Rails：如何在没有模型名称，关联名称的情况下显示错误消息

Question

I'd like to display error message without model name, association name.

For example, the following error was displayed,

Rooms events base To time must be after from tim

But I'd like to display only To time must be after from time .

The validate in my model is as followings;

validate do |e|
  if e.start_at.present? && e.end_at.present? and e.start_at > e.end_at
    errors[:base] << "To time must be after from time"
  end
end

It would be appreciated if you could give me how to display only To time must be after from time .

application.html.erb

    <% flash.each do |message_type, message| %>
      <%= content_tag(:div, message, class: "alert alert-#{message_type}") %>
    <% end %>

SOLVED!

It works when I set the followings in en.yml

en:
  errors:
    format: "%{message}"

Answer 1

Add the following in your application.html above yield

<% flash.each do |key, value| %>
      <div class="alert alert-<%= key %>"><%= value %></div>
<% end %>

Answer 2

errors is a hash. The key is the name of the field name or :base and the value is an array of your error messages as strings.

values on a hash will return an array of the values without the keys. Because the value in this hash is an array, we end up with an array of arrays: [['To time must be after from time']]

I use flatten to squash all of the nested arrays to a single top level array.

join("\\n") will join all of the array elements into a single string, separated by a newline character.

Put it all together and you get something like this:

flash[:error] = @object.errors.values.flatten.join("\n")

http://api.rubyonrails.org/classes/ActiveModel/Errors.html#method-i-values