protocols.rb

class ProtocolsController < ApplicationController
  respond_to :json

  before_action :set_protocol, only: [:show, :update, :destroy]

  def index
    respond_with @protocols = Protocol.ordered
  end

  def show
    respond_with @protocol
  end

  def create
    respond_with @protocol = Protocol.create(protocol_params)
  end

  def update
    @protocol.update(protocol_params)
    respond_with @protocol
  end

  def destroy
    @protocol.destroy
    respond_with @protocol
  end

private

  def protocol_params
    params.require(:protocol).permit(:protocol_number, :title, :pi_name)
  end

  def set_protocol
    @protocol = Protocol.find(params[:id])
  end

end