Rails has_one关联

Question

I have three models:

class User < ActiveRecord::Base
  has_many :basiccases
end

class Basiccase < ActiveRecord::Base
  belongs_to :user
  belongs_to :form3_c
end

class Form3C < ActiveRecord::Base
  has_one :basiccases
end

How can I add a new Form3C to the Basiccase ? Do I need to use a Basiccase controller or Form3C controller to create a form? If I use Form3cController how can I set the foreign key in the BasiccaseController?

Answer 1

Relationships like has_one are defined on models rather than controllers. I think you want this (to be able to add a Form3c to a Basiccase --not sure which direction you want the relationship to go):

class Form3c < ActiveRecord::Base
  belongs_to :basiccase
end

class Basiccase < ActiveRecord::Base
  belongs_to :user
  has_one :form3c
end

For tips on building the controller and form (view), look at this Rails tutorial , starting around section 6.

Answer 2

Though your naming of model is not that convincing, I am assuming your basiccases table has one column form3c_id .

You need to create a form for form3c object then in controller you can build a basiccase object like @form3c_build_basiccase which will automatically take form3c_id as a foreign key. Refer to this rails cast .

Or you may go for form3c model accepts_nested_attributes_for :basiccase . See about it here .