Acts As Commentable Plugin

famoseagle

I think something happened to this plugin with the newest version of rails. Basically, every time I reload the comment model it’s not picking up the belongs_to relationship. So:

belongs_to :user

Causes an ActiveRecord::AssociationTypeMismatch error. Says:

User expected, got User

That doesn’t make much sense. I know it’s probably a rails issue, but I thought you might have some insight. There are some other loading issues that are a bit too complex to explain in this little form.

carlivar

How can I do counter caching with acts_as_commentable? Not sure how that works with polymorphic relationships. Currently I am summarizing comment counts quite often which is leading to a lot of extra db queries. Thanks!

TechKnow

@carlivar – You can have a summary table for you model which might have a count of the comment for that model. The summary table is not part of the plugin, so at this time you would need to manage that…

@bmctigue – The migration in the README used to have comment as a string type this has been modified to describe the comment as a text for a while now. Sorry for any inconvenience that might have caused.

Anand

Hi

Many thanks for this neat plugin. I needed comments on comments [multi level].

I changed Comment itself to be acts_as_commentable and it works just fine. Do you see any problems with this approach?

anand

matthibcn

Never mind, in my enthusiasm I added an CommentModel to my app before reading further yesterday night and then forgot about it at all..so it was overwriting the plugins modelClass..it works as promised ;)

Thx and regards

Jan

@famoseagle: I was thrown back by the same bug as you today and I think I found the problem: Since plugin code doesn’t get reloaded on every request, the comment model saves the object type of the user model at “load time”, but the user model gets reloaded at every request (at least in development mode) and so the user model gets a new object_id every time and this is not reflected in the comments model association.

The error message is funny, but User and User are really two different things, then. One solution is to move comment.rb to app/models/, since then it will be reloaded, too and all is synchronized.

A more complete description can be found at

http://localhost3000.de/2007/04/17/acts_as_commentable-reload-fubar/

Hope it helps.

Mark

After upgrading to rails 1.2.3 I am occasionally getting the following error when accessing the comments for a model that acts_as_commentable.

undefined method `table_name’ for REXML::Comment:Class

It appears that the wrong Comment class is being referenced. Has anybody else seen this? Does anybody know how to fix it?

Thanks,
Mark

Avi

I sexy’d up that migration for Rails 2.0 or the Sexy_Migration plugin:

def self.up
  create_table :comments, :force => true do
    string :title, :limit => 50, :default => ""
    string :comment, :default => ""
    timestamps!
    polymorphic :commentable
    foreign_key :user
  end

  add_index :comments, ["user_id"], :name => "fk_comments_user"
end

def self.down
  drop_table :comments
end

Andrew Gordon

Great plugin thanks

Evan

Andrew -

You should be able to make use of the model associations (ie, has_many: , belongs_to:, etc) to pull in the name of the user from another table. An example:

” class=”comment_bar”>
” class=”comment_header”> ()
” class=”comment_body”>

Soleone

Very good plugin, because it’s easy to install and use, and also easy to change since it’s so small.

Note: The sexy migration (Rails 2.0 style) posted here does not work and needs some changes first.

Jason

Awesome plugin! If you’d like to map the comments table to a non-standard user foreign key but aren’t sure where to start, I wrote up a short blog post about it: Using acts_as_commentable with a non-standard user foreign key

Hope this helps somebody!

Ivan Storck

This is the migration I used for Rails 2.0 (mostly sexy migrations)

  def self.up
    create_table :comments, :force => true do |t|
      t.string :title, :default => ""
      t.text :comment, :default => ""
      t.timestamps
      t.integer :user_id, :default => 0, :null => false
      t.string :web_site
      t.string :email
      t.string :name
      t.references :commentable, :polymorphic => true
    end
    add_index :comments, ["user_id"], :name => "fk_comments_user"
  end

Keith Carter

Is there a way to eager load the objects associated with comments?

Alexey

I just remember year ago i put this plugin in rails 1.2.6 .. now in 2.1.2 :)

Auraelius

Hi,
I’m having trouble when using acts_as_commentable with restful_authentication: The user_id field in the comment table is never getting set — all the values are NULL.

I have a “users” table as supplied by that plugin. Is acts_as_commentable looking for a “user” table? I’m still trying to understand all of Rails’ pluralization.

Where in the code does the user_id get set? I’m stepping through the process with a debugger and can’t see it happening. Is this something ActiveRecord does?

Thanks for helping a newbie figure things out!

TechKnow

@Jeff – Thanks for that info, I test this on a more recent Rails version. I can’t believe it, but this plugin was originally written in Rails 1.2 and now there is talk of Rails 3.0.