普通のCSVアップロードフォームを作りたいclass CreateUsers < ActiveRecord::Migration! def change! create_table :users do |t|! t.string :first_name, null:false! t.string :last_name, null:false! t.string :email, null:false! t.timestamps! end! ! add_index :users, :email, unique: true! end! end 6TFST class Admin::UsersController < ApplicationController! def index! end! ! def upload! f = params[:data_file]! flash[:notice] = 'Upload successful
