CODEWITHSUNDEEP
ruby-on-rails
DashControl
DashControl

Reputation: 284

Update Another Model's Attribute Rails

So I have two models, call them Animal and AnimalComment. They look like this:

class AnimalComment < ActiveRecord::Base
  attr_accessible :comment, :num
end

class Animal < ActiveRecord::Base
  attr_ accessible :species, :comment
end

I when ever I create a comment in Animal I would like it to add that comment into the :comment field of my AnimalComment Model.

My vision of how this works is I type in a comment in my animals/new webpage, and when I click Submit The comment get's added as a field inside my AnimalComment webpage and is displayed there.

Hope this makes sense. Any ideas?

Upvotes: 1

Views: 662

Answers (2)

Powers
Powers

Reputation: 19308

I am not sure it makes sense to have the same data stored in two places. Perhaps the models should be related (i.e. an Animal has_many Comments).

In any case, your requirement can be satisfied with a callback. 

class Animal < ActiveRecord::Base
  attr_accessible :species, :comment
  after_save :create_animal_comment

  def create_animal_comment
    AnimalComment.create(comment: self.comment)
  end
end

The after_save method tells Rails to run the Animal#create_animal_comment method every time an Animal record is created. self.comment refers to the comment in the Animal model.

Upvotes: 4

Anil
Anil

Reputation: 3919

First, create associations. Then save the comment only in the AnimalComment table. Use delegate in the Animal model to access it, or get it through the association.

Upvotes: 1

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