OpenSlides/openslides/motions/serializers.py

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from django.db import transaction
from django.utils.translation import ugettext as _
from openslides.poll.serializers import default_votes_validator
from openslides.utils.rest_api import (
CharField,
DictField,
Field,
IntegerField,
ModelSerializer,
PrimaryKeyRelatedField,
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SerializerMethodField,
ValidationError,
)
from .models import (
Category,
Motion,
MotionLog,
MotionPoll,
MotionVersion,
State,
Workflow,
)
def validate_workflow_field(value):
"""
Validator to ensure that the workflow with the given id exists.
"""
if not Workflow.objects.filter(pk=value).exists():
raise ValidationError({'detail': _('Workflow %(pk)d does not exist.') % {'pk': value}})
class CategorySerializer(ModelSerializer):
"""
Serializer for motion.models.Category objects.
"""
class Meta:
model = Category
fields = ('id', 'name', 'prefix',)
class StateSerializer(ModelSerializer):
"""
Serializer for motion.models.State objects.
"""
class Meta:
model = State
fields = (
'id',
'name',
'action_word',
'recommendation_label',
'css_class',
'required_permission_to_see',
'allow_support',
'allow_create_poll',
'allow_submitter_edit',
'versioning',
'leave_old_version_active',
'dont_set_identifier',
'next_states',
'workflow')
class WorkflowSerializer(ModelSerializer):
"""
Serializer for motion.models.Workflow objects.
"""
states = StateSerializer(many=True, read_only=True)
first_state = PrimaryKeyRelatedField(read_only=True)
class Meta:
model = Workflow
fields = ('id', 'name', 'states', 'first_state',)
class MotionCommentsJSONSerializerField(Field):
"""
Serializer for motions's comments JSONField.
"""
def to_representation(self, obj):
"""
Returns the value of the field.
"""
return obj
def to_internal_value(self, data):
"""
Checks that data is a list of strings.
"""
if type(data) is not list:
raise ValidationError({'detail': 'Data must be an array.'})
for element in data:
if type(element) is not str:
raise ValidationError({'detail': 'Data must be an array of strings.'})
return data
class MotionLogSerializer(ModelSerializer):
"""
Serializer for motion.models.MotionLog objects.
"""
message = SerializerMethodField()
class Meta:
model = MotionLog
fields = ('message_list', 'person', 'time', 'message',)
def get_message(self, obj):
"""
Concats the message parts to one string. Useful for smart template code.
"""
return str(obj)
class MotionPollSerializer(ModelSerializer):
"""
Serializer for motion.models.MotionPoll objects.
"""
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yes = SerializerMethodField()
no = SerializerMethodField()
abstain = SerializerMethodField()
votes = DictField(
child=IntegerField(min_value=-2, allow_null=True),
write_only=True)
has_votes = SerializerMethodField()
class Meta:
model = MotionPoll
fields = (
'id',
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'motion',
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'yes',
'no',
'abstain',
'votesvalid',
'votesinvalid',
'votescast',
'votes',
'has_votes')
validators = (default_votes_validator,)
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def __init__(self, *args, **kwargs):
# The following dictionary is just a cache for several votes.
self._votes_dicts = {}
return super().__init__(*args, **kwargs)
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def get_yes(self, obj):
try:
result = self.get_votes_dict(obj)['Yes']
except KeyError:
result = None
return result
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def get_no(self, obj):
try:
result = self.get_votes_dict(obj)['No']
except KeyError:
result = None
return result
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def get_abstain(self, obj):
try:
result = self.get_votes_dict(obj)['Abstain']
except KeyError:
result = None
return result
def get_votes_dict(self, obj):
try:
votes_dict = self._votes_dicts[obj.pk]
except KeyError:
votes_dict = self._votes_dicts[obj.pk] = {}
for vote in obj.get_votes():
votes_dict[vote.value] = vote.weight
return votes_dict
def get_has_votes(self, obj):
"""
Returns True if this poll has some votes.
"""
return obj.has_votes()
@transaction.atomic
def update(self, instance, validated_data):
"""
Customized update method for polls. To update votes use the write
only field 'votes'.
Example data:
"votes": {"Yes": 10, "No": 4, "Abstain": -2}
"""
# Update votes.
votes = validated_data.get('votes')
if votes:
if len(votes) != len(instance.get_vote_values()):
raise ValidationError({
'detail': _('You have to submit data for %d vote values.') % len(instance.get_vote_values())})
for vote_value, vote_weight in votes.items():
if vote_value not in instance.get_vote_values():
raise ValidationError({
'detail': _('Vote value %s is invalid.') % vote_value})
instance.set_vote_objects_with_values(instance.get_options().get(), votes)
# Update remaining writeable fields.
instance.votesvalid = validated_data.get('votesvalid', instance.votesvalid)
instance.votesinvalid = validated_data.get('votesinvalid', instance.votesinvalid)
instance.votescast = validated_data.get('votescast', instance.votescast)
instance.save()
return instance
class MotionVersionSerializer(ModelSerializer):
"""
Serializer for motion.models.MotionVersion objects.
"""
class Meta:
model = MotionVersion
fields = (
'id',
'version_number',
'creation_time',
'title',
'text',
'reason',)
class MotionSerializer(ModelSerializer):
"""
Serializer for motion.models.Motion objects.
"""
active_version = PrimaryKeyRelatedField(read_only=True)
comments = MotionCommentsJSONSerializerField(required=False)
log_messages = MotionLogSerializer(many=True, read_only=True)
polls = MotionPollSerializer(many=True, read_only=True)
reason = CharField(allow_blank=True, required=False, write_only=True)
text = CharField(write_only=True)
title = CharField(max_length=255, write_only=True)
versions = MotionVersionSerializer(many=True, read_only=True)
workflow_id = IntegerField(
min_value=1,
required=False,
validators=[validate_workflow_field],
write_only=True)
class Meta:
model = Motion
fields = (
'id',
'identifier',
'title',
'text',
'reason',
'versions',
'active_version',
'parent',
'category',
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'origin',
'submitters',
'supporters',
'comments',
'state',
'workflow_id',
'recommendation',
'tags',
'attachments',
'polls',
'agenda_item_id',
'log_messages',)
read_only_fields = ('state', 'recommendation',) # Some other fields are also read_only. See definitions above.
@transaction.atomic
def create(self, validated_data):
"""
Customized method to create a new motion from some data.
"""
motion = Motion()
motion.title = validated_data['title']
motion.text = validated_data['text']
motion.reason = validated_data.get('reason', '')
motion.identifier = validated_data.get('identifier')
motion.category = validated_data.get('category')
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motion.origin = validated_data.get('origin', '')
motion.comments = validated_data.get('comments')
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motion.parent = validated_data.get('parent')
motion.reset_state(validated_data.get('workflow_id'))
motion.save()
if validated_data.get('submitters'):
motion.submitters.add(*validated_data['submitters'])
else:
motion.submitters.add(validated_data['request_user'])
motion.supporters.add(*validated_data.get('supporters', []))
motion.attachments.add(*validated_data.get('attachments', []))
motion.tags.add(*validated_data.get('tags', []))
return motion
@transaction.atomic
def update(self, motion, validated_data):
"""
Customized method to update a motion.
"""
# Identifier, category, origin and comments.
for key in ('identifier', 'category', 'origin', 'comments'):
if key in validated_data.keys():
setattr(motion, key, validated_data[key])
# Workflow.
workflow_id = validated_data.get('workflow_id')
if workflow_id is not None and workflow_id != motion.workflow:
motion.reset_state(workflow_id)
# Decide if a new version is saved to the database.
if (motion.state.versioning and
not validated_data.get('disable_versioning', False)): # TODO
version = motion.get_new_version()
else:
version = motion.get_last_version()
# Title, text, reason.
for key in ('title', 'text', 'reason'):
if key in validated_data.keys():
setattr(version, key, validated_data[key])
motion.save(use_version=version)
# Submitters, supporters, attachments and tags
for key in ('submitters', 'supporters', 'attachments', 'tags'):
if key in validated_data.keys():
attr = getattr(motion, key)
attr.clear()
attr.add(*validated_data[key])
return motion