ruby-on-rails - 验证不起作用？

Question

我是 ruby​​ 新手，喜欢语法！但是我一直收到这个错误，有人可以告诉我为什么吗？我也确实尝试将它包含在 include ActiveModel::Validations 中，但没有任何运气。让这个“堆栈级别太深”

class HomeController < ApplicationController
 def index

 if params[:username]
     l = Users.new(:username => params[:username], :password => params[:password], :email => params[:email]).save
     z = Users.where(:username => params[:username]).limit(1).last
     @debugging = "Howdy" + z[:username] + ""
 end
end
end

用户型号：

class Users < ActiveRecord::Base
validates :username, :presence => true

  attr_accessible :email, :password, :username
end

Answer 1

如果您正在使用它应该在您的模型中active record：

 validates :username, :presence => true

它应该是User < ActiveRecord::Base：

用户.rb

class User < ActiveRecord::Base
  validates :username, :presence => true  #or you can also write as 'validates_presence_of :username'

  attr_accessible :email, :password, :username
end

home_controller.rb

class HomeController < ApplicationController
  def index
    if params[:username]
     l = User.new(:username => params[:username], :password => params[:password], :email => params[:email])
     if l.save?
       flash[:success] = "Valid user"
     else
       flash[:error] = "Invalid user"
     end

     z = User.where(:username => params[:username]).limit(1).last
     @debugging = "Howdy" + z[:username] + ""
    end
  end
end

Answer 2

你的模型看起来不错

尝试为此更改您的索引操作：

if params[:username]
  user = User.create(:username => params[:username], :password => params[:password], :email => params[:email])
  if user.persisted?
    @debugging = "Howdy #{user.username}"
  else
    @debugging = "Error while creating user"
  end
end

如果用户无效，User.create将创建一个未保存在数据库中的用户对象