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88 lines
3.1 KiB
Plaintext
88 lines
3.1 KiB
Plaintext
Managing Comments
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=================
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Comment management includes updating, deleting and approving comments. These operations are implemented as actions in the `CommentController` class.
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Updating and Deleting Comments
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------------------------------
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The code generated by `Gii` for updating and deleting comments remains largely unchanged.
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Approving Comments
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------------------
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When comments are newly created, they are in pending approval status and need to be approved in order to be visible to guest users. Approving a comment is mainly about changing the status column of the comment.
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We create an `actionApprove()` method in `CommentController` as follows,
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~~~
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[php]
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public function actionApprove()
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{
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if(Yii::app()->request->isPostRequest)
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{
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$comment=$this->loadModel();
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$comment->approve();
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$this->redirect(array('index'));
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}
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else
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throw new CHttpException(400,'Invalid request...');
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}
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~~~
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In the above, when the `approve` action is invoked via a POST request, we call the `approve()` method defined in the `Comment` model to change the status. We then redirect the user browser to the page displaying the post that this comment belongs to.
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Of course, we also need to create the `approve()` method in the `Comment` model. It is as follows,
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~~~
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[php]
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public function approve()
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{
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$this->status=Comment::STATUS_APPROVED;
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$this->update(array('status'));
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}
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~~~
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Here we are simply setting the status property of the comment to `approved` as defined by the status constants in the `Comment` class:
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~~~
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[php]
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class Comment extends CActiveRecord
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{
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...
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const STATUS_PENDING=1;
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const STATUS_APPROVED=2;
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..
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}
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~~~
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and then calling the `update()` method to save this newly set property to the database.
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We also modify the `actionIndex()` method of `CommentController` to show all comments. We would like to see comments pending approval show up first.
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~~~
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[php]
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public function actionIndex()
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{
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$dataProvider=new CActiveDataProvider('Comment', array(
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'criteria'=>array(
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'with'=>'post',
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'order'=>'t.status, t.create_time DESC',
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),
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));
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$this->render('index',array(
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'dataProvider'=>$dataProvider,
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));
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}
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~~~
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Notice that in the above code, because both `tbl_post` and `tbl_comment` have columns `status` and `create_time`, we need to disambiguate the corresponding column reference by prefixing them with table alias names. As described in [the guide](http://www.yiiframework.com/doc/guide/database.arr#disambiguating-column-names), the alias for the primary table in a relational query is always `t`. Therefore, we are prefixing `t` to the `status` and `create_time` columns in the above code to indicate we want these values taken from the primary table, `tbl_comment`.
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Like the post index view, the `index` view for `CommentController` uses [CListView] to display the comment list which in turn uses the partial view `/wwwroot/blog/protected/views/comment/_view.php` to display the detail of each individual comment. We will not go into details here. Interested readers may refer to the corresponding file in the blog demo `/wwwroot/yii/demos/blog/protected/views/comment/_view.php`.
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<div class="revision">$Id$</div> |