Ruby on Rails and mongoid. Relations

Question

I have some question about RoR and MongoDB(use gem mongoid). For example I have two collection- users(fields: id, username, age) and messages(fields: id, message, user_to, user_from). I need to relate this collections. The model user-

....
has_many :messages

The model message-

....
belongs_to :to_user, :class_name => 'User', :foreign_key => 'user_to'
belongs_to :from_user, :class_name => 'User', :foreign_key => 'user_from'

Call in my view-

- @messages.each do |message|
  %tr
    %td    
      = message.message
    %td
      = message.to_user.username
    %td
      = message.from_user.username

But it not working. Please tell me how to relate it. B.R.

Santhosh · Accepted Answer · 2013-09-27 09:47:16Z

3

You have to provide inverse relation

belongs_to :to_user, :class_name => 'User', :inverse_of => :recieved_messages
belongs_to :from_user, :class_name => 'User', :inverse_of => :sent_messages

user.rb

has_many :recieved_messages, :class_name => 'Message', :inverse_of => :to_user
has_many :sent_messages, :class_name => 'Message', :inverse_of => :from_user

And you don't need the foreign_key, Mongoid will take care of it

answered Sep 27, 2013 at 9:47

Santhosh

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1 Comment

Vasia Pupkin Over a year ago

Thanks. But sorry, Mongoid not take care of it without foreign_key. I pointed foreign_key and this working well.

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