Plone support for the contentratings package
plone.contentratings is an add-on package for the Plone content management system. It extends the Zope3 package contentratings to provide through the web configurable rating categories for all CMF content. It AJAX-ifies the rating UI using KSS actions.
After making the package plone.contentratings and its dependencies available to your Zope instance and restarting Zope, you should have a “product” called contentratings available in the Plone Quick Installer (the Add-on Products control panel). Installing this “product” will add a new control panel to Plone called Ratings. This panel provides two configuration sections. One for associating particular content types with rating categories, and another for adding and managing rating categories.
On the Rating Assignments tab, you can choose a portal type and then select the rating categories to associate with the type in the multi-select below the type selector. Once you have selected the categories, press the save button before selecting another type.
Once this is done, a rating UI will appear on the view for the selected type. This ui will allow setting and viewing ratings in all the selected categories. The order in which the categories appear will be the same as the order in the multi-select, and is determined by the order specified in the rating category configuration (see the next section).
You can disable ratings on an individual content object on the edit form for that content object. Just uncheck the Enable Ratings checkbox on the Settings tab.
The Manage Categories tab of the control panel allows you to create custom categories, and modify or remove categories that you have created. Initially, there will be no local categories, only Acquired Categories. These are categories which are not defined in the control panel but in python packages/products on the filesystem. The acquired categories cannot be edited.
To add a new category, click the Add Local Categories button. Then fill in a title for the category (this is the title that will appear in the rating UI). All other fields are optional. You may enter a description (primarily for documentation purposes). You can enter TALES expressions for determining when users can and cannot view or set ratings in the category. If left blank all users will be able to both view and set ratings. To use permissions to restrict the ratings, use an expression like:
python: checkPermission('View', context)
The order in which the categories are displayed in the UI is determined by the order attribute which should be an integer. The view setting determines how the rating should appear in the UI. Python products can register rating views to provide different look and feel or behavior. Instructions for creating and registering new views can be found in the documentation of the contentratings package. If you use a completely custom class for your view, make sure it implements the contentratings.browser.interfaces.IRatingView interface and is registered for the contentratings.interfaces.IUserRating interface, which will ensure that it appears in the listing.
You can remove custom categories by checking the box next to the category and clicking the remove button. You can of course edit any of the category attributes. You must click the Save button to record your changes (including removing categories).
Notes On Category Names: Internally, categories are registered and accessed using unique names. For TTW created categories, these names are generated from the title using a mechanism similar to that used by Plone to generate ids for content objects. This has a couple of consequences. If you create a category, rate content using that category, and then remove the category, the ratings will still be stored on the content under the original category name. So if you later create a “new” category with the same title (and hence the same name), all content previously rated under the category will still have rating information attached. This makes it very easy to undo a mistaken removal of a category, but may cause some unexpected behavior.
Additionally, this also makes it possible to override a category defined globally by creating one with an identical name. However, there is no guarantee that the names of globally defined are related to their titles, so it’s not always obvious how to do this, nor is aldoing this recommended. You may end up with two categories with the same title , differentiated only by their order, which is likely to lead to confusion when assigning categories.
Notes for Developers
Creating global categories and custom rating views should be a straightforward process for developers who have read the contentratings documentation. There are a few special things to note when developing custom rating behavior for Plone.
If you want a custom global categories to be available in the control panel, it must be registered for the Products.CMFCore.interfaces.IDynamicType interface. Also, only categories providing the contentratings.interfaces.IUserRating interface will appear in the control panel (which means that they must use a storage factory implementing IUserRating). If you register a category for an interface specific to your type(s), then it will appear in the UI on any content implementing that interface, will not appear in the control panel configuration, and will not respect the Enable Ratings checkbox on content objects.
If you want to implement a custom Rating Manager for your content types (which presumably also implement IDynamicType), you should inherit from the PloneRatingCategoryAdapter, rather than the standard RatingCategoryAdapter in contentratings. Without the behaviors defined in this class, any TTW categories assigned to types using the custom rating manager are likely to break or not appear.
It’s possible to install a LocalAssignmentUtility (from plone.contentratings.assignment) in any local site manager within a CMF site. When this is done, the @@contentratings-controlpanel view can be used on that local site. When changes are made in the local control panel, they will affect content within that local site.
Within a local site, the Acquired Categories section of the Manage Categories tab will contain both global categories and categories defined in site managers below the current site (e.g. at the portal). These cannot be edited, but they can be overridden (see the Notes On Category Names section above).
Installing the utility in a local site manager above the Plone root, must be done programatically for now. The promising plone.localconf package may soon provide a generic mechanism and UI for such installations.
- Add mechanism to make it easy to create indexes for specific aspects of rating categories (e.g., (avg rating, number of ratings), users who have rated an object, …. This probably needs some infrastructure support in Plone (e.g. a more flexible implementation of the IIndexableObjectWrapper stuff).
- Aggregate statistics across multiple rating categories and a user interface for displaying them. This probably requires some support in the underlying contentratings package, and may be best left to individual applications using this infrastructure.
1.0 rc1 (2010-08-31)
- Add indexing of average rating and users that have rated content. [alecm]
- Added Spanish and Czech translations. [dukebody, macagua]
- Added uninstall profile. [alecm]
1.0 beta2 2009-07-06
- Added auto-save on type change in control panel (disabled due to KSS bug). [alecm]
- Added fixes for KSS issues. [alecm]
- Added missing metadata.xml and made setup.py read out it’s version. [saily]
- Added german translations. [saily]
- Restructured and updated HISTORY.txt. [saily]
1.0 beta - 2008-05-10
- A completely new architecture for defining and storing ratings. Introduces the concepts of rating categories and rating views.
0.2 beta - 2008-05-10
- A bugfix release with many improvements from 0.1. This package is superseded by version 1.0 which has a completely new architecture though it should be backwards compatible.
0.1 - Released
- Initial package structure. [alecm]
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