new habtm association between core User and plugin Category

Added by Miguel Akira about 14 years ago

I'm trying to save a new HABTM relationship between User and Category.

My User model:

class User < ActiveRecord::Base
    has_and_belongs_to_many :categories
end

My Category model:

class Category < ActiveRecord::Base
     has_and_belongs_to_many :users
end

I have the join table set up correctly. THe problem is, I cannot change anything on the User controller, only on the User view. So, in the User view, there's a collection_select:

<%= f.collection_select :category_ids, Category.all, :id, :title, 
    { :selected => @user.category_ids }, 
    { :multiple => true, :name => 'user[category_ids][]' } 
-%>

I can correclty choose the categories that my User belong to, but when I click submit, every other attribute is saved except the category, which is not updated on the join table.

If I inspect the params, I can see that the category_ids is being passed correctly:

"user"=>{"category_ids"=>["2", "4"]

But i can't do anything with it on the User controller, since I'm not allowed to mess with the code. Is there someway to automatically update the join table, or I have to manually update it?

Thanks!

Replies (2)

RE: new habtm association between core User and plugin Category - Added by Miguel Akira about 14 years ago

In order to do that, I had to extend the core Update method on my UsersController. To do that, I had to edit the init.rb of my plugin:

### init.rb

## regular init.rb stuff.......

require_dependency 'users_controller'

module UsersControllerPatch
  def self.included(base) # :nodoc:
    base.class_eval do
      unloadable # Send unloadable so it will not be unloaded in development

      def update_with_update_patch
           temp = update_without_update_patch
            @user.categories = Category.find(params[:user][:category_ids]) 
            return @user
      end
      alias_method_chain :update, :update_patch
    end
  end
end

UsersController.send(:include, UsersControllerPatch)

And that's it.

RE: new habtm association between core User and plugin Category - Added by ria sophieanty almost 10 years ago

maybe its too late for asking now
can you tell me how you set up the join table for the category and the user model? any/what changes you make at user model?
thanks

(1-2/2)

Project

General

Profile

Redmine