dolmen.app.container 0.4

Containers tools for Dolmen applications

dolmen.app.container is a collection of tools to work with containers in Dolmen applications.

Getting started

We import the Grok, request and authentication tools, in order to use them in our tests:

>>> from grok import testing
>>> from zope.component import getMultiAdapter
>>> from zope.publisher.browser import TestRequest
>>> from zope.security.testing import Principal, Participation
>>> from zope.security.management import newInteraction, endInteraction

Namechooser

In order to get a consistent policy concerning the container keys, dolmen.app.container provides a INameChooser adapter, for the dolmen.content.IContainer objects.

We create our container type:

>>> import dolmen.content

>>> class Folder(dolmen.content.Container):
...   dolmen.content.name('a folderish content')
...   dolmen.content.require('dolmen.content.Add')

>>> testing.grok_component('folder', Folder)
True

>>> root = getSite()
>>> folder = Folder()
>>> root['folder'] = folder

We now create a simple content type:

>>> from zope.interface import Interface, implements

>>> class IDocument(Interface):
...   pass

>>> class Document(dolmen.content.Content):
...   dolmen.content.name('a document')
...   implements(IDocument)

>>> testing.grok_component('doc', Document)
True

>>> manfred = Document()
>>> manfred.__content_type__
'a document'
>>> manfred.title = u"Manfred"

To use the namechooser, we simply adapt our container to the INameChooser interfaces:

>>> from zope.container.interfaces import INameChooser
>>> chooser = INameChooser(folder)
>>> chooser
<dolmen.app.container.namechoosers.NormalizingNameChooser object at ...>

If no name is provided, the component uses the object’s title to compute an id:

>>> chooser.chooseName(name='', object=manfred)
'manfred'

If a name is provided, it is used if possible:

>>> chooser.chooseName(name='furry elephant', object=manfred)
'furry elephant'

If the name already exists, it adds a number at the end of the id. To do that, the name chooser will try all the values from 0 to 100 and keep the first successful combination:

>>> folder['manfred'] = object()
>>> chooser.chooseName(name='', object=manfred)
'manfred_1'

If there is no solution, an error is raised:

>>> for i in range(0, 101):
...   folder['manfred_%d' % i] = object()

>>> chooser.chooseName(name='', object=manfred)
Traceback (most recent call last):
...
ValueError: Cannot find a unique name based on `manfred` after 100 attemps.

Adding menu

Permissions

dolmen.app.container registers a viewlet listing the dolmen.content factories. It displays the factories allowed in the container. It checks the principal’s permissions in the process.

The viewlet is registered for the ‘AboveBody’ viewlet manager:

>>> from dolmen.app.layout import AboveBody
>>> from dolmen.app.container import AddMenu

>>> request = TestRequest()
>>> view = getMultiAdapter((folder, request), name="index")

>>> manager = AboveBody(folder, request, view)
>>> manager
<dolmen.app.layout.master.AboveBody object at ...>

>>> viewlet = AddMenu(folder, request, view, manager)
>>> viewlet.update()

As we are currently logged in as Manager, we can see all the factories:

>>> manager = Principal('zope.mgr')
>>> request.setPrincipal(manager)

>>> for factory in viewlet.factories: print factory['name']
dolmen.app.container.ftests.Folder
dolmen.app.container.ftests.Document

We can test the rendering:

>>> print viewlet.render()
<dl id="add-menu" class="menu additional-actions">
  <dt>Add to folder</dt>
  <dd>
    <ul>
      <li>
      <a href="http://127.0.0.1/folder/++add++dolmen.app.container.ftests.Folder"
    id="dolmen-app-container-ftests-Folder">
        <img src="http://127.0.0.1/@@/dolmen-content-interfaces-IContainer-contenttype_icon.png" alt="Container" width="16" height="16" border="0" />
        <span>a folderish content</span>
      </a>
      </li>
      <li>
      <a href="http://127.0.0.1/folder/++add++dolmen.app.container.ftests.Document"
    id="dolmen-app-container-ftests-Document">
        <img src="http://127.0.0.1/@@/dolmen-app-container-ftests-IDocument-contenttype_icon.png" alt="Document" width="16" height="16" border="0" />
        <span>a document</span>
      </a>
      </li>
    </ul>
  </dd>
</dl>

We now log a principal with no privileges:

>>> endInteraction()
>>> newInteraction(Participation(Principal('zope.judith')))

If we now try to render the viewlet, the Folder factory should not be available, as it is protected by the ‘dolmen.content.Add’ permission. The Document factory should be available as it’s not protected:

>>> viewlet.update()
>>> for factory in viewlet.factories: print factory['name']
dolmen.app.container.ftests.Document

Contraints

The viewlet also checks the constraints on the container and the factory.

We now log back our manager:

>>> endInteraction()
>>> newInteraction(Participation(Principal('zope.mgr')))

We test to see if everything is back to normal:

>>> viewlet.update()
>>> for factory in viewlet.factories: print factory['name']
dolmen.app.container.ftests.Folder
dolmen.app.container.ftests.Document

We apply a constraint on the folder. It will only be able to contain IDocument objects:

>>> from zope.interface import alsoProvides
>>> from zope.container.constraints import contains

>>> class IDocumentRepository(Interface):
...   contains(IDocument)

>>> alsoProvides(folder, IDocumentRepository)

We check the respect of the constraint:

>>> viewlet.update()
>>> for factory in viewlet.factories: print factory['name']
dolmen.app.container.ftests.Document

Listing

To complete the container’s tools, dolmen.app.container registers a view in charge of displaying the content of a container as a table.

First, we reset the container:

>>> del root['folder']
>>> folder = root['folder'] = Folder()

We add all kind of contents:

>>> folder['manfred'] = Document()
>>> folder['judith'] = Document()
>>> folder['subfolder'] = Folder()
>>> folder['not_dolmen.content.IBaseContent'] = object()

Then, we can query the listing view:

>>> listing = getMultiAdapter((folder, request), name="folderlisting")
>>> listing.update()

The table lines are a list of the container values:

>>> list(listing.values)
[<dolmen.app.container.ftests.Document object at ...>, <dolmen.app.container.ftests.Document object at ...>, <object object at ...>, <dolmen.app.container.ftests.Folder object at ...>]

The rendering displays links with icons (if existing):

>>> print listing.content()
<div class="folder-listing">
  <h1>Content of the folder</h1>
  <div><table class="listing sortable">
  <thead>
    <tr>
      <th>Title</th>
      <th>Modification date</th>
    </tr>
  </thead>
  <tbody>
    <tr class="even">
      <td><a href="http://127.0.0.1/folder/judith">judith</a></td>
      <td>None</td>
    </tr>
    <tr class="odd">
      <td><a href="http://127.0.0.1/folder/manfred">manfred</a></td>
      <td>None</td>
    </tr>
    <tr class="even">
      <td><a href="http://127.0.0.1/folder/not_dolmen.content.IBaseContent">not_dolmen.content.IBaseContent</a></td>
      <td></td>
    </tr>
    <tr class="odd">
      <td><a href="http://127.0.0.1/folder/subfolder">subfolder</a></td>
      <td>None</td>
    </tr>
  </tbody>
</table></div>
</div>

Credits

All Dolmen packages are sponsorised by NPAI (http://www.npai.fr)

Changelog

0.4 (2010-05-31)

• Added translations (FR).

• Removed icons from the folder listing.

0.3 (2010-01-26)

• Cleaned up the dependencies : zope.app.testing is no longer used.

0.2 (2009-12-26)

• Corrected imports. Now all the dependencies are declared.

• Updated imports to use the latest ZTK.

0.1 (2009-11-03)

• Initial release