Question

我是ruby的新手，喜欢语法！但我一直得到这个错误，有人可以告诉我为什么？我也尝试将它包含在ActiveModel :: Validations中而没有任何运气。获得这个“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

用户模型：

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

  attr_accessible :email, :password, :username
end

Answer 1

如果您使用active record：

，它应该在您的模型中

 validates :username, :presence => true

应为User < ActiveRecord::Base：

<强> user.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

<强> 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

您的模型似乎没问题

尝试为此更改索引操作：

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 将在数据库中创建一个非持久的用户对象

验证不起作用？

2 个答案: