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But how is this possible, given that a model class doesn’t know which other model classes are related to it until those other model classes are loaded?The answer lies in the module inside each application.For example, to retrieve all the entries where the author’s name is the same as the blog name, we could issue the query: statement, the percent sign signifies a multiple-character wildcard and the underscore signifies a single-character wildcard.) This means things should work intuitively, so the abstraction doesn’t leak.For example, to retrieve all the entries that contain a percent sign, just use the percent sign as any other character: method is applied instantly and returns the number of rows matched by the query (which may not be equal to the number of rows updated if some rows already have the new value).

The API works just as a “backward” one-to-many relationship, above.Finally, it’s important to note that the Django database layer is merely an interface to your database.You can access your database via other tools, programming languages or database frameworks; there’s nothing Django-specific about your database.For this reason, it’s particularly important that all the models you’re using be defined in applications listed in Queries involving related objects follow the same rules as queries involving normal value fields.When specifying the value for a query to match, you may use either an object instance itself, or the primary key value for the object.

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