检索Django rest框架相关字段

Question

Using the django-rest-framework is it possible to retrieve content from a related field. So for example I want to create a genre list which contains all projects within it. This is what I have but I keep on getting the error:

'Genre' object has no attribute 'project_set'

models.py

class Genre(models.Model):
    name = models.CharField(max_length=100, db_index=True)

class Project(models.Model):
    title = models.CharField(max_length=100, unique=True)
    genres = models.ManyToManyField(Genre, related_name='genres')

serializers.py

class GenreSerializer(serializers.ModelSerializer):    
    project_set = serializers.ManyRelatedField()

    class Meta:
        model = Genre
        fields = ('name', 'project_set')

Answer 1

The related name you're using on the Project class is badly named. That related name is how you access the set of projects related to a given genre instance. So you should be using something like related_name='projects' . (As it is you've got it the wrong way around.)

Then make sure that your serializer class matches up with the related name you're using, so in both places project_set should then instead be projects .

(Alternatively you could just remove the related_name='genres' entirely and everything will work as you were expecting, as the default related_name will be 'project_set' .)