X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=docs%2Fsource%2Fpluginwriter%2Fapi.rst;h=0d5c82d81ebff9f53bbbed654e42106c12859824;hb=b312d2cd83dbbfb32adc30c5eb3a9a4cc6ae9295;hp=df93351142710b9fdd1fcc69dccca3a57a36b3b5;hpb=058226d0d2d877715b263fd441deb01821f1f59a;p=mediagoblin.git diff --git a/docs/source/pluginwriter/api.rst b/docs/source/pluginwriter/api.rst index df933511..0d5c82d8 100644 --- a/docs/source/pluginwriter/api.rst +++ b/docs/source/pluginwriter/api.rst @@ -48,3 +48,65 @@ example might look like:: This means that when people enable your plugin in their config you'll be able to provide defaults as well as type validation. + +Context Hooks +------------- + +View specific hooks ++++++++++++++++++++ + +You can hook up to almost any template called by any specific view +fairly easily. As long as the view directly or indirectly uses the +method ``render_to_response`` you can access the context via a hook +that has a key in the format of the tuple:: + + (view_symbolic_name, view_template_path) + +Where the "view symbolic name" is the same parameter used in +``request.urlgen()`` to look up the test. So say we're wanting to add +something to the context of the user's homepage. We look in +mediagoblin/user_pages/routing.py and see:: + + add_route('mediagoblin.user_pages.user_home', + '/u//', + 'mediagoblin.user_pages.views:user_home') + +Aha! That means that the name is ``mediagoblin.user_pages.user_home``. +Okay, so then we look at the view at the +``mediagoblin.user_pages.views:user_home`` method:: + + @uses_pagination + def user_home(request, page): + # [...] whole bunch of stuff here + return render_to_response( + request, + 'mediagoblin/user_pages/user.html', + {'user': user, + 'user_gallery_url': user_gallery_url, + 'media_entries': media_entries, + 'pagination': pagination}) + +Nice! So the template appears to be +``mediagoblin/user_pages/user.html``. Cool, that means that the key +is:: + + ("mediagoblin.user_pages.views:user_home", + "mediagoblin/user_pages/user.html") + +The context hook uses ``hook_transform()`` so that means that if we're +hooking into it, our hook will both accept one argument, ``context``, +and should return that modified object, like so:: + + def add_to_user_home_context(context): + context['foo'] = 'bar' + return context + + hooks = { + ("mediagoblin.user_pages.views:user_home", + "mediagoblin/user_pages/user.html"): add_to_user_home_context} + + +Global context hook ++++++++++++++++++++ + +