Rails 3.1 limit user created objects

Question

I would like to limit the number of model Objects a user can create. I've tried the below but it is not working. I understand some changes have happened in rails 3.1 and not sure how to accomplish this now.

class User < ActiveRecord::Base
  has_many :things, :limit => 5, :dependent => :destroy # This doesn't work
end

class Things <ActiveRecord::Base
  belongs_to :user
end

Alex Peattie · Accepted Answer · 2011-10-23T01:44:56.017

17

Try something like this:

class User < ActiveRecord::Base
  has_many :things
end

class Things <ActiveRecord::Base
  belongs_to :user
  validate :thing_count_within_limit, :on => :create

  def thing_count_within_limit
    if self.user.things(:reload).count >= 5
      errors.add(:base, "Exceeded thing limit")
    end
  end
end

Edit: updated for Rails 3

edited Oct 23 '11 at 01:44

answered Oct 23 '11 at 00:58

Alex Peattie

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I'm using Rails 3.1 and getting "undefined method `validate_on_create' for #" – user892583 Oct 23 '11 at 01:38
Great! Please go ahead and accept the answer if it did a good job of addressing your question :) – Alex Peattie Oct 23 '11 at 18:16
I am wondering how would you count only things with a specific attribute value, e.g. thing.status = 'published'? – Maxim Zubarev Nov 16 '13 at 21:41
This is not concurrent safe – Edward Jun 09 '15 at 18:43

sekrett · Answer 2 · 2013-02-13T14:36:33.820

3

It did not work on Rails 3.2.1. Count always equals to 0. I have replaced it with self.user.things.size and now it works.

edited Feb 13 '13 at 14:36

answered Feb 22 '12 at 17:27

sekrett

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Rails 3.1 limit user created objects

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