空参数 - 形式

Question

我想实现重设密码功能，所以我遵循了 this railscast，我收到带有 link 的邮件以重定向到编辑密码页面，但我在这里收到错误消息。

查看

<h1>Reset Password</h1>

<%= form_for @user, :url => password_reset_path(params[:id]) do |f| %>
  <% if @user.errors.any? %>
    <div class="error_messages">
      <h2>Form is invalid</h2>
      <ul>
        <% for message in @user.errors.full_messages %>
          <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>
  <div class="field">
    <%= f.label :password %>
    <%= f.password_field :password %>
  </div>
  <div class="field">
    <%= f.label :password_confirmation %>
    <%= f.password_field :password_confirmation %>
  </div>
  <div class="actions"><%= f.submit "Update Password" %></div>
<% end %>

错误是：First argument in form cannot contain nil or be empty

我假设@user 为空，我是 RoR 的新手，我不知道为什么会收到此错误

密码控制器

class PasswordResetsController < ApplicationController
  def new
    render :layout => false
  end
  def create

    user = User.find_by_email(params[:email])
    user.send_password_reset if user
    redirect_to :connect, :notice => "An E-mail has been send"
  end
  def edit
    render :layout => false
    @user = User.find_by_password_reset_token!(params[:id])
  end
  def update
  @user = User.find_by_password_reset_token!(params[:id])
  if @user.password_reset_sent_at < 2.hours.ago
    redirect_to new_password_reset_path, :alert => "Password &crarr; 
      reset has expired."
  elsif @user.update_attributes(params[:user])
    redirect_to root_url, :notice => "Password has been reset."
  else
    render :edit
  end
end
end

Answer 1

将您的 def 编辑更改为

def edit
  @user = User.find_by_password_reset_token!(params[:id])
  render :layout => false

end

Answer 2

你必须添加

@user = User.new

你的新方法。

您的创建方法还有另一个错误。没有创建用户。

class PasswordResetsController < ApplicationController
  def new
    @user = User.new
    render :layout => false
  end

  def create
    @user = User.new user_params
    if @user.save
      # your code to render success
    else
      # your code to render error
    end
  end

  private

  def user_params
    params.require(:user).permit(:email) # add more
  end
end

Answer 3

这是对“@user.update_attributes(params[:user])”的回答，其中包含禁止属性错误。

Rails 4 具有称为 strong parameters 的新功能。将您的密码控制器更改为：

class PasswordResetsController < ApplicationController
  def new
    render :layout => false
  end
  def create

    user = User.find_by_email(params[:email])
    user.send_password_reset if user
    redirect_to :connect, :notice => "An E-mail has been send"
  end
  def edit 
    @user = User.find_by_password_reset_token!(params[:id])
    render :layout => false
  end
  def update
  @user = User.find_by_password_reset_token!(params[:id])
  if @user.password_reset_sent_at < 2.hours.ago
    redirect_to new_password_reset_path, :alert => "Password &crarr; 
      reset has expired."
  elsif @user.update_attributes(user_params)
    redirect_to root_url, :notice => "Password has been reset."
  else
    render :edit
  end
end


  private

  def user_params
    params.require(:user).permit(:name, :email_id, :password)
  end

end

空参数 - 形式

Empty argument - form for

passwords

ruby-on-rails