Rails 3-通过控制器显示has-one属于的所有错误。

Question

我开发了RoR应用程序，遇到了一些我无法解决的问题。我有两个模型-用户和教师。

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

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

同时，我也有关于填写用户和教师资料的表格。在提交此表单中的数据后，将采用我的控制器- create_teacher.的其他方法。此外，我还有其他方法new_teacher，在这个方法中，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)如何显示所有错误(供用户和教师使用)？这有可能吗？

2)当我从admins_new_teacher_path方法重定向到create_teacher时，是否有可能将数据保存在表单中？

Answer 1

我找到了正确的解决办法。为此，我们应该使用accepts_nested_attributes_for。然后，当我们创建模型的时候

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

在这里，我们得到了user.errors的所有错误。

Answer 2

在视图页面上，可以使用form.object.errors检查代码

对于表单对象f，在侧窗体中使用f.object.errors作为表单对象生成器，builder.object.errors在窗体的一侧。

并在控制器上执行render :action => :new_teacher

要获得对象，可以将<%=debug(form.object.errors)%>编写为引用

Answer 3

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