Rails 3.2 Create Parent Model from Child View

Question

I\'m having a difficult time understanding how to do this. I have two models, a project, and a course.

#project.rb
belongs_to :course
attr_accessible :course_id,         


        

Answer 1

You should be using the form builder to build out your object, rather than just fields_for by itself.

You have this:

= fields_for :course do |builder|

Where you should have this:

= f.fields_for :course do |builder|

The difference is that by calling it on the initial form builder, Rails will check to see if there is a course_attributes= method on the object from the initial form_for call (in this case, that'd be @project) and if there is then it'll define the fields inside this form as being course_attributes.

Go ahead and inspect the form before and after this change, just to see. I'll wait.

This is made possible by the accepts_nested_attributes_for call in your model. It's this method that defines the course_attributes= method that allows for the nested attributes to work. Once you create the project, it should then also create the course.

Also, no need to make course_id an accessible attribute, as your form's not going to be setting that.