53 строки
2.0 KiB
Python
53 строки
2.0 KiB
Python
from rest_framework import relations, serializers
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import amo
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import mkt.carriers
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import mkt.regions
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from addons.models import Category
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from mkt.api.fields import SplitField
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from mkt.api.serializers import URLSerializerMixin
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from mkt.collections.serializers import (CollectionSerializer, SlugChoiceField,
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SlugModelChoiceField)
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from .models import FeedItem
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class FeedItemSerializer(URLSerializerMixin, serializers.ModelSerializer):
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carrier = SlugChoiceField(required=False,
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choices_dict=mkt.carriers.CARRIER_MAP)
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region = SlugChoiceField(required=False,
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choices_dict=mkt.regions.REGIONS_DICT)
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category = SlugModelChoiceField(required=False,
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queryset=Category.objects.filter(type=amo.ADDON_WEBAPP))
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item_type = serializers.SerializerMethodField('get_item_type')
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# Types of objects that are allowed to be a feed item.
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collection = SplitField(relations.PrimaryKeyRelatedField(required=False),
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CollectionSerializer())
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class Meta:
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fields = ('carrier', 'category', 'collection', 'id', 'item_type',
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'region', 'url')
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item_types = ('collection',)
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model = FeedItem
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url_basename = 'feeditem'
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def validate(self, attrs):
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"""
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Ensure that at least one object type is specified.
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"""
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item_changed = any(k for k in self.Meta.item_types if k in attrs.keys())
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num_defined = sum(1 for item in self.Meta.item_types if attrs.get(item))
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if item_changed and num_defined != 1:
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message = ('A valid value for exactly one of the following '
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'parameters must be defined: %s' % ','.join(
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self.Meta.item_types))
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raise serializers.ValidationError(message)
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return attrs
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def get_item_type(self, obj):
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for item_type in self.Meta.item_types:
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if getattr(obj, item_type):
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return item_type
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return
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