Can't figure out Has_many in select form
class Position < ActiveRecord::Base
  #position attributes
  has_many :educations, :foreign_key => "position_id"


class Education < ActiveRecord::Base
  belongs_to :position

  EDUCATION_CHOICES = ([["Undergrad", "0"],["Master", 1],["PHD", 2]])

<%= f.select(:education_ids, Education::EDUCATION_CHOICES,{ :prompt => "Please select"},
    { :multiple => true, :size => 5 }) %>

<%= f.select(:education_ids, Education::EDUCATION_CHOICES,{ :prompt => "Please select"},
    { :multiple => true, :size => 5 }) %>

@position = Position.new(params[:position])

Processing by PositionsController#create as HTML