accept nested attributes for has_many relationship

Question

Below are my two model classes

class Patient < ActiveRecord::Base
  belongs_to :user, :dependent => :destroy
  has_many :enrollments, :dependent =>          


        

Answer 1

Instead of

:client_id

in the collection_select, try

"client_id[]"

The second form specifies that you're accepting an array of IDs for the attribute rather than a single one.

Here's a good resource on the usage of the select helpers in forms: http://shiningthrough.co.uk/Select-helper-methods-in-Ruby-on-Rails