Rails:错误靠近表单中的特定字段 [英] Rails: Errors close to particular fields in forms

问题描述

我正在尝试向导致错误的字段附近的表单中添加一些错误，这就是我的操作方式:

I am trying to add some errors to a form close to the field that caused the error and here is how I am doing this:

 <%= lesson_form.text_field :description %><br />
  <% unless @lesson.errors[:description].blank? %>
    <span id="error_explanation">
      Description <%= @lesson.errors[:description].join(", ") %>
    </span>
  <% end -%>

  <%= lesson_form.label :category %>
  <%= lesson_form.text_field :category %><br />
  <% unless @lesson.errors[:category].blank? %>
    <span id="error_explanation">
      Category <%= @lesson.errors[:category].join(", ") %>
    </span>
  <% end -%>

我想知道是否有更好的非重复性方法.如您所见，除非每个字段都有错误...，否则我将重复相同的操作.

I would like to know if there is a better an non repetitive way of doing this. As you see I am repeating the same unless errors... for each of the fields.

推荐答案

使用辅助方法:

def errors_for(model, attribute)
  if model.errors[attribute].present?
    content_tag :span, :class => 'error_explanation' do
      model.errors[attribute].join(", ")
    end
  end
end

而且在视野范围内:

<%= lesson_form.text_field :description %><br />
  <%= errors_for @lesson, :description %>

  <%= lesson_form.label :category %>
  <%= lesson_form.text_field :category %><br />
  <%= errors_for @lesson, :category %>
<% end %>

或者您也可以使用 simple_form 这样为您完成所有操作:

Or you could use simple_form which will do it all for you like this:

<%= simple_form_for @lesson do |f| %>
  <%= f.input :description %>
  <%= f.input :category %>
  <%= f.button :submit %>
<% end %>

如果您使用simple_form和 haml ，事情看起来会更整洁:

And if you use simple_form and haml, things look a bit neater:

= simple_form_for @lesson do |f|
  = f.input :description
  = f.input :category
  = f.button :submit

以上内容将在该字段旁边显示错误，并将检测属性的类型并显示适当的输入框(例如，文本，密码，复选框等)，所有这些都只需一行简单的f.input.

The above will show the error next to the field and will detect type of the attribute and show the appropriate input box (eg text, password, checkbox etc.), all with one simple line f.input.

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