Django Serializer from ManyToManyField using through-CodePudding

I'm trying to serialize the User model from Django, including a manyToMany relation I created.

Here are my models:

class CompanyAccount(models.Model):
   id = models.UUIDField(default=uuid.uuid4, unique=True, primary_key=True, editable=False)
   user_ids = models.ManyToManyField(User, through='CompanyUser')

class CompanyUser(models.Model):
   id = models.UUIDField(default=uuid.uuid4, unique=True, primary_key=True, editable=False)
   user_id = models.ForeignKey(User, on_delete=models.CASCADE)
   company_id = models.ForeignKey(CompanyAccount, on_delete=models.CASCADE)
   is_company_admin = models.BooleanField(default=False, null=True)

Now my goal would be to get the company serialized and returned along with any user.

Here are my serializer, but sadly the company is not returned.

class CompanyAccountSerializer(serializers.ModelSerializer):
    address_id = AddressSerializer(many=False)

    class Meta:
        model = CompanyAccount
        fields = '__all__'

class UserSerializer(serializers.ModelSerializer):
    company_id = CompanyAccountSerializer(many=False, read_only=True)

    class Meta:
        model = User
        fields = ['id', 'username', 'email', 'first_name', 'last_name', 'company_id']

Any help is welcome :-)

CodePudding user response：

The default related name of a ManyToManyField is modelname_set, so you can implement this with:

class UserSerializer(serializers.ModelSerializer):
    companyaccount_set = CompanyAccountSerializer(many=True, read_only=True)

    class Meta:
        model = User
        fields = ['id', 'username', 'email', 'first_name', 'last_name', 'companyaccount_set']

If you want to rename the field, you can use:

class UserSerializer(serializers.ModelSerializer):
    accounts = CompanyAccountSerializer(many=True, read_only=True, source='companyaccount_set')

    class Meta:
        model = User
        fields = ['id', 'username', 'email', 'first_name', 'last_name', 'accounts']