203 lines
7.2 KiB
Plaintext
203 lines
7.2 KiB
Plaintext
==================================
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Customizing the comments framework
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==================================
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.. currentmodule:: django.contrib.comments
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If the built-in comment framework doesn't quite fit your needs, you can extend
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the comment app's behavior to add custom data and logic. The comments framework
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lets you extend the built-in comment model, the built-in comment form, and the
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various comment views.
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The :setting:`COMMENTS_APP` setting is where this customization begins. Set
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:setting:`COMMENTS_APP` to the name of the app you'd like to use to provide
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custom behavior. You'll use the same syntax as you'd use for
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:setting:`INSTALLED_APPS`, and the app given must also be in the
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:setting:`INSTALLED_APPS` list.
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For example, if you wanted to use an app named ``my_comment_app``, your
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settings file would contain::
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INSTALLED_APPS = [
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...
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'my_comment_app',
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...
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]
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COMMENTS_APP = 'my_comment_app'
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The app named in :setting:`COMMENTS_APP` provides its custom behavior by
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defining some module-level functions in the app's ``__init__.py``. The
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:ref:`complete list of these functions <custom-comment-app-api>` can be found
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below, but first let's look at a quick example.
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An example custom comments app
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==============================
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One of the most common types of customization is modifying the set of fields
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provided on the built-in comment model. For example, some sites that allow
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comments want the commentator to provide a title for their comment; the built-in
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comment model has no field for that title.
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To make this kind of customization, we'll need to do three things:
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#. Create a custom comment :class:`~django.db.models.Model` that adds on the
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"title" field.
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#. Create a custom comment :class:`~django.forms.Form` that also adds this
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"title" field.
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#. Inform Django of these objects by defining a few functions in a
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custom :setting:`COMMENTS_APP`.
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So, carrying on the example above, we're dealing with a typical app structure in
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the ``my_custom_app`` directory::
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my_custom_app/
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__init__.py
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models.py
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forms.py
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In the ``models.py`` we'll define a ``CommentWithTitle`` model::
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from django.db import models
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from django.contrib.comments.models import Comment
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class CommentWithTitle(Comment):
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title = models.CharField(max_length=300)
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Most custom comment models will subclass the :class:`Comment` model. However,
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if you want to substantially remove or change the fields available in the
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:class:`Comment` model, but don't want to rewrite the templates, you could
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try subclassing from :class:`BaseCommentAbstractModel`.
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Next, we'll define a custom comment form in ``forms.py``. This is a little more
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tricky: we have to both create a form and override
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:meth:`CommentForm.get_comment_model` and
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:meth:`CommentForm.get_comment_create_data` to return deal with our custom title
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field::
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from django import forms
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from django.contrib.comments.forms import CommentForm
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from my_comment_app.models import CommentWithTitle
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class CommentFormWithTitle(CommentForm):
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title = forms.CharField(max_length=300)
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def get_comment_model(self):
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# Use our custom comment model instead of the built-in one.
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return CommentWithTitle
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def get_comment_create_data(self):
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# Use the data of the superclass, and add in the title field
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data = super(CommentFormWithTitle, self).get_comment_create_data()
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data['title'] = self.cleaned_data['title']
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return data
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Django provides a couple of "helper" classes to make writing certain types of
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custom comment forms easier; see :mod:`django.contrib.comments.forms` for
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more.
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Finally, we'll define a couple of methods in ``my_custom_app/__init__.py`` to
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point Django at these classes we've created::
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from my_comments_app.models import CommentWithTitle
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from my_comments_app.forms import CommentFormWithTitle
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def get_model():
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return CommentWithTitle
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def get_form():
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return CommentFormWithTitle
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.. warning::
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Be careful not to create cyclic imports in your custom comments app.
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If you feel your comment configuration isn't being used as defined --
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for example, if your comment moderation policy isn't being applied --
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you may have a cyclic import problem.
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If you are having unexplained problems with comments behavior, check
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if your custom comments application imports (even indirectly)
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any module that itself imports Django's comments module.
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The above process should take care of most common situations. For more
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advanced usage, there are additional methods you can define. Those are
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explained in the next section.
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.. _custom-comment-app-api:
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Custom comment app API
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======================
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The :mod:`django.contrib.comments` app defines the following methods; any
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custom comment app must define at least one of them. All are optional,
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however.
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.. function:: get_model()
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Return the :class:`~django.db.models.Model` class to use for comments. This
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model should inherit from
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:class:`django.contrib.comments.models.BaseCommentAbstractModel`, which
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defines necessary core fields.
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The default implementation returns
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:class:`django.contrib.comments.models.Comment`.
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.. function:: get_form()
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Return the :class:`~django.forms.Form` class you want to use for
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creating, validating, and saving your comment model. Your custom
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comment form should accept an additional first argument,
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``target_object``, which is the object the comment will be
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attached to.
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The default implementation returns
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:class:`django.contrib.comments.forms.CommentForm`.
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.. note::
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The default comment form also includes a number of unobtrusive
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spam-prevention features (see
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:ref:`notes-on-the-comment-form`). If replacing it with your
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own form, you may want to look at the source code for the
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built-in form and consider incorporating similar features.
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.. function:: get_form_target()
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Return the URL for POSTing comments. This will be the ``<form action>``
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attribute when rendering your comment form.
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The default implementation returns a reverse-resolved URL pointing
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to the :func:`post_comment` view.
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.. note::
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If you provide a custom comment model and/or form, but you
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want to use the default :func:`post_comment` view, you will
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need to be aware that it requires the model and form to have
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certain additional attributes and methods: see the
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:func:`post_comment` view documentation for details.
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.. function:: get_flag_url()
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Return the URL for the "flag this comment" view.
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The default implementation returns a reverse-resolved URL pointing
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to the :func:`django.contrib.comments.views.moderation.flag` view.
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.. function:: get_delete_url()
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Return the URL for the "delete this comment" view.
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The default implementation returns a reverse-resolved URL pointing
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to the :func:`django.contrib.comments.views.moderation.delete` view.
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.. function:: get_approve_url()
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Return the URL for the "approve this comment from moderation" view.
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The default implementation returns a reverse-resolved URL pointing
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to the :func:`django.contrib.comments.views.moderation.approve` view.
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