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Nested form - how to add an existing nested object to the parent form?

I have installed my many-to-many models:

class Workshop < ActiveRecord::Base
  has_many :workshop_students
  has_many :students, :through => :student_workshops

  accepts_nested_attributes_for :students
end

class Student < ActiveRecord::Base
  has_many :student_workshops
  has_many :workshops, :through => :student_workshops

  accepts_nested_attributes_for :products
end

class StudentWorkshop < ActiveRecord::Base
  belongs_to :student
  belongs_to :workshop
end

As you can see above, a student can have many seminars, and there can be many students in a workshop.

I looked at the following Rails tracks: here and here . And most of the Internet sources I come across only show how to make nested forms to create new objects in the parent form.

I do not want to create a new object. I want to add an existing object to the parent form. For example. If I decide to create a new workshop, I would like to appoint existing students to the workshop.

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- , .

+3
2

, , . , , def. POST student_ids,

0

:

<%= f.collection_select(:student_ids, Student.all, :id, :name, {:include_blank => true}, {:selected => @workshop.student_ids, :multiple => true} )%>

create.

+5

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