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Listing of content for the Plone CMS

Latest Version: 1.1.1

Listing and working with Plone content objects using

This is valid for Plone 4.1 upwards.

Many of the operations for customizations, templates, views and portlets in
Plone are related to lists of content objects. Their sources can be different,
although usually they are some sort of catalog search, the contents of a
particular folder or a list of objects from a relation.

To make it simpler to work with these, we have made,
which ensures that lists of content objects always behave in the same way and
according to predefined interfaces, regardless of what the source of the
objects are. The integrator shouldn't have to care whether the list of objects
came from the catalog, an ORM or they are the actual objects.

Making or getting a contentListing

The typical way to get a contentlisting is to call one of two built-in views:

Listing the contents of a folder

In Page templates getting the contents of a folder is as simple as this::


Every template-writer's dream ;)

A real example of listing the titles of the content objects of a folder::

The context in which it is called defines which folder is listed.

You can also use Python expressions to be able to pass parameters, like which
content type or review state you want to use::

  • Batching can be done like this::

    Note that you iterate directly over the results that you get from
    ``@@folderListing``. The definition of ``batch`` is only used in the
    ``batch_macros`` call.

    In Python a ContentListing of a particular folder's contents can be fetched
    by using::


    The folderListing view called above implements all the logic the old
    getFolderContents script in Plone used to do. The old script has been left in
    place to not break compatibility for customizations and add-ons that might
    depend on its particular return values.

    Rolling your own with adaption

    At the time of writing, all parts of Plone do not yet return 'contentlistings'
    when asked for lists of content. It was impossible to change this everywhere
    without breaking backwards compatibility. Therefore you may have to convert
    your sequence of stuff to a contentlisting manually.

    To do this, you need to import and adapt::

    >>> from import IContentListing
    >>> catalog = getToolByName(self.portal, 'portal_catalog')
    >>> results = catalog.searchResults()
    >>> contentlist = IContentListing(results)
    >>> print(contentlist)
    < object="" ...="">

    The contentListing, its properties and behaviors

    Now, you no longer need to worry whether you have a bunch of catalog brains or
    the actual objects (or fake objects for that sake). As long as you have a
    contentlisting, you know what you can expect from it. You also know what you
    can expect from each item within it - a content listing object.

    The content listing is a normal iterator that we can loop over and do all sorts
    of stuff you normally can do with sequences.

    contentListingObjects, the items inside the sequence

    The `contentListingObjects` are wrapper objects, each representing a content
    object in the site. Their intention is to be predictable so you can always call
    at least a common base set of methods on the objects listed.

    You do not have to be aware whether the object originates from a brain, a full
    object or something else. If you try to call a method or access an attribute of
    the object and the wrapper is not aware of it, it will silently fetch the real
    object and delegate the call to it. This means you can treat your objects as
    you would any other -- even writing to it.

    Methods of contentlistingObjects

    getId() -
    Returns the object id in its container for example `my-example-page`.

    getObject() -
    Returns the real object

    def getDataOrigin() -
    The origin of the data for the object.

    getPath() -
    Path to the object, relative to the site root for example

    Full url to the object, including the site root for example

    uuid() -
    Unique content identifier for example an uuid from `plone.uuid` The only real
    point of it is to be unique. It can for example look like this

    getIcon() -
    Icon for the object. Returns an icon object from
    If printed as a string, it will produce an HTML tag for the icon. Check for more info.

    getSize() -
    Size in bytes for example `24`.

    review_state() -
    Workflow review state for example `published`.

    ContentTypeClass() -
    A normalized type name that identifies the object in listings. Used for CSS
    styling, for example `content-type-page`.

    Title() -
    Return a single string, the DCMI Title element (resource name).
    For example `My example page`.

    Description() -
    Return the DCMI Description element (resource summary). Result is a natural
    language description of this object. Description is a plain text string
    describing the object. It should not contain HTML or similar.

    Type() -
    Return the DCMI Type element (resource type). Result is a human-readable
    message id for the resource (typically the Title of its type info object).
    For example `u'Page'` from the `plone` domain.

    listCreators() -
    Return a sequence of DCMI Creator elements (resource authors).
    Depending on the implementation, this returns the full name(s) of the
    author(s) of the content object or their ids. For example `Jane Smith`.

    Creator() -
    Return the first DCMI Creator element, or an empty string.
    For example `Jane Smith`.

    Subject() -
    Return a sequence of DCMI Subject elements (resource keywords).
    Result is zero or more keywords associated with the content object.
    These are the tags in Plone. For example ``['Ecology', 'Sustainability']``.

    Publisher() -
    Return the DCMI Publisher element (resource publisher). Result is the full
    formal name of the entity or person responsible for publishing the resource.
    For example `Plone Foundation`.

    listContributors() -
    Return a sequence of DCMI Contributor elements (resource collaborators).
    Return zero or more collaborators (beyond those returned by `listCreators`).

    Contributors() -
    Deprecated alias for `listContributors`.

    Date(zone=None) -
    Return the DCMI Date element (default resource date). Result is a string,
    formatted 'YYYY-MM-DD H24:MN:SS TZ'. The zone keyword is not yet supported
    (but is part of the DublinCore interface and has to stay)

    CreationDate(zone=None) -
    Return the DCMI Date element (date resource created). Result is a string,
    formatted 'YYYY-MM-DD H24:MN:SS TZ'. The zone keyword is not yet supported
    (but is part of the DublinCore interface and has to stay)

    EffectiveDate(zone=None) -
    Return the DCMI Date element (date resource becomes effective). Result is a
    string, formatted 'YYYY-MM-DD H24:MN:SS TZ', or None. The zone keyword is
    not yet supported (but is part of the DublinCore interface and has to stay)

    ExpirationDate(zone=None) -
    Return the DCMI Date element (date resource expires). Result is a string,
    formatted 'YYYY-MM-DD H24:MN:SS TZ', or None. The zone keyword is not yet
    supported (but is part of the DublinCore interface and has to stay)

    ModificationDate(zone=None) -
    DCMI Date element - date resource last modified. Result is a string,
    formatted 'YYYY-MM-DD H24:MN:SS TZ'. The zone keyword is not yet supported
    (but is part of the DublinCore interface and has to stay)

    Format() -
    Return the DCMI Format element (resource format).
    Result is the resource's MIME type (e.g. `text/html`, `image/png`, etc.).

    Identifier() -
    Return the DCMI Identifier element (resource ID). Result is a unique ID
    (a URL) for the resource.

    Language() -
    DCMI Language element (resource language). Result it the RFC language code
    (e.g. `en-US`, `pt-BR`) for the resource.

    Rights() -
    Return the DCMI Rights element (resource copyright). Return a string
    describing the intellectual property status, if any, of the resource.

    isVisibleInNav() -
    Return whether this object will be visible in a navigation view.

    1.1.0 (2014-04-16)

    - Use proper styleguide for headings.

    - Move README to /docs folder.

    - Replace deprecated test assert statements.

    - Removing language tests and fixing icon tests to get the correct images.

    - Use PLONE_APP_CONTENTTYPES fixture for Plone 5.

    1.0.5 (2013-08-13)

    - Add missing getDataOrigin method to interfaces.

    1.0.4 (2013-01-01)

    1.0.3 (2012-10-29)

    - Whoever heard I liked batching was wrong. The Catalog results are
    already batched, so don't batch them again.

    1.0.2 (2012-10-15)

    - Nothing changed yet.

    1.0.1 (2012-04-15)

    - Change ContentTypeClass to return contenttype-{portal_type} to match
    what the rest of Plone expects. This fixes sprite based icons for

    1.0 - 2011-07-19

    - Removed `searchResults` view and related code. Search is handled inside

    - Renamed `uniqueIdentifier` method to `uuid` for shorter and more consistent
    naming with `plone.uuid`.

    0.1b2 - 2011-04-15

    - Unit tests for appendViewAction, compare against portal_type rather than Type.

    - Handle RealContentListingObject objects in isVisibleFromNav,
    appendViewAction. Remove memoise, isn't going to cache anything for a useful
    amount of time.

    0.1b1 - 2011-04-15

    - Add an isVisibleFromNav method, based on use
    memoise to cache lookup of portal_properties

    - Add

    0.1a1 - 2011-03-02

    - Initial release
    File Type Py Version Uploaded on Size (md5) Source 2014-04-16 39KB
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