Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I want to implement an API that will have a business logic in there, a great business logic with data processing as well, what should be used for this case?
I researched a lot and managed to understand a little about routers and urlpatterns but I didn't understand which one about views. Summarizing: on one hand you have the APIViewwhich is the most generic of the three, but also in which you must do almost all business logic 'manually'.
You have the class methods mapping http methods getpostOften you'll be developing endpoints to interact with resources entities, like Users, Products, Orders, etc. One step further is the ModelViewSetwhich is an extension of the ViewSet for when you are working with Django models. Obviously, you can also add your own methods to a ViewSet or customize the behavior of its default methods.
In my experience, it pays off to use ViewSets. The code looks cleaner and you avoid some boilerplate code. The assumptions it makes are reasonable, and I would even say that you probably will end up with a cleaner API design following them. Learn more. Asked 1 year ago. Active 1 year ago. Viewed 2k times. Improve this question. Dedadino Dedadino 45 10 10 bronze badges. Add a comment. Active Oldest Votes.
Improve this answer. I can include a huge business logic with ViewSets? If yes, how? Please look at the first example of the docs: django-rest-framework. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
Post as a guest Name. Email Required, but never shown.Expand Collapse. Don't do that. Store the original class on the view function. This allows us to discover information about the view when we do URL reverse lookups. Used for breadcrumb generation. Main entry point for a request-response process. Check if the request should be permitted for a given object.
Raises an appropriate exception if the request is not permitted. Check if the request should be permitted. Check if request should be throttled. Raises an appropriate exception if the request is throttled. FILES if serializer. Also defer to the error handler if the request method isn't on the approved list. Given a queryset, filter it with whichever filter backend is in use.
Returns the final response object. If a request is unauthenticated, determine the WWW-Authenticate header to use for responses, if any. Instantiates and returns the list of authenticators that this view can use. Instantiate and return the content negotiation class to use.
Django REST Framework: ViewSet, ModelViewSet and Router
Returns the list of filter backends that this view requires. Determine if the request includes a '. Returns the object the view is displaying. You may want to override this if you need to provide non-standard queryset lookups. Eg if objects are referenced using multiple keyword arguments in the url conf. This will either raise a PermissionDenied exception, or simply return None. Return the size of pages to use with pagination.
Return a serializer instance to use with paginated data. Returns a dict that is passed through to Parser.They take certain common idioms and patterns found in view development and abstract them so that you can quickly write common views of data without having to repeat yourself.
One of the key benefits of class-based views is the way they allow you to compose bits of reusable behavior. REST framework takes advantage of this by providing a number of pre-built views that provide for commonly used patterns.
If the generic views don't suit the needs of your API, you can drop down to using the regular APIView class, or reuse the mixins and base classes used by the generic views to compose your own set of reusable generic views. Typically when using the generic views, you'll override the view, and set several class attributes. For more complex cases you might also want to override various methods on the view class.Wickelfalzrohr reduzierung muffe
For example. For very simple cases you might want to pass through any class attributes using the. For example, your URLconf might include something like the following entry:. Each of the concrete generic views provided is built by combining GenericAPIViewwith one or more mixin classes.
Returns the queryset that should be used for list views, and that should be used as the base for lookups in detail views. Defaults to returning the queryset specified by the queryset attribute.
This method should always be used rather than accessing self. May be overridden to provide dynamic behavior, such as returning a queryset, that is specific to the user making the request. Returns an object instance that should be used for detail views.
May be overridden to provide more complex behavior, such as object lookups based on more than one URL kwarg. Note that if your API doesn't include any object level permissions, you may optionally exclude the self. Returns the class that should be used for the serializer. May be overridden to provide dynamic behavior, such as using different serializers for read and write operations, or providing different serializers to different types of users. The following methods are provided by the mixin classes, and provide easy overriding of the object save or deletion behavior.
These hooks are particularly useful for setting attributes that are implicit in the request, but are not part of the request data. For instance, you might set an attribute on the object based on the request user, or based on a URL keyword argument.
These override points are also particularly useful for adding behavior that occurs before or after saving an object, such as emailing a confirmation, or logging the update. You can also use these hooks to provide additional validation, by raising a ValidationError. This can be useful if you need some validation logic to apply at the point of database save.
For example:. You won't typically need to override the following methods, although you might need to call into them if you're writing custom views using GenericAPIView. The mixin classes provide the actions that are used to provide the basic view behavior. Note that the mixin classes provide action methods rather than defining the handler methods, such as.
This allows for more flexible composition of behavior. Provides a. If the queryset is populated, this returns a OK response, with a serialized representation of the queryset as the body of the response. The response data may optionally be paginated. If an object is created this returns a Created response, with a serialized representation of the object as the body of the response.
If the representation contains a key named urlthen the Location header of the response will be populated with that value. If the request data provided for creating the object was invalid, a Bad Request response will be returned, with the error details as the body of the response.
If an object can be retrieved this returns a OK response, with a serialized representation of the object as the body of the response.Expand Collapse. Don't do that. Store the original class on the view function. This allows us to discover information about the view when we do URL reverse lookups. Used for breadcrumb generation. Main entry point for a request-response process. Check if the request should be permitted for a given object.
Raises an appropriate exception if the request is not permitted. Check if the request should be permitted. Check if request should be throttled. Raises an appropriate exception if the request is throttled. If versioning is being used, then determine any API version for the incoming request. Also defer to the error handler if the request method isn't on the approved list. Given a queryset, filter it with whichever filter backend is in use.
Returns the final response object. If a request is unauthenticated, determine the WWW-Authenticate header to use for responses, if any. Instantiates and returns the list of authenticators that this view can use. Instantiate and return the content negotiation class to use. Determine if the request includes a '. Returns the object the view is displaying.
You may want to override this if you need to provide non-standard queryset lookups. Eg if objects are referenced using multiple keyword arguments in the url conf. Returns a dict that is passed through to Parser. Instantiates and returns the list of parsers that this view can use.
Instantiates and returns the list of permissions that this view requires.At the same time we will take a look at the concepts of Routers which allow us to manage our api routes in a cleaner fashion. So far we have learned how we can use the generic views. It works very well but we need to write at least two different classes to handle them properly. ViewSet s come to the rescue. We need to think more along the actions we can take on the entity Subscriber as a whole. Well, we can!Django Rest CRUD API - Serializer \u0026 Generic views - GET, POST, PUT \u0026 DELETE - Django CRUD API
Well, we have to declare those paths ourselves. At the same time, if we need, we can just override one of those methods list, retrieve, create etc to alter the default behavior with our own.
What is the difference in use or inherit from APIView and Model ViewSet
The next stop would be securing it. In our next post, we will be discussing Authentication and Permissions. In the mean time, I would request you to subscribe to the mailing list so I can keep you posted about new exciting contents on this site.
If you liked the post, please do share with your friends! Very nice tutorial. I have an additional question. I am trying to write a test for this part of the tutorial. This works in Django fine when i hit this in postman. Your email address will not be published.
Understanding ViewSet So far we have learned how we can use the generic views. Pingback: Polyglot.Is ziip beauty worth it
Hi, Very nice tutorial. Depends on your use case. I like to use ViewSets as much as I can. Leave a Reply Cancel reply Your email address will not be published.After routing has determined which controller to use for a request, your controller is responsible for making sense of the request and producing the appropriate output. In other frameworks you may also find conceptually similar implementations named something like 'Resources' or 'Controllers'. A ViewSet class is simply a type of class-based View, that does not provide any method handlers such as.
The method handlers for a ViewSet are only bound to the corresponding actions at the point of finalizing the view, using the. Typically, rather than explicitly registering the views in a viewset in the urlconf, you'll register the viewset with a router class, that automatically determines the urlconf for you. Typically we wouldn't do this, but would instead register the viewset with a router, and allow the urlconf to be automatically generated.
Rather than writing your own viewsets, you'll often want to use the existing base classes that provide a default set of behavior. For example:. There are two main advantages of using a ViewSet class over using a View class. Both of these come with a trade-off.
Using regular views and URL confs is more explicit and gives you more control. ViewSets are helpful if you want to get up and running quickly, or when you have a large API and you want to enforce a consistent URL configuration throughout.
You may inspect these attributes to adjust behaviour based on the current action. For example, you could restrict permissions to everything except the list action similar to this:.
If you have ad-hoc methods that should be routable, you can mark them as such with the action decorator. Like regular actions, extra actions may be intended for either a single object, or an entire collection. To indicate this, set the detail argument to True or False.
The router will configure its URL patterns accordingly. Note that additional mappings do not accept arguments. If you need to get the URL of an action, use the.
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Note that the basename is provided by the router during ViewSet registration. If you are not using a router, then you must provide the basename argument to the. Additionally, this method can be used to reverse the default actions, such as list and create.
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Up Next Bad case of corporate indigestion Play Video Don't Play Video duration00:57 Bad case of corporate indigestion Retail Food Group has been expanding for years, buying one retail food chain after another across Australia. Up Next ASX winners and losers - a snapshot Play Video Don't Play Video duration00:43 ASX winners and losers - a snapshot The stand out listings traded on the ASX captured at key moments through the day, as indicated by the time stamp in the video.
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