Or, more succinctly, you can decorate the class instead and pass the name of the method to be decorated as the keyword argument name :. These two classes are equivalent:. The decorators will process a request in the order they are passed to the decorator.
In this example, every instance of ProtectedView will have login protection. If your method does not accept a compatible set of parameters it will raise a TypeError exception. Offline Django 3. Django is a registered trademark of the Django Software Foundation. Django The web framework for perfectionists with deadlines. Documentation Search: Search. Getting Help el es fr id it ja ko pl pt-br zh-hans Language: en 1. Object oriented techniques such as mixins multiple inheritance can be used to factor code into reusable components.
POST if form. This approach can be useful if you want to use the same view for multiple resources, and pass data to configure its behavior in each case. Note: Both named captured patterns and dictionary options are passed to the view as named arguments. If you use the same name for both a capture pattern and a dictionary key, then the dictionary option will be used. Within the template you can access the book's details with the template variable named object OR book i.
If you need to, you can change the template used and the name of the context object used to reference the book in the template. You can also override methods to, for example, add additional information to the context. If a requested record does not exist then the generic class-based detail view will raise an Http exception for you automatically — in production, this will automatically display an appropriate "resource not found" page, which you can customise if desired.
Just to give you some idea of how this works, the code fragment below demonstrates how you would implement the class-based view as a function if you were not using the generic class-based detail view. The view first tries to get the specific book record from the model. If this fails the view should raise an Http exception to indicate that the book is "not found". The final step is then, as usual, to call render with the template name and the book data in the context parameter as a dictionary.
As discussed above, this is the default template file name expected by the generic class-based detail view for a model named Book in an application named catalog. Note: The author link in the template above has an empty URL because we've not yet created an author detail page to link to. Once the detail page exists we can get its URL with either of these two approaches:. The first interesting thing we haven't seen before is the function book. This method is "automagically" constructed by Django in order to return the set of BookInstance records associated with a particular Book.
This method is needed because you declare a ForeignKey one-to many field in only the "one" side of the relationship the BookInstance. Since you don't do anything to declare the relationship in the other "many" models, it the Book doesn't have any field to get the set of associated records.
To overcome this problem, Django constructs an appropriately named "reverse lookup" function that you can use. Note: Here we use all to get all records the default. While you can use the filter method to get a subset of records in code, you can't do this directly in templates because you can't specify arguments to functions. Beware also that if you don't define an order on your class-based view or model , you will also see errors from the development server like this one:.
Without it, it can't be sure the records being returned are actually in the right order! This tutorial hasn't covered Pagination yet! If you decide to go with a class Meta for the Author model probably not as flexible as customizing the class-based view, but easy enough , you will end up with something like this:.
Of course, this will not be necessary here we are probably getting ahead of ourselves with so few books and users , but it is something worth keeping in mind for future projects. The second interesting and non-obvious thing in the template is where we set a class text-success , text-danger , text-warning to color-code the human readable status text for each book instance "available", "maintenance", etc.
Astute readers will note that the method BookInstance. This function is automatically created because BookInstance. At this point, we should have created everything needed to display both the book list and book detail pages. Run the server python3 manage. Warning: Don't click any author or author detail links yet — you'll create those in the challenge! Then click a link to one of your books. If everything is set up correctly, you should see something like the following screenshot.
If you've just got a few records, our book list page will look fine. We can also add the publisher into the context at the same time, so we can use it in the template:. The URLconf here uses the named group pk - this name is the default name that DetailView uses to find the value of the primary key used to filter the queryset.
Offline Django 3. Django is a registered trademark of the Django Software Foundation. Django The web framework for perfectionists with deadlines. Documentation Search: Search. Getting Help el es fr id it ja ko pl pt-br zh-hans Language: en 1.
Django ships with generic views to do the following: Display list and detail pages for a single object. If we were creating an application to manage conferences then a TalkListView and a RegisteredUserListView would be examples of list views. Allow users to create, update, and delete objects — with or without authorization. The default implementation adds the object being displayed to the template, but you can override it to send more: from django.
However, the model argument is not the only way to specify the objects that the view will operate upon — you can also specify the list of objects using the queryset argument: from django. Class-based views API reference.
For introductory material, see the Class-based views topic guide. Each request served by a class-based view has an independent state; therefore, it is safe to store state variables on the instance i. Arguments passed to a view are shared between every instance of a view.
If you do and the shared object is modified, the actions of one user visiting your view could have an effect on subsequent users visiting the same view.
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