Models for http://stackoverflow.com/questions/20599679

gistfile1.rb

class Description < ActiveRecord::Base
  belongs_to :user
  belongs_to :product
  belongs_to :document
  # attr_accessible :title, :body
  
  validate :check_limit
  
  def check_limit
    if self.class.where(:user_id => self.user_id).count >= 1
      msg = "You have reached your limit"
      self.errors.add(:user_id, msg)
    end
  end
  
end

class Document < ActiveRecord::Base
  belongs_to :user
  attr_accessible :document_number, :product_ids
  
  has_many :descriptions, {
    :dependent => :destroy,
    :before_add => [:add_user_id_to_description, :validate_description]
  }
  has_many :products, :through => :descriptions
  
  def add_user_id_to_description(d)
    d.user_id = self.user_id
  end
  
  def validate_description(d)
    unless d.valid?
      d.errors[:user_id].each do |err|
        self.errors.add(:base, "Doc error: #{err}")
      end
    end
  end
  
end

class Product < ActiveRecord::Base
  belongs_to :user
  attr_accessible :product_number, :document_ids
  
  has_many :descriptions, {
    :dependent => :destroy,
    :before_add => [:add_user_id_to_description, :validate_description]
  }
  has_many :documents, :through => :descriptions
  
  def add_user_id_to_description(d)
    d.user_id = self.user_id
  end
  
  def validate_description(d)
    unless d.valid?
      d.errors[:user_id].each do |err|
        self.errors.add(:base, "Doc error: #{err}")
      end
    end
  end
  
end

class User < ActiveRecord::Base
  attr_accessible :description, :user_name
  
  has_many :products, :dependent => :destroy
  has_many :documents, :dependent => :destroy
  has_many :descriptions, :dependent => :destroy
  
end