Related objects
When you define a relationship in a model (that is, a ForeignKey, OneToOneField, or ManyToManyField), instances of that model will have a convenient API to access the related object(s).
Using the models at the top of this page, for example, an Entry object e can get its associated Blog object by accessing the blog attribute: e.blog.
(Behind the scenes, this functionality is implemented by Python descriptors. This shouldn't really matter to you, but I point it out here for the curious.)
Django also creates API accessors for the other side of the relationship-the link from the related model to the model that defines the relationship. For example, a Blog object b has access to a list of all related Entry objects via the entry_set attribute: ...
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