has_many和belongs_to在rails中不起作用

Question

I have created two models 1) Contact 2) Customer in my Rails application, now I want to join the two tables of these models. Tables are contacts & customers respectively. I am using following code:

1) contact.rb:

class Contact < ActiveRecord::Base
  unloadable
  has_many :customers
end

2) customer.rb

class Customer < ActiveRecord::Base
  belongs_to :contact, :foreign_key => :contact_id`
end

3) customers_controller.rb

def new
  @customer = Customer.new
  @customer = Customer.find(:all,:include => :contact_id)
end

Here I am trying to access the primary key of contact table into customer table but it repeatedly gives this error "Association named 'contact_id' was not found; perhaps you misspelled it?" Can any one help me on this?

Answer 1

When you use include , you should pass in the association name (in your case " contact ") rather than the foreign key.

However, your description doesn't make clear that this is what you want to do, so if you can clarify your question I'll update this answer if it's wrong

Answer 2

If I clearly understand you don't need to pluralize customer in the contact model :

class Contact < ActiveRecord::Base
  unloadable
  has_many :customers
end

And you don't need to specified the name of the column who contain the foreign key

(sorry for my english)