Drf – Dealing With Nested Objects With Code Examples

Drf – Dealing With Nested Objects With Code Examples

With this text, we’ll study a number of completely different situations of how you can resolve the Drf – Dealing With Nested Objects downside.

#for Model serializers
class AccountSerializer(serializers.ModelSerializer):
    class Meta:
        mannequin = Account
        fields = ['id', 'account_name', 'users', 'created']
        depth = 1 #generate nested representations utilizing the depth possibility

# getting mannequin strategies
class AccountSerializer(serializers.ModelSerializer):
    abs_url = serializers.CharField(supply="get_absolute_url", read_only=True)
    teams = serializers.PrimaryKeyRelatedField(many=True)

    class Meta:
        mannequin = Account
        fields = ['url','abs_url','groups']


#The Serializer class is itself a kind of Field, and can be utilized to signify relationships the place one object sort is nested inside one other.
class UserSerializer(serializers.Serializer):
    e mail = serializers.Electronic mailField()
    username = serializers.CharField(max_length=100)

class RemarkSerializer(serializers.Serializer):
    consumer = UserSerializer(required=False)  # May be an nameless consumer.
    edits = EditItemSerializer(many=True) # A nested listing of 'edit' objects.
    content material = serializers.CharField(max_length=200)
    created = serializers.DateTimeField()

#for nested representations you may want to jot down .create() or .replace() strategies that deal with saving a number of objects.
class UserSerializer(serializers.ModelSerializer):
    profile = ProfileSerializer()

    class Meta:
        mannequin = User
        fields = ['username', 'email', 'profile']

    def create(self, validated_data):
        profile_data = validated_data.pop('profile')
        consumer = User.objects.create(**validated_data)
        Profile.objects.create(consumer=consumer, **profile_data)
        return consumer
    def replace(self, occasion, validated_data):
        profile_data = validated_data.pop('profile')
        # Unless the applying correctly enforces that this area is
        # all the time set, the next may increase a `DoesNotExist`, which
        # would have to be dealt with.
        profile = occasion.profile

        occasion.username = validated_data.get('username', occasion.username)
        occasion.e mail = validated_data.get('e mail', occasion.e mail)
        occasion.save()

        profile.is_premium_member = profile_data.get(
            'is_premium_member',
            profile.is_premium_member
        )
        profile.has_support_contract = profile_data.get(
            'has_support_contract',
            profile.has_support_contract
         )
        profile.save()

        return occasion
        
#

We have seen how you can resolve the Drf – Dealing With Nested Objects with numerous examples.

What is using nested serializer?

In normal, I exploit nested serializers after I need an interface the place mannequin B is all the time learn (or created) along with mannequin A. An instance of this is able to be a Pizza mannequin with a many-to-many relationship to Topping .21-Jan-2022

What is nested serializer in Django REST framework?

DRF offers a Serializer class that provides you a robust, generic option to management the output of your responses, in addition to a ModelSerializer class that gives a helpful shortcut for creating serializers that cope with mannequin situations and querysets.

What is To_representation in Django?

to_representation(self, worth) technique. This technique takes the goal of the sector as the worth argument, and may return the illustration that must be used to serialize the goal. The worth argument will sometimes be a mannequin occasion.

What is the distinction between Django and DRF?

Django is the net growth framework in python whereas the Django Rest Framework is the library utilized in Django to construct Rest APIs. Django Rest Framework is particularly designed to make the CRUD operations simpler to design in Django.22-Jun-2021

Why serializers are utilized in Django?

Serializers in Django REST Framework are accountable for changing objects into information varieties comprehensible by javascript and front-end frameworks. Serializers additionally present deserialization, permitting parsed information to be transformed again into advanced varieties, after first validating the incoming information.10-Sept-2021

What is Slug associated area in Django?

SlugField in Django is sort of a CharField, the place you’ll be able to specify max_length attribute additionally. If max_length isn’t specified, Django will use a default size of fifty. It additionally implies setting Field.12-Feb-2020

In operate based mostly views we are able to cross further context to serializer with “context” parameter with a dictionary. To entry the additional context information contained in the serializer we are able to merely entry it with “self. context”. From instance, to get “exclude_email_list” we simply used code ‘exclude_email_list = self.05-Oct-2017

How do I cross Queryset to serializer?

To serialize a queryset or listing of objects as a substitute of a single object occasion, it’s best to cross the various=True flag when instantiating the serializer. You can then cross a queryset or listing of objects to be serialized.

What is Related_name in Django?

The related_name attribute specifies the identify of the reverse relation from the User mannequin again to your mannequin. If you do not specify a related_name, Django mechanically creates one utilizing the identify of your mannequin with the suffix _set. Syntax: field_name = fashions.Field(related_name=”identify”)01-Nov-2020

What is HyperlinkedModelSerializer?

HyperlinkedModelSerializer is a layer of abstraction over the default serializer that enables to shortly create a serializer for a mannequin in Django. Django REST Framework is a wrapper over default Django Framework, mainly used to create APIs of assorted varieties.20-Jul-2020