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## Deleting Comments
Another important feature on a blog is being able to delete SPAM comments. To do this, we need to implement a link of some sort in the view and a `DELETE` action in the `CommentsController`.
So first, let’s add the delete link in the `app/views/comments/_comment.html.erb` partial:
@@@ html
<p>
<b>Commenter:</b>
<%= comment.commenter %>
</p>
<p>
<b>Comment:</b>
<%= comment.body %>
</p>
<p>
<%= link_to 'Destroy Comment', [comment.post, comment],
:confirm => 'Are you sure?',
:method => :delete %>
</p>
@@@
Clicking this new “Destroy Comment” link will fire off a `DELETE /posts/:id/comments/:id` to our `CommentsController`, which can then use this to find the comment we want to delete, so let’s add a `destroy` action to our controller:
@@@ ruby
class CommentsController < ApplicationController
def create
@post = Post.find(params[:post_id])
@comment = @post.comments.create(params[:comment])
redirect_to post_path(@post)
end
def destroy
@post = Post.find(params[:post_id])
@comment = @post.comments.find(params[:id])
@comment.destroy
redirect_to post_path(@post)
end
end
@@@
The `destroy` action will find the post we are looking at, locate the comment within the `@post.comments` collection, and then remove it from the database and send us back to the `show` action for the post.
### Deleting Associated Objects
If you delete a post then its associated comments will also need to be deleted. Otherwise they would simply occupy space in the database. Rails allows you to use the `dependent` option of an association to achieve this. Modify the `Post` model, `app/models/post.rb`, as follows:
@@@ ruby
class Post < ActiveRecord::Base
validates :name, :presence => true
validates :title, :presence => true,
:length => { :minimum => 5 }
has_many :comments, :dependent => :destroy
end
@@@
Version data entries
11 entries across 11 versions & 1 rubygems