Ruby on Rails 中的 form_for 错误消息
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form_for error messages in Ruby on Rails
提问by Kyle Decot
What is the preferred way to display validation error messages using form_forin Rails 4?
form_for在 Rails 4 中显示验证错误消息的首选方法是什么？
<%= form_for @post do |f| %>
...
<% end %>
采纳答案by Jesse Wolgamott
Same as Rails 3 -- see f.error_messages in Rails 3.0or http://railscasts.com/episodes/211-validations-in-rails-3for many different possibilities.
与 Rails 3 相同——请参阅Rails 3.0 中的 f.error_messages或http://railscasts.com/episodes/211-validations-in-rails-3以了解许多不同的可能性。
My personal preference is to use simple_form and have it put the error next to the input.
我个人的偏好是使用 simple_form 并将错误放在输入旁边。
回答by Danny
This is how I am displaying them for my form object called @location:
这就是我为我的表单对象显示它们的方式 @location:
<% if @location.errors.any? %>
<ul>
<% @location.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
<% end %>
Note: put the above code after the <%= form_for @location do |f| %>line
注意：将上面的代码放在该<%= form_for @location do |f| %>行之后
回答by Wes Foster
My preferred way of doing this and keeping the code simple and DRY, is the following:
我喜欢这样做并保持代码简单和 DRY 的方法如下：
Create a new helper inside of application_helper.rb
在application_helper.rb 中创建一个新的助手
# Displays object errors
def form_errors_for(object=nil)
render('shared/form_errors', object: object) unless object.blank?
end
Create a new shared partial in shared/_form_errors.html.erb
在shared/_form_errors.html.erb 中创建一个新的共享部分
<% content_for :form_errors do %>
<p>
<%= pluralize(object.errors.count, "error") %> prevented the form from being saved:
</p>
<ul>
<% object.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
<% end %>
Edit your application.html.erbfile to include the errors where you want them:
编辑您的application.html.erb文件以包含您想要的错误：
<%= yield :form_errors %>
Finally, place the helper at the start of each form:
最后，将 helper 放在每个表单的开头：
<%= form_for(@model) do |f| %>
<%= form_errors_for @model %>
<%# ... form fields ... %>
<% end %>
This makes it extremelysimple to manage and show your form errors across many forms.
这使得在许多表单中管理和显示表单错误变得非常简单。
回答by jlesse
I know this isn't exactly what was asked, but if you are using the simple_form gem, which I recommend, you can use f.error_notification which takes :message as an option.
我知道这并不完全是所问的问题，但是如果您使用的是我推荐的 simple_form gem，则可以使用 f.error_notification 将 :message 作为选项。
= f.error_notification message: form_errors_for(your_object)
I use a method pretty similar to Wes's answer; form_errors_for inside application_helper.rb
我使用的方法与韦斯的回答非常相似；在application_helper.rb 中的form_errors_for
def form_errors_for_base(object)
if object.errors.messages[:base].present?
object.errors.messages[:base].join(",\n") + "."
else
nil
end
end
