OpenSlides/openslides/core/models.py

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from django.db import models
from django.utils.translation import ugettext as _
from django.utils.translation import ugettext_lazy, ugettext_noop
from jsonfield import JSONField
from openslides.utils.projector import ProjectorElement
from openslides.utils.rest_api import RESTModelMixin
from .exceptions import ProjectorException
class Projector(RESTModelMixin, models.Model):
"""
Model for all projectors. At the moment we support only one projector,
the default projector (pk=1).
If the config field is empty or invalid the projector shows a default
slide. To activate a slide and extra projector elements, save valid
JSON to the config field.
Example: [{"name": "core/customslide", "id": 2},
{"name": "core/countdown", "countdown_time": 20, "status": "stop"},
{"name": "core/clock", "stable": true}]
This can be done using the REST API with POST requests on e. g. the URL
/rest/core/projector/1/activate_projector_elements/. The data have to be
a list of dictionaries. Every dictionary must have at least the
property "name". The property "stable" is to set whether this element
should disappear on prune or clear requests.
"""
config = JSONField()
class Meta:
"""
Contains general permissions that can not be placed in a specific app.
"""
permissions = (
('can_see_projector', ugettext_noop('Can see the projector')),
('can_manage_projector', ugettext_noop('Can manage the projector')),
('can_see_dashboard', ugettext_noop('Can see the dashboard')),
('can_use_chat', ugettext_noop('Can use the chat')))
@property
def projector_elements(self):
"""
A generator to retrieve all projector elements given in the config
field. For every element the method get_data() is called and its
result returned.
"""
elements = {}
for element in ProjectorElement.get_all():
elements[element.name] = element
for config_entry in self.config:
name = config_entry['name']
element = elements.get(name)
data = {'name': name}
if element is None:
data['error'] = _('Projector element does not exist.')
else:
try:
data.update(element.get_data(
projector_object=self,
config_entry=config_entry))
except ProjectorException as e:
data['error'] = str(e)
yield data
@classmethod
def get_all_requirements(cls):
"""
Generator which returns all ProjectorRequirement instances of all
active projector elements.
"""
elements = {}
for element in ProjectorElement.get_all():
elements[element.name] = element
for projector in cls.objects.all():
for config_entry in projector.config:
element = elements.get(config_entry['name'])
if element is not None:
for requirement in element.get_requirements(config_entry):
yield requirement
class CustomSlide(RESTModelMixin, models.Model):
"""
Model for slides with custom content.
"""
title = models.CharField(
verbose_name=ugettext_lazy('Title'),
max_length=256)
text = models.TextField(
verbose_name=ugettext_lazy('Text'),
blank=True)
weight = models.IntegerField(
verbose_name=ugettext_lazy('Weight'),
default=0)
class Meta:
ordering = ('weight', 'title', )
def __str__(self):
return self.title
class Tag(RESTModelMixin, models.Model):
"""
Model for tags. This tags can be used for other models like agenda items,
motions or assignments.
"""
name = models.CharField(
verbose_name=ugettext_lazy('Tag'),
max_length=255,
unique=True)
class Meta:
ordering = ('name',)
permissions = (
('can_manage_tags', ugettext_noop('Can manage tags')), )
def __str__(self):
return self.name