在联接表中创建新记录

Question

I have a model called Notifications, which basically acts as a join table between Requests and Accommodations.

In my "create" method in my Requests controller, I have:

   # find associated accommodations, currently matching: location
    @accommodations = Accommodation.where('location' => :location)
    @accommodations.each do |accommodation|
      @notification = @request.notification.build('accommodation_id' => accommodation.id ).save
    end

Which doesn't seem to be creating a new Notification record. What am I doing wrong here?

models/accommodation.rb

class Accommodation < ActiveRecord::Base
  validates_presence_of :title, :description, :thing, :location, :spaces, :price, :photo
  attr_accessible :photo_attributes, :title, :description, :thing, :location, :spaces, :price
  has_one :photo
  has_many :notifications
  belongs_to :user
  accepts_nested_attributes_for :photo, :allow_destroy => true
end

models/notification.rb

class Notification < ActiveRecord::Base
  attr_accessible :accommodation_id, :request_id
  has_one :request
end

models/request.rb

class Request < ActiveRecord::Base
  attr_accessible :firstname, :lastname, :email, :phone, :datestart, :dateend, :adults, :children, :location, :status
  validates_presence_of :firstname, :lastname, :email, :phone, :datestart, :dateend, :children, :adults, :location
  has_many :notifications
end

Answer 1

@request.notification.build should be @request.notification s .build since a request has_many notifications.

Also, you're setting @notification to become the value of what the .save returns which will only be true or false . You might want to use create if you want @notification to point to the actual object. Additionally, you probably already know that it's going to keep overwriting the @notification variable on every iteration, which you may or may not want.

There's a lot to be said about the example provided, I think the implementation is entirely poor. But that's not relative to the question of why the notification record isn't saving.

Answer 2

You don't define @request or :location in your controller. Assuming it's a Request object:

@notifications = Array.new

@accommodations = Accommodation.where('location' => :location)
Accommodation.find_each(:conditions => { 'location' => :location }) do |a|
  notification = @request.notifications.create('accommodation_id' => a.id)
  @notifications << notifications
end

Just like @AnomalousThought said:

There's a lot to be said about the example provided, I think the implementation is entirely poor. But that's not relative to the question of why the notification record isn't saving.