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# Extensions

The extensions mechanism has been refactored to remove the need to make models know about their related model admin classes. The new module `feincms.extensions` contains mixins and base classes - their purpose is as follows:

class `feincms.extensions.``ExtensionsMixin`

  This mixin provides the `register_extensions` method which is the place where extensions are registered for a certain model. Extensions can be specified in the following ways:

  - Subclasses of `Extension`
  - Dotted Python module paths pointing to a subclass of the aforementioned extension class
  - Dotted Python module paths pointing to a module containing either a class named `Extension` or a function named `register` (for legacy extensions)

class `feincms.extensions.``Extension`

  This is the base class for your own extension. It has the following methods and properties:

  `model`

    The model class.

  `handle_model`(self)

    The method which modifies the Django model class. The model class is available as `self.model`.

  `handle_modeladmin`(self, modeladmin)

    This method receives the model admin instance bound to the model. This method could be called more than once, especially when using more than one admin site.

class `feincms.extensions.``ExtensionModelAdmin`

  This is a model admin subclass which knows about extensions, and lets the extensions do their work modifying the model admin instance after it has been successfully initialized. It has the following methods and properties:

  `initialize_extensions`(self)

    This method is automatically called at the end of initialization and loops through all registered extensions and calls their `handle_modeladmin` method.

  `add_extension_options`(self, *f)

    This is a helper to add fields and fieldsets to a model admin instance. Usage is as follows:

        modeladmin.add_extension_options('field1', 'field2')

    Or:

        modeladmin.add_extension_options(_('Fieldset title'), {
            'fields': ('field1', 'field2'),
            })

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