many-to-one relation to a workflow."""
|
|
|
|
next_states = models.ManyToManyField('self', symmetrical=False)
|
|
"""A many-to-many relation to all states, that can be choosen from this state."""
|
|
|
|
icon = models.CharField(max_length=255)
|
|
"""A string representing the url to the icon-image."""
|
|
|
|
required_permission_to_see = models.CharField(max_length=255, blank=True)
|
|
"""
|
|
A permission string. If not empty, the user has to have this permission to
|
|
see a motion in this state.
|
|
|
|
To use this feature change the database entry of a state object and add
|
|
your favourite permission string. You can do this e. g. by editing the
|
|
definitions in create_builtin_workflows() in openslides/motion/signals.py.
|
|
"""
|
|
|
|
allow_support = models.BooleanField(default=False)
|
|
"""If true, persons can support the motion in this state."""
|
|
|
|
allow_create_poll = models.BooleanField(default=False)
|
|
"""If true, polls can be created in this state."""
|
|
|
|
allow_submitter_edit = models.BooleanField(default=False)
|
|
"""If true, the submitter can edit the motion in this state."""
|
|
|
|
versioning = models.BooleanField(default=False)
|
|
"""
|
|
If true, editing the motion will create a new version by default.
|
|
This behavior can be changed by the form and view, e. g. via the
|
|
MotionDisableVersioningMixin.
|
|
"""
|
|
|
|
leave_old_version_active = models.BooleanField(default=False)
|
|
"""If true, new versions are not automaticly set active."""
|
|
|
|
dont_set_identifier = models.BooleanField(default=False)
|
|
"""
|
|
Decides if the motion gets an identifier.
|
|
|
|
If true, the motion does not get an identifier if the state change to
|
|
this one, else it does.
|
|
"""
|
|
|
|
def __str__(self):
|
|
"""Returns the name of the state."""
|
|
return self.name
|
|
|
|
def save(self, **kwargs):
|
|
"""Saves a state in the database.
|
|
|
|
Used to check the integrity before saving.
|
|
"""
|
|
self.check_next_states()
|
|
super(State, self).save(**kwargs)
|
|
|
|
def get_action_word(self):
|
|
"""Returns the alternative name of the state if it exists."""
|
|
return self.action_word or self.name
|
|
|
|
def check_next_states(self):
|
|
"""Checks whether all next states of a state belong to the correct workflow."""
|
|
# No check if it is a new state which has not been saved yet.
|
|
if not self.id:
|
|
return
|
|
for state in self.next_states.all():
|
|
if not state.workflow == self.workflow:
|
|
raise WorkflowError('%s can not be next state of %s because it does not belong to the same workflow.' % (state, self))
|
|
|
|
|
|
class Workflow(models.Model):
|
|
"""Defines a workflow for a motion."""
|
|
|
|
name = models.CharField(max_length=255)
|
|
"""A string representing the workflow."""
|
|
|
|
first_state = models.OneToOneField(State, related_name='+', null=True)
|
|
"""A one-to-one relation to a state, the starting point for the workflow."""
|
|
|
|
def __str__(self):
|
|
"""Returns the name of the workflow."""
|
|
return self.name
|
|
|
|
def save(self, **kwargs):
|
|
"""Saves a workflow in the database.
|
|
|
|
Used to check the integrity before saving.
|
|
"""
|
|
self.check_first_state()
|
|
super(Workflow, self).save(**kwargs)
|
|
|
|
def check_first_state(self):
|
|
"""Checks whether the first_state itself belongs to the workflow."""
|
|
if self.first_state and not self.first_state.workflow == self:
|
|
raise WorkflowError(
|
|
'%s can not be first state of %s because it '
|
|
'does not belong to it.' % (self.first_state, self))
|