Question

我是ruby on rails的新手，我目前正在开发门户网站的一部分。我遇到了一些我无法找到解决方案的错误。

第一个错误：

ActionController::ParameterMissing (param is missing or the value is empty: user):
app/controllers/admin/manage_users_controller.rb:97:in `user_params'
app/controllers/admin/manage_users_controller.rb:32:in `update'

第二个错误：

ArgumentError (When assigning attributes, you must pass a hash as an argument.):
app/controllers/admin/manage_users_controller.rb:32:in `update'

我的manage_users_controller：

def edit
  if request.format.json?
   t = @user
   @user = {:id => t.id, :email => t.email}
  end
  respond_to do |format|
    format.json { render :json => @user, :status => 200}
    format.html
  end
 end

def update
  @user.attributes = user_params
  if @user.save
   respond_to do |format|
    format.json {render :json => {:redirect_to => admin_manage_users_path}, :status => 200 }
   end
  else
   respond_to do |format|
    format.json { render :json => {:errMsg => print_out_message('form-update','user'), :errors => @user.errors}, :status => 400 } 
   end
  end
 end

 def user_params  
  return params.require(:user).permit(:user_id, :email)
 end

对于第一个错误，我不确定为什么缺少参数。对于第二个错误，我已阅读其他帖子，我需要在user_params中使用require和permit方法。但是，我仍然无法弄清楚究竟是什么问题。

任何帮助都将深表感谢。谢谢。

-------------------------- UPDATE -------------------- ---------

视图中的edit.html.erb

  <div class="row" ng-controller="AdminManageUsersCtrl">
     <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
      <div class="rs-content" data-ng-init="loadUser()">
       <div class="portlet listing" cg-busy="loadUser" ng-cloak>
         <div class="portlet-body">
          <form name="form" ng-submit="uploadUser()" confirm-on-exit>
           <%= render "admin/manage_users/form" %>
           <div class="row row-space-top-1">
            <div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
             <button type="submit" class="btn red-mint" ng-click="form.$setPristine()">Update</button>
             <%= link_to "Cancel".html_safe, admin_manage_users_path, :class => "btn dark btn-outline" %>
             <%= link_to 'Remove', URI::unescape(admin_manage_user_path(:users => '{{user.id}}')), :method => :delete, :class => "pull-right btn red btn-outline", :data => {:confirm => 'Are you sure you want to delete this user?', "ng-click"=>"form.$setPristine()"} %>
            </div>
           </div>
          </form>
         </div>
       </div>
      </div>
     </div>
    </div>

和_form.html.erb

 <div class="col-md-12 space-1" ng-class="{ 'has-error' : form['email'].$invalid }">
  <label class="control-label">Email</label>
  <div>
   <div class="input-icon right">
    <i ng-show="form['email'].$invalid" class="fa fa-warning tooltips" data-original-title="{{errors['email']}}" data-container="body"></i>
    <input ng-model= "user.email" name="email" type="text" class="form-control">
   </div>
  </div>
 </div>

app.js中的

$scope.uploadUser = function() {
  $scope.errors = [];
  AdminManageUsers.$patch('update', $scope.user).then(function(response) {
   $window.location.href = response.redirectTo;
  }, function(response) {
   angular.forEach(response.data.errors, function(errors, key) {
    $scope['form'][key].$invalid = true;
    $scope.errors[key] = errors.join(', ');
   });
   alertMessage.danger(response.data.errMsg, 1, 10000);
  });
 }

这是route.rb中的路由

  resources :manage_users, :only => [:index,:destroy], :param => :id
   match "manage_users/data" => "manage_users#data", via: [:post], :defaults => { :format => 'json' }
   match "manage_users/load" => "manage_users#load", via: [:get], :defaults => { :format => 'json' }
   match "manage_users/:id/edit" => "manage_users#edit", via: [:get]
   match "manage_users/:id/update" => "manage_users#update", via: [:patch]

抱歉，我发布了很多代码，但我认为它们都是相关的。说实话，我实际上是在尝试遵循我的导师采用的编码风格，所以他使用angularJS来设计表单，所以我仍然有一些麻烦理解一切如何联系在一起。

Answer 1

错误本身是由strong_params方法引起的：

params.require(:user).permit(:user_id, :email)

具体来说， require 参数意味着控制器期望一个以"user"为主要元素的params哈希：

params: {
  "user" => {
    "user_id" => "1",
    "email"   => "test@email.com"
  }
}

由于您没有进行上述设置，因此错误消息显示您在params哈希中没有user。

<强>解决方案

确保你通过你的参数传递正确的物体。您应该进行以下设置：

#app/views/admin/manage_users/edit.html.erb
<%= form_for @user do |f| %>
   <%= f.text_field :email %>
   <%= f.submit %>
<% end %>

与此同时，你所做的一切都是有缺陷的;你最好使用以下内容：

#app/controllers/admin/manage_users_controller.rb
class Admin::ManageUsersController < ApplicationController 
   respond_to :js, :json, :html
   before_action :set_user

   def edit
     respond_with @user
   end

   def update
      respond_to do |format|

        if @user.update user_params
          format.json {render :json => {:redirect_to => admin_manage_users_path}, :status => 200 }
        else
          format.json { render :json => {:errMsg => print_out_message('form-update','user'), :errors => @user.errors}, :status => 400 } 
        end

     end
   end

   private

   def set_user
      @user = User.find params[:id]
   end

   def user_params  
       params.require(:user).permit(:user_id, :email) #-> Ruby automatically returns the last line of a method
   end
end

缺少ruby-on-rails参数或值为空（使用angularJS形式时）

1 个答案: