Dynamic lookup cache not updating
Each “reverse” operation described in this section has an immediate effect on the database.
Every addition, creation and deletion is immediately and automatically saved to the database.
To create an object, instantiate it using keyword arguments to the model class, then call s for you automatically, behind the scenes.
To span a relationship, just use the field name of related fields across models, separated by double underscores, until you get to the field you want.
This example retrieves all If you are filtering across multiple relationships and one of the intermediate models doesn’t have a value that meets the filter condition, Django will treat it as if there is an empty (all values are In the examples given so far, we have constructed filters that compare the value of a model field with a constant.
These references can then be used in query filters to compare the values of two different fields on the same model instance.
For example, to find a list of all blog entries that have had more comments than pingbacks, we construct an object with a double underscore will introduce any joins needed to access the related object.