sms-pager/app/controllers/parents_controller.rb

class ParentsController < ApplicationController
  def index
    @parents = Person.just_parents
    respond_with @parents
  end

  def show
    @parent = Person.includes(:children).find_by_id(params[:id])
    @more_children = Child.not_related_to(@parent.id)
  end

  def new
    @parent = Person.new
    3.times { @parent.children.build }
  end

  def add
    @parent = Person.create add_parent_params

    if @parent.persisted?
      redirect_to parent_path(@parent), notice: 'Success!'
      return
    else
      render :new
    end
  end

  def edit
    @parent = Person.includes(:children).find_by_id(params[:id])
    @more_children = Child.all
  end

  private

    def add_parent_params
      params.require(:parent).permit(
        :first_name,
        :last_name,
        :phone,
        :email,
        children_attributes: [:first_name, :last_name]
      )
    end
end