Rails: HasManyThroughAssociationNotFoundError

Question

I have problems with getting a has_many through association to work.

I keep getting this exception:

Article.find(1).warehouses.build
Act         


        

Answer 1

You would need to add

has_many :entries

To each model, and above has_many :through, like this:

class Article < ActiveRecord::Base
  has_many :entries
  has_many :warehouses, :through => :entries
end

class Warehouse < ActiveRecord::Base
  has_many :entries
  has_many :articles, :through => :entries
end

More detailed tutorial on how to handle view and controllers https://kolosek.com/rails-join-table/

Answer 2

You need to add

has_many :entries

To each of your models, since the :through option just specifies a second association which it should use to find the other side.

Answer 3

@Meekohi This means that you have no Entry model. I just received the error message myself, so wanted to point it out (can't post it as a comment due to low reputation).

class Entry < ActiveRecord::Base
  belongs_to :article
  belongs_to :warehouse
end

Simply run

rails g model Entry