CODEWITHSUNDEEP
ruby-on-railsmodeldelegationmodel-associations
eMgz
eMgz

Reputation: 708

Rails 3 - Model association (composition) and method delegation

I have the following models and associations:

class JuridicalPerson < ActiveRecord::Base
end

class Supplier < ActiveRecord::Base
  belongs_to :juridical_person
  delegate  :company_name, :company_name=, :to => jurirical_person
end

The controler is:

def new
  @supplier = Supplier.new                                                                                                                                                 

  respond_to do |format|
    format.html # new.html.erb
    format.json { render json: @supplier }
  end
end

The schema looks as follow:

create_table "suppliers", :force => true do |t|
  t.integer  "juridical_person_id"
  ...
end

create_table "juridical_people", :force => true do |t|
  t.string   "company_name"
  ...
end

Now when I try to render it in a view, I get the following error:

Supplier#company_name delegated to juridical_person.company_name, but juridical_person is nil: #(Supplier id: nil, juridical_person_id: nil, created_at: nil, updated_at: nil)

Extracted source (around line #9):

8:       <%= f.label :company_name, "Company Name" %>
9:       <%= f.text_field :company_name %>

Seems like the associated juridical_person is not being created at the time of delegation, but I can't figure out why. Even if I create it in the controller, the app will break when trying to update for the same reason. What am I missing?

Upvotes: 3

Views: 528

Answers (2)

Amir Rubin
Amir Rubin

Reputation: 860

class JuridicalPerson < ActiveRecord::Base
    has_many :suppliers
end

Upvotes: 0

Salil
Salil

Reputation: 47532

remove = Change

delegate  :company_name, :company_name=, :to => jurirical_person

To

delegate  :company_name, :company_name, :to => jurirical_person

Upvotes: 0

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