1

我开发了 RoR 应用程序，但遇到了我无法解决的问题。我有 2 个模型 - User和Teacher。

class User < ActiveRecord::Base
  ...
  has_one :teacher
  accepts_nested_attributes_for :teacher 
end

class Teacher < ActiveRecord::Base
  ...
  belongs_to :user
end

我还可以查看用户和教师填写数据的表格。从此表单提交数据后，进入我的控制器的其他方法 - create_teacher。我还有其他方法new_teacher，在这种方法中，我对表单有自己的看法。

class AdminsController < ApplicationController
  def new_teacher
    @user = User.new
    teacher = @user.build_teacher
  end

  def create_teacher
    params[:user][:user_role] = "teacher"
    user = User.new(params[:user])

    if user.valid?
      user.save
      teacher = user.build_teacher( params[:user][:teacher_attributes] )
      if teacher.valid?
        teacher.save
        redirect_to admins_users_of_system_path
        flash[:success] = "Teacher created!"
      else
        redirect_to admins_new_teacher_path
        flash[:error] = teacher.errors.full_messages.to_sentence
        user.destroy
      end
    else
      redirect_to admins_new_teacher_path
      flash[:error] = user.errors.full_messages.to_sentence
    end
  end
end

我的观点new_teacher.html.erb

<%= form_for @user, :url => create_teacher_url, :html => {:class => "form-horizontal"} do |f| %>
  <%= field_set_tag do %>
    <%= f.fields_for :teacher do |builder| %>
      <div class="control-group">
        <%= builder.label :teacher_last_name, "Last name", :class => "control-label" %>
        <div class="controls">
          <%= builder.text_field :teacher_last_name %>
        </div>
      </div>

      ...
    <% end %>


    <div class="control-group">
       <%= f.label :user_login, "Login", :class => "control-label" %>
        <div class="controls">
          <%= f.text_field :user_login, :value => "" %>
          <%= link_to_function "Generate login", "generate_login()", :class => "btn" %>
        </div>
    </div>
      ...
  <% end %>

    <%= f.submit "Create", :class => "btn btn-large btn-success" %>
<% end %>

我有两个问题：

1) 我如何显示所有错误（针对用户和教师）？那可能吗？

2) 当我从create_teacher方法重定向到admins_new_teacher_path时，是否可以将我的数据保存在表单中？

4

4 回答 4

2

在查看页面上，您可以使用form.object.errors 检查代码

对于表单对象 f在嵌套表单中使用f.object.errors表单对象构建器builder.object.errors

render :action => :new_teacher并在控制器上做一个

要获取对象，您可以编写<%=debug(form.object.errors)%>作为参考

于 2012-03-15T12:00:56.903 回答
0 
def create_teacher
  user_errors, teacher_errors, redirect_path = nil, nil, nil 

  params[:user][:user_role] = "teacher"
  user = User.new(params[:user])

  if user.save
    redirect_path = admins_users_of_system_path
    flash[:success] = "Teacher created!"
  else
    redirect_path = admins_new_teacher_path
    user_errors = user.errors.full_messages.to_sentence
    teacher_errors = user.teacher.errors.full_messages.to_sentence if user.teacher
  end

  errors_arr = [user_errors, teacher_errors].compact
  flash[:error] = "Errors for user: \n" + errors_arr.join("\n Errors for teacher") if errors_arr.present? 
  redirect_to redirect_path
end
于 2012-03-15T10:41:56.023 回答
0

例如，您可以验证模型中的 teacher_last_name 字段：

validate :ensure_teacher_exists

def ensure_teacher_exists
  unless Teacher.find_by_teacher_last_name(teacher_last_name)
    errors.add(:teacher_last_name, "does not exist")
  end
end

然后你必须在你的视图中添加：

<%= builder.error_message_on :teacher_last_name %>

这将在字段附近显示错误消息。

如果遇到“未定义方法”错误，请将以下方法添加到 config/initializers/form_builder.rb

def error_message_on(attr)
  message = Error.message(object, attr)
  @template.content_tag(:div, message, :class => 'error_message') if message.present?
end
于 2012-03-15T12:58:28.777 回答
0

我找到了正确的解决方案。为此，我们应该使用accepts_nested_attributes_for。然后，当我们创建模型时这样做

user = User.new( params[:user] ) # Using nested attributes in our model
if user.save
   ..
else
   all_errors = user.errors 
end

在这里，我们得到所有错误user.errors。

于 2012-03-20T12:24:27.670 回答