django-cms 代码研究(八)app hooks
app钩子,啥玩意呢?
就是把现有的app,集成到cms的一种手段。
有两种实现方式:
1) 定义cms_app.py,如下:
from cms.app_base import CMSApp from cms.apphook_pool import apphook_pool from django.utils.translation import ugettext_lazy as _ class MyApphook(CMSApp): name = _("My Apphook") urls = ["myapp.urls"] apphook_pool.register(MyApphook)
官方文档查看这里:http://docs.django-cms.org/en/latest/extending_cms/app_integration.html#app-hooks
加载逻辑,通过discover_apps的load(‘cms_app‘)来加载(前提是在settings.py中未定义 CMS_APPHOOKS):在所有的installed_app中,查找cms_app模块,并自动import_module
2) 在setting.py中定义CMS_APPHOOKS
APPHOOKS=( ‘yourmodule.you_object1‘,‘yourmodule.you_object2‘,... )
这是从源码中分析的来的,如下:
C:\Python27\Lib\site-packages\django_cms-3.0.3-py2.7.egg\cms\apphook_pool.py (45~57)
def discover_apps(self): self.apphooks = get_cms_setting(‘APPHOOKS‘) if self.apphooks: for cls in iterload_objects(self.apphooks): try: self.register(cls, discovering_apps=True) except AppAlreadyRegistered: pass else: load(‘cms_app‘) self.discovered = True
iterload_objects,是一个生成器,如下:
def iterload_objects(import_paths): """ Load a list of objects. """ for import_path in import_paths: yield load_object(import_path)
load_object
def load_object(import_path): if ‘.‘ not in import_path: raise TypeError( "‘import_path‘ argument to ‘django_load.core.load_object‘ must " "contain at least one dot." ) module_name, object_name = import_path.rsplit(‘.‘, 1) module = import_module(module_name) return getattr(module, object_name)
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