将错误条件移出视图。(Moving error conditionals out of the view.

将错误条件移出视图。(Moving error conditionals out of the view. -Rails)

我有一个名称为文本字段的表单，它有一个在线验证。 当用户忘记输入名称时，文本字段会变成红色，这很好，但我想清理一下我的视图，但我不确定如何？ 也许是帮手？ 也许是一种方法？ 我有点新的轨道，我正在寻找这个问题的一些建议。 这是我的视图代码。

视图

<% if f.object.errors[:name].present? %> <%= f.text_field :name, :class => 'alert' %> <div class="validation"> <% f.object.errors[:name].each do |error| %> <%= error %> <% end %> </div> <% else %> <%= f.text_field :name %> <% end %>

这是一个非常标准的说法，但是我认为它对于视图来说有点太难看了。

I have a form that has a text field for name, it has a presence validation on it. When a user forgets to input the name the text field turns red this is all fine but I'd like to clean up my view a little bit but I'm not sure how? Maybe a helper? Maybe a method? I'm a bit new to rails and I'm looking for some advice on this problem. Here is my code for the view.

VIEW

<% if f.object.errors[:name].present? %> <%= f.text_field :name, :class => 'alert' %> <div class="validation"> <% f.object.errors[:name].each do |error| %> <%= error %> <% end %> </div> <% else %> <%= f.text_field :name %> <% end %>

It's a pretty standard if else statment but I'd think its a little too ugly for the view.

最满意答案

您可以使用模型验证获得类似的结果。 如果您需要在模型上进行在场验证，那么它会告诉用户该字段不能为空。 这可以让你告诉用户他们不能将表单字段留空，而无需在视图中手动编码。

示例：发布模型 - app / models / post.rb

class Post < ActiveRecord::Base validates :title, :presence => true validates :body, :presence => true end

如果用户现在尝试将标题或正文的表单提交为空，那么他们将被要求重新提交表单，并附带一个小工具提示“请填写此字段”。

视图中不需要任何逻辑来实现这一点，只需验证模型中的存在即可。

You can achieve a similar result using your model validation. If you require a presence validation on a model, then it will tell the user the field cannot be blank. This would allow you to tell the user they cannot leave a form field blank without manually coding this in your views.

Example: Post Model - app/models/post.rb

class Post < ActiveRecord::Base validates :title, :presence => true validates :body, :presence => true end

If the user now attempts to submit the form with either Title or Body empty then they will be asked to resubmit the form, with a little tool tip saying "Please fill out this field".

No logic is needed in the view to achieve this, simply validate presence in your model.