Adding another field into REST API that from another model

Question

I've created a REST API that populate data from Model_A. but now I need to add another data field into the API that coming from another model. How can I add the parent field from the ModelParent into my API and the parent field also has to be associated properly with Model_A project for example below is an example I'm trying to do but not working (NOTE: model.py are not allowed to be altered in anyway) :

API :

class ReportAPI(APIView):
    def get(self, request):
        project_data = []
        all_projects = Model_A.objects.all()
        for project in all_projects:
            project_data.append(project)
            project_parent = ModelParent.objects.filter(project=project.id)
            for parent in project_parent:
                project_data.append(parent)
        project_serializer = SerializerA(all_projects, many=True)
        return Response(project_serializer.data)

Rest of the required code :

Model :

class Model_A(models.Model):
    project_name = models.CharField(max_length=50, unique=True)
    project_type = models.CharField(max_length=50, choices=p_type)

class ModelParent(models.Model):
    project = models.ForeignKey('Model_A', on_delete=models.CASCADE, related_name='+')
    parent = models.ForeignKey('ModelParent', on_delete=models.SET(''), related_name='+', null=True, blank=True)

Serializer :

class SerializerA(serializers.ModelSerializer):
    class Meta:
        model = Model_A
        fields = ('id', 'project_name','project_type')
        depth = 1

Current output of my API

[
    {
        "id": 1,
        "project_name": "Project A",
        "project_type": "advertisement",
    }
]

Desired Output :

[
    {
        "id": 1,
        "project_name": "Project A",
        "project_type": "advertisement",
        "parent_list": [
                        {
                         id : "1",
                         parent : "Parent 1",
                        },
                        {
                         id : "2",
                         parent : "Parent 2",
                        },
                       ]
    }
]

Any help is much appreciated thanks!

Maulik Patel · Accepted Answer · 2017-12-26 09:49:30Z

1

The Corresponding Model would be as follows: :

class ModelParent(models.Model):
    project = models.ForeignKey('Model_A', on_delete=models.CASCADE, related_name='project')
    parent = models.ForeignKey('ProjectContent', on_delete=models.SET(''), related_name='project_parent', null=True, blank=True)

Serializer would be as follows:

class ModelParentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Model_A
        fields = ('id', 'parent')


class SerializerA(serializers.ModelSerializer):
    parent_list = serializers.SerializerMethodField()

    class Meta:
        model = Model_A
        fields = ('id', 'project_name','project_type', 'parent_list')
        depth = 1

    def get_parent_list(self, obj):
        return ModelParentSerializer(obj.project, many=True).data #project is related name of project field

answered Dec 26, 2017 at 9:49

Maulik Patel

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1 Comment

M.Izzat Over a year ago

Hi @Maulik thanks thanks for your input, my apologies i should've mention that I can't tempered with the model in anyway at all. nevertheless i''ll still try to implement your code tqvm

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