zc.comment 0.1.0

Comments

The comment package is a simple way to add comments to any IAnnotatable Zope content. The datetime and current principals are stamped on to the comment. The comment body is currently simply unicode text but intended to be html snippets (“rich text”) at a later date.

The inclusion of current principals requires an interaction, which is what we need to set up before we can use the system here. Below, we set up a dummy interaction with dummy participants, create some content that is IAttributeAnnotatable, and then finally show the system in use.

In order to create a participation, we need a few principals:

>>> import zope.security.management
>>> import zope.security.interfaces
>>> from zope import interface
>>> class Principal(object):
...     interface.implements(zope.security.interfaces.IPrincipal)
...
...     def __init__(self, id, title, description):
...         self.id = id
...         self.title = title
...         self.description = description
...
...     def __repr__(self):
...         return '<%s %r>' %(self.__class__.__name__, self.id)

>>> alice = Principal('alice', 'Alice Aal', 'first principal')
>>> betty = Principal('betty', 'Betty Barnes', 'second principal')

Now we can create a participation:

>>> class Participation(object):
...     zope.interface.implements(
...         zope.security.interfaces.IParticipation,
...         zope.publisher.interfaces.IRequest)
...     interaction = principal = None
...
...     def __init__(self, principal):
...         self.principal = principal
...
...     def __repr__(self):
...         return '<%s %r>' %(self.__class__.__name__, self.principal)

Next we need to make sute the annotation mechanism is setup, because the comments adapter needs to be able to annotate the adapted object:

>>> import zope.component
>>> import zope.annotation
>>> zope.component.provideAdapter(
...     zope.annotation.attribute.AttributeAnnotations)

Let’s now make sure that all commentable objects can receive comments:

>>> from zc.comment import comment
>>> zope.component.provideAdapter(comment.CommentsFactory)

Now that we have everything setup, let’s have a look at how it works. First we need a simple content component:

>>> class SimpleContent(object):
...     interface.implements(
...         zope.annotation.interfaces.IAttributeAnnotatable)
...     def __init__(self, name):
...         self.name = name
...     def __repr__(self):
...         return '<%s %r>' %(self.__class__.__name__, self.name)
>>> content = SimpleContent(u'content')

In order to play with the comments, we now have to register a new participation. In our case, Alice wants to create a comment:

>>> zope.security.management.endInteraction()
>>> zope.security.management.newInteraction(Participation(alice))

We can access the comments of an object by adapting to IComments:

>>> from zc.comment import interfaces
>>> comments = interfaces.IComments(content)
Traceback (most recent call last):
...
TypeError: ('Could not adapt',
            <SimpleContent u'content'>,
            <InterfaceClass zc.comment.interfaces.IComments>)

Initially, the component is not commentable, because it does not provide the correct interface:

>>> zope.interface.directlyProvides(content, interfaces.ICommentable)

>>> comments = interfaces.IComments(content)
>>> comments
<Comments (0) for <SimpleContent u'content'>>

Let’s now add a comment:

>>> import datetime, pytz
>>> before = datetime.datetime.now(pytz.utc)

>>> comments.add(u"Foo!  Bar!")

>>> after = datetime.datetime.now(pytz.utc)

As you can see it was not necessary to create the comments object manually, but simply pass in the text. Clearly a comment has been added:

>>> len(comments)
1

Let’s now make sure that the data was set correctly:

>>> comments[0].body
u'Foo!  Bar!'
>>> before <= comments[0].date <= after
True
>>> comments[0].principal_ids
('alice',)

Let’s now log in as Betty:

>>> zope.security.management.endInteraction()
>>> zope.security.management.newInteraction(Participation(betty))

Betty can also add a comment:

>>> comments = interfaces.IComments(content)
>>> before = datetime.datetime.now(pytz.utc)
>>> comments.add(u"Shazam")
>>> after = datetime.datetime.now(pytz.utc)
>>> len(comments)
2

And her comment is also correctly stored:

>>> comments[1].body
u'Shazam'
>>> before <= comments[1].date <= after
True
>>> comments[1].principal_ids
('betty',)

Let’s now make sure that if multiple participants are in the interaction that all of them get picked up:

>>> zope.security.management.endInteraction()
>>> zope.security.management.newInteraction(
...     Participation(alice), Participation(betty))

>>> comments.add(u"Boom.")
>>> len(comments)
3
>>> comments[2].body
u'Boom.'
>>> comments[2].principal_ids
('alice', 'betty')

Finally, note that we can only add unicode text as a valid comment:

>>> comments.add(42)
Traceback (most recent call last):
...
WrongType: (42, <type 'unicode'>)

If you like, you can always clear all comments:

>>> comments.clear()
>>> len(comments)
0

And of course some cleanup:

>>> zope.security.management.endInteraction()

Commenting UI

Create the browser object we’ll be using.

>>> from zope.testbrowser.testing import Browser
>>> browser = Browser()
>>> browser.addHeader('Accept-Language', 'test')

To see how comments work, we’ll create an instance of a simple content object:

>>> browser.open('http://localhost/@@contents.html')
>>> browser.getLink('[[zope][[top]]]').click()
>>> browser.getLink('[[zc.comment][Content]]').click()
>>> browser.getControl(name='new_value').value = 'number'
>>> browser.getControl('[[zope][container-apply-button (Apply)]]').click()

Let’s visit the object and click on the comments tab:

>>> browser.handleErrors = False
>>> browser.getLink('number').click()
>>> browser.getLink('[[zc.comment][Comments]]').click()

We see that no comments have been made yet:

>>> '[[zc.intranet][No comments have been made.]]' in browser.contents
True

Let’s add a new multi-line comment:

>>> browser.getControl('[[zc.comment][New Comment]]').value = '''\
... I give my pledge, as an Earthling
... to save, and faithfully defend from waste
... the natural resources of my planet.
... It's soils, minerals, forests, waters, and wildlife.
... '''

>>> browser.getControl('[[zc.comment][Add Comment]]').click()

Now, we get a table that displays the comment with it’s date, text, and the user who made it:

>>> print browser.contents
<...
      <th>
      ...[[zc.comment][comment_column-date (Date)]]...
      </th>
      <th>
      ...[[zc.comment][comment_column-principals (Principals)]]...
      </th>
      <th>
        [[zc.comment][comment_column-comment (Comment)]]
      </th>
    ...
    <td>
      2005 11 14  12:00:55 -500
    </td>
    <td>
      Unauthenticated User
    </td>
    <td>
      I give my pledge, as an Earthling<br />
to save, and faithfully defend from waste<br />
the natural resources of my planet.<br />
It's soils, minerals, forests, waters, and wildlife.<br />
...
 <label for="form.comment">
    <span class="required">*</span><span>[[zc.comment][New Comment]]</span>
  </label>
  ...<textarea class="zc-comment-text"
               style="width: 50ex; height: 6em;"
               cols="60" id="form.comment"
               name="form.comment" rows="15" ></textarea></div>
...
    <input type="submit"
           id="form.actions.41646420436f6d6d656e74"
           name="form.actions.41646420436f6d6d656e74"
           value="[[zc.comment][Add Comment]]"
           class="button" />
...

Now, we’ll add another comment.

>>> browser.getControl('[[zc.comment][New Comment]]'
...     ).value = 'another comment'
>>> browser.getControl('[[zc.comment][Add Comment]]').click()
>>> print browser.contents
<...
      <th>
...[[zc.comment][comment_column-date (Date)]]...
      </th>
      <th>
...[[zc.comment][comment_column-principals (Principals)]]...
      </th>
      <th>
        [[zc.comment][comment_column-comment (Comment)]]
      </th>
  </tr>
...
    <td>
      2005 11 14  12:10:18 -500
    </td>
    <td>
      Unauthenticated User
    </td>
    <td>
      I give my pledge, as an Earthling<br />
to save, and faithfully defend from waste<br />
the natural resources of my planet.<br />
It's soils, minerals, forests, waters, and wildlife.<br />
<BLANKLINE>
    </td>
  </tr>
  ...
    <td>
      2005 11 14  12:10:18 -500
    </td>
    <td>
      Unauthenticated User
    </td>
    <td>
      another comment
    </td>
  </tr>
...
<label for="form.comment">
  <span class="required">*</span><span>[[zc.comment][New Comment]]</span>
</label>
...
...<textarea class="zc-comment-text"
             style="width: 50ex; height: 6em;"
             cols="60"
             id="form.comment"
             name="form.comment"
             rows="15" ></textarea>...
    <input type="submit"
           id="form.actions.41646420436f6d6d656e74"
           name="form.actions.41646420436f6d6d656e74"
           value="[[zc.comment][Add Comment]]"
           class="button" />
...

CHANGES

0.1.0 (2008-04-21)

• Initial Release