Chris Withers wrote:
What's the difference between zope:view, browser:view, browser:page and
browser:viewlet?
It's a mess. Here's the gist:
zope:adapter
Registers an adapter and optionally applies a permission to the
interface that you're adapting to, e.g.::
<adapter
factory="..."
provides="...IFoo"
permission="foo.permission"
/>
will cause the adapter's attributes as specified in IFoo to be
protected with the 'foo.permission' (everything else will not be
accessible).
zope:view
Registers an adapter and optionally applies a permission to all
"allowed_attirbutes" or the "allowed_interface" if the "permission"
parameter is given.
browser:view
Like zope:view, except:
* the request type (second adapted object) defaults to
IBrowserDefaultLayer
* the "permission" always applies to 'publishTraverse',
'browserDefault' and '__call__' attributes, in addition to the
optionally specified "allowed_attributes" or "allowed_interface"
* support sub-pages that will be available as
obj/@@viewname/subpage.
Note: browser:view always creates new classes on the fly.
browser:page
Registers an adapter where the second adapted object defaults to
IBrowserDefaltLayer. Always creates a new class on the fly and
mixes in functionality that makes the adapter a *publishable view*.
browser:viewlet
Registers an adapter for (context, request, view). It's out of
scope here, I think.
I wish we could clean this up some day, but all my earlier attempts to
walk this direction have mostly been shot down because people apparently
hate deprecation warnings.
I'm sick of ZCML and its magic and its inconsistency. The typing and the
pointy brackets I could live with... ME GROK SMASH ZCML.
I'm trying to register an adapter in such a way that I can do the
following in a page template:
<p tal:content="structure someobj/@@render"/>
Which of the myriad flavours of view registration should I be using?
Inherit from BrowserView and use either a simple <adapter /> or a <view
/> or a <browser:view /> directive to register it. Note that this thing
won't be publishable via the URL then (which is probably what you want).
If you want it to be published, inherit from BrowserPage and use
<browser:page />
Also, why, when zope:view is described as a synonym for zope:adapter,
does zope:view support an allowed_attributes attribute, while
zope:adapter does not?
zope:adapter assumes the "provides" interface as the "allowed_interface".
--
http://worldcookery.com -- Professional Zope documentation and training
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