その他のedit new create update destroyを動作させるように
修正する。

/app/controllers/main_controller.rb

class MainController < ApplicationController

  def index
    @member = Member.find(:all)
  end

  def show
    @member = Member.find(params[:id])
  end

  def edit
    @member = Member.find(params[:id])
  end

  def new
    @member = Member.new
  end

  def create
    @member = Member.new(params[:id])
    @member.save
  end

  def update
    @member = Member.find(params[:id])
    @member.attributes = params[:member]
    @member.save
  end

  def destroy
    @member = Member.find(params[:id])
    @member.destroy
  end
end