CODEWITHSUNDEEP
ruby-on-railsruby
Eldar
Eldar

Reputation: 118

Why do new instances of controller have the same object_id?

I have the following code:

class ArticlesController < ApplicationController
  def new
    p self.class.object_id
    @article = Article.new
  end

  def create
    p self.class.object_id
    @article = Article.new(article_params)
    if @article.save
      redirect_to @article
    else
      render 'new'
    end
  end

  private

  def article_params
    params.require(:article).permit(:title, :text)
  end
end

Rails creates a new instance of controller per request, so I supposed them to have different object ids. However, self.class.object_id returns the same value within new and create actions. Why is that the case?

Upvotes: 0

Views: 99

Answers (3)

mechnicov
mechnicov

Reputation: 15298

When you write self.class.object_id, you are asking the object_id of your class ArticlesController, not instance. Of course, they will be the same.

Try self.object_id or just object_id, and you will see that they are different.

Upvotes: 4

Herminio Torres
Herminio Torres

Reputation: 9

Because the referent of self is an object of ArticlesController, when you started the server, ArticlesController is assigned an object_id. When you call it in context of the class, it returns the same object_id each time.

Upvotes: 0

Bijendra
Bijendra

Reputation: 10043

In actions new and create, the object has not changed.

self.class

The same number will be returned on all calls to object_id for a given object, and no two active objects will share an id.[Object_id]

Upvotes: 0

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