CODEWITHSUNDEEP
djangodjango-rest-framework
user3193620
user3193620

Reputation: 181

Django rest - rearrange the nested structure

Does django-rest framework support rearrange of models structure? I'm using the following set of models:

class Blog(models.Model):
    name = models.CharField(max_length=255)
    posts = models.ForeignKey(
        "posts.PostsSnapshot",
        on_delete=models.SET_NULL,
        null=True,
        blank=True
    )

class PostsSnapshot(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)

class Post(models.Model):
    snapshot = models.ForeignKey(PostsSnapshot, on_delete=models.CASCADE, related_name='posts')
    title = models.CharField(max_length=255)
    content = models.TextField()

And I'm relying on ModelSerializer to provide REST access to this data:

class BlogSerializer(serializers.ModelSerializer):
    posts = PostsSerializer()

    class Meta:
        model = Blog
        fields = '__all__'
        depth = 2


class PostSerializer(serializers.ModelSerializer):
    class Meta:
        model = Post
        fields = ['title', 'content']


class PostsSerializer(serializers.ModelSerializer):
    posts = PostsSerializer(many=True)

    class Meta:
        model = PostsSnapshot
        fields = ['created_at', 'posts']
        depth = 2

And due to that, I've got "too" nested JSON response:

   "posts": {
            "created_at": "2021-06-13T11:53:29.345951Z",
            "posts": [
                   ...
            ]

Is it possible to move the nested post data one level up? I'd like to replace the PostsSnapshotSerializer data with PostsSerializer data (but they have to be limited to this single snapshot).

Upvotes: 0

Views: 109

Answers (1)

Klim Bim
Klim Bim

Reputation: 646

If you want to have a different/custom representation of your data than you have to override to_representation(). depth always provides nested data of your current object-data. Meta doesn´t have a feature to level Post and PostsSnapshot at your Blog-representation.

Here you can find an example.

Example

class PostsSerializer(serializers.ModelSerializer):
    posts = PostsSerializer(many=True)

    class Meta:
        model = PostsSnapshot
        fields = ['created_at', 'posts']

    def to_representation(self, data)
       # make your custom representation
       data['key'] = custom_values
       return data

Upvotes: 1

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