We have defined a related_name= addresses for the User Foreign Key in the Address it can be used in the fields meta option. The relationship between User and Address is a reverse relationship and needs to be explicitly added in the fields. Forward model relationships are automatically included in the fields returned by the ModelSerializer. We need to return the user details along with their address detail, as given below. We have a User model, which contains data about the customer and Address that has the list of addresses added. To better understand this, take the following example. Handling Reverse Relationships in Serializers Thanks to DRF, we can cleanly and easily customize the context data.Ģ. In case of generic view and viewsets, the serializer initialization is handled by the framework and passed the following as default context. To pass the context to the serializer, create a dictionary with the data and pass it in the context parameter when initializing the serializer. Passing custom context data to the serializer The context data can be accessed using ntext in serializer validation methods or any other serializer method. The serializer takes the context parameter in the form of a python dictionary, and this data is available throughout the serializer methods. Next is the role of the serializer’s context data. Our validation logic may sometimes need some extra information that must be taken from the database or derived from the view calling the serializer. One is the self or the serializer object, and the other is the field value received in the request payload. The validation method takes two parameters. Let us consider a case when we need to write some complex validation logic in the serializer. Using Serializer Context to Pass Data from View to Serializer Let’s explore Django REST Framework’s (DRF) lesser-known but useful features:ġ. If you need help in building the basics, here is the list of resources from official documentation. We will not be covering the basic concepts like serializers, API view/viewsets, generic views, permissions, etc. To understand the things discussed in the blog, the reader should have some prior experience of creating REST APIs using DRF. DJANGO REST FRAMEWORK MIXINS CODE
This will help you to write cleaner code and improve API performance. Using Mixin to enable/disable pagination with Query Param.SerializerMethodField to add read-only derived data to the response.
Solving slow queries by eliminating the N+1 query problem.Handling reverse relationships in serializers.Using serializer context to pass data from view to serializer.We will be covering the following use cases: In this blog post, I will share some of the features that I have used extensively while working with DRF. Once we start creating production-level APIs, we must do a lot of customization that are highly supported by DRF. With minimal effort and time, you can start creating APIs that support authentication, authorization, pagination, sorting, etc. Django REST Framework (DRF) is a popular library choice when it comes to creating REST APIs with Django. view_initkwargs = initkwargs # take name and docstring from class update_wrapper ( view, cls, updated = ()) # and possible attributes set by decorators # like csrf_exempt from dispatch update_wrapper ( view, cls.
dispatch ( request, * args, ** kwargs ) view. _name_, key )) def view ( request, * args, ** kwargs ): self = cls ( ** initkwargs ) if hasattr ( self, 'get' ) and not hasattr ( self, 'head' ): self. as_view " "only accepts arguments that are already " "attributes of the class." % ( cls. _name_ )) if not hasattr ( cls, key ): raise TypeError ( " %s () received an invalid keyword %r. http_method_names : raise TypeError ( "You tried to pass in the %s method name as a " "keyword argument to %s (). """ for key in initkwargs : if key in cls. Versioning_class = def as_view ( cls, ** initkwargs ): """ Main entry point for a request-response process.
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