Reverse Many-to-Many relation in Django REST Framework

Question

How can I create reverse field in Django REST framework for both many-to-many related objects serializers?

**Models**

class Tag(models.Model):
    name = models.CharField(max_length=500, blank=True)

class Event(models.Model):
    max_attendee = models.IntegerField(default=0)
    description = models.TextField(blank=True)
    tags = models.ManyToManyField(Tag, related_name='events_tags')


** Serializers **

class EventSerializer(serializers.HyperlinkedModelSerializer):
    tags = serializers.HyperlinkedRelatedField(many=True, view_name='tag-detail')

    class Meta:
        model = Event
        fields = ('id', 'location', 'location_name', 'date', 'max_attendee', 'description', 'image', 'created_by', 'tags')

class TagSerializer(serializers.HyperlinkedModelSerializer):
    events = serializers.HyperlinkedRelatedField(many=True, view_name='event-detail')

    class Meta:
        model = Tag
        fields = ('name',)

Because there is no events field in Tags model, I cannot display events related to tags. However, reverse performs great because Many-to-Many relation is set in Events model.

score 0 · Answer 1 · answered Aug 18 '14 at 20:26

0

Have you tried using the field's related name?

class TagSerializer(serializers.HyperlinkedModelSerializer):
    events_tags = serializers.HyperlinkedRelatedField(many=True, view_name='event-detail')

    class Meta:
        model = Tag
        fields = ('name', 'events_tags',)

answered Aug 18 '14 at 20:26

mariodev

13,928
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Yes but it gives error as "'ManyRelatedManager' object is not iterable" – brsbilgic Aug 18 '14 at 20:33
http://stackoverflow.com/questions/17256724/include-intermediary-through-model-in-responses-in-django-rest-framework – brsbilgic Aug 18 '14 at 20:56

score 0 · Answer 2 · answered Aug 19 '14 at 09:04

0

Try changing this:

events = serializers.HyperlinkedRelatedField(many=True, view_name='event-detail')

to this:

events_tags = serializers.RelatedField()

answered Aug 19 '14 at 09:04

AdelaN

3,366
2
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Reverse Many-to-Many relation in Django REST Framework

2 Answers2