I have two models (Like and News). I am using django-rest-framework to make
a web api out of it.
class Like(models.Model):
user = models.ForeignKey(User)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey('content_type', 'object_id')
class News(models.Model):
user = models.ForeignKey(User)
title = models.CharField(max_length=150)
...
likes = GenericRelation(Like)
A *Like object* has its own user field to store who liked the News object.
Now to check if a specific user exists in any of the likes of a News
object, I am getting request.user from a SerializerMethodField.
class NewsSerializer(serializers.HyperlinkedModelSerializer):
user = UserSerializer()
likes_count = serializers.IntegerField(source='likes.count', read_only=
True)
user_in_likes = serializers.SerializerMethodField()
class Meta:
model = News
fields = ('user', 'title', 'body', 'article_image', 'pub_date',
'likes_count', 'user_in_likes')
def get_user_in_likes(self, obj):
user = self.context['request'].user
what = obj.likes.filter(user=user).exists()
return what
When I go the /news/ url, I get the json objects including the
*user_in_likes* to true/false for each news object.
However, I have another serialzer for different model which imports
*NewsSerializer
class* and other similar serializers:
class ActivityObjectRelatedField(serializers.RelatedField):
def to_representation(self, value):
if isinstance(value, User):
serializer = UserSerializer(value)
elif isinstance(value, Job):
serializer = JobSerializer(value)
elif isinstance(value, News):
serializer = NewsSerializer(value)
elif isinstance(value, Tender):
serializer = TenderSerializer(value)
else:
raise Exception('Unexpected type of tagged object')
return serializer.data
class ActivitySerializer(serializers.HyperlinkedModelSerializer):
actor = ActivityObjectRelatedField(read_only=True)
target = ActivityObjectRelatedField(read_only=True)
class Meta:
model = Activity
fields = ('url', 'actor', 'verb', 'target', 'pub_date')
Now if I visit */activities/*, to get the activities objects I am getting
an error:
KeyError at /activities/
'request'
And it points to the line of SerializerMethod of NewsSerialize class where
*self.context['request'].user* is used.
Exception Location: /vagrant/myproject/news/serializers.py in
get_user_in_likes, line 25
Again if I visit */news/* url, everything is fine and I get news objects.
What am I missing here? Why is *request* not being recognized in the
*ActivitiesSerializer
class*? Please help me solve this problem. Thank you.
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