OpenSlides/openslides/assignments/serializers.py

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from django.db import transaction
from django.utils.translation import ugettext as _
from openslides.utils.rest_api import (
DictField,
IntegerField,
ListField,
ListSerializer,
ModelSerializer,
ValidationError)
from .models import (
models,
Assignment,
AssignmentRelatedUser,
AssignmentOption,
AssignmentPoll,
AssignmentVote)
class AssignmentRelatedUserSerializer(ModelSerializer):
"""
Serializer for assignment.models.AssignmentRelatedUser objects.
"""
class Meta:
model = AssignmentRelatedUser
fields = (
'id',
'user',
'status')
class AssignmentVoteSerializer(ModelSerializer):
"""
Serializer for assignment.models.AssignmentVote objects.
"""
class Meta:
model = AssignmentVote
fields = ('weight', 'value',)
class AssignmentOptionSerializer(ModelSerializer):
"""
Serializer for assignment.models.AssignmentOption objects.
"""
assignmentvote_set = AssignmentVoteSerializer(many=True, read_only=True)
class Meta:
model = AssignmentOption
fields = ('candidate', 'assignmentvote_set',)
class FilterPollListSerializer(ListSerializer):
"""
Customized serializer to filter polls (exclude unpublished).
"""
def to_representation(self, data):
"""
List of object instances -> List of dicts of primitive datatypes.
This method is adapted to filter the data and exclude unpublished polls.
"""
# Dealing with nested relationships, data can be a Manager,
# so, first get a queryset from the Manager if needed
iterable = data.filter(published=True) if isinstance(data, models.Manager) else data
return [self.child.to_representation(item) for item in iterable]
class AssignmentAllPollSerializer(ModelSerializer):
"""
Serializer for assignment.models.AssignmentPoll objects.
Serializes all polls.
"""
assignmentoption_set = AssignmentOptionSerializer(many=True, read_only=True)
votes = ListField(
child=DictField(
child=IntegerField(min_value=-2)),
write_only=True)
class Meta:
model = AssignmentPoll
fields = (
'id',
'yesnoabstain',
'description',
'published',
'assignmentoption_set',
'votesvalid',
'votesinvalid',
'votescast',
'votes',)
read_only_fields = ('yesnoabstain',)
@transaction.atomic
def update(self, instance, validated_data):
"""
Customized update method for polls. To update votes use the write
only field 'votes'.
Example data for a 'yesnoabstain' poll with two candidates:
"votes": [{"Yes": 10, "No": 4, "Abstain": -2},
{"Yes": -1, "No": 0, "Abstain": -2}]
"""
# Update votes.
votes = validated_data.get('votes')
if votes:
options = list(instance.get_options())
if len(votes) != len(options):
raise ValidationError({
'detail': _('You have to submit data for %d candidates.') % len(options)})
for index, option in enumerate(options):
if len(votes[index]) != 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[index].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(option, votes[index])
# Update remaining writeable fields.
instance.description = validated_data.get('description', instance.description)
instance.published = validated_data.get('published', instance.published)
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 AssignmentShortPollSerializer(AssignmentAllPollSerializer):
"""
Serializer for assignment.models.AssignmentPoll objects.
Serializes only short polls.
"""
class Meta:
list_serializer_class = FilterPollListSerializer
model = AssignmentPoll
fields = (
'id',
'yesnoabstain',
'description',
'published',
'assignmentoption_set',
'votesvalid',
'votesinvalid',
'votescast',)
class AssignmentFullSerializer(ModelSerializer):
"""
Serializer for assignment.models.Assignment objects. With all polls.
"""
assignment_related_users = AssignmentRelatedUserSerializer(many=True, read_only=True)
polls = AssignmentAllPollSerializer(many=True, read_only=True)
class Meta:
model = Assignment
fields = (
'id',
'title',
'description',
'open_posts',
'phase',
'assignment_related_users',
'poll_description_default',
'polls',
'tags',)
class AssignmentShortSerializer(AssignmentFullSerializer):
"""
Serializer for assignment.models.Assignment objects. Without unpublished poll.
"""
assignment_related_users = AssignmentRelatedUserSerializer(many=True, read_only=True)
polls = AssignmentShortPollSerializer(many=True, read_only=True)
class Meta:
model = Assignment
fields = (
'id',
'title',
'description',
'open_posts',
'phase',
'assignment_related_users',
'poll_description_default',
'polls',
'tags',)