ruby – 为ActiveRecord模型添加可读字段描述
我想在ActiveRecord模型字段中添加说明,作为每个字段的基本说明/示例.基本上是模型元数据.然后我可以在UI中显示这些内容(在表单上的字段旁边等)
我计划这样做的方法就是在模型中创建一个静态哈希表,其中字段名称为键,描述为值.即 FIELD_DESCRIPTIONS = { 'category' => 'Select the category it should appear within.','title' => 'The title should be a short but descriptive summary.','description' => 'Please enter a full description.' } 等等 然后我会创建一个基本的表单帮助器,将这些解释包装在一个span(最初隐藏并通过jQuery显示)中,这样它们就可以通过f.field_description(:title)或沿着这些行的东西进行实例化. 有没有更好的想法?我想将这个字段元数据保存在模型中,因为许多视图可以使用相同的信息,我还认为当你回过头来查看代码时,在模型中有描述是很好的(比如DataMapper可以如何在模型中使用,以指定字段). 为了更详细地介绍一下我已经完成的工作(并且工作正常),这里是代码.我认为必须有一种更漂亮的方式在模型中表达这些描述,所以如果你有任何想法,请告诉我. 在模型中: FIELD_DESCRIPTIONS = { 'category' => 'Select the category it should appear within.','description' => 'Please enter a full description.' } def self.describe_field(field) FIELD_DESCRIPTIONS[field] end 在application_helper.rb中 def field_helper(form,field) "<span class='field_helper'>#{form.object.class.describe_field(field)}</span>" end 在视图中: <%= field_helper(f,'title') %> 这将产生所需的输出: <span class='field_helper'>The title should be a short but descriptive summary.</span> 更新: 好的,这是我根据接受的答案使用的最终代码. 文件:/config/initializers/describe_attr.rb if defined?(ActiveRecord) # let's us add attribute descriptions to each AR model class ActiveRecord::Base def self.describe_attr(*params) attrs = params.shift unless attrs.nil? case attrs when Hash @@attr_descriptions = attrs when Symbol return @@attr_descriptions[attrs] end end @@attr_descriptions ||= {} end end end 文件:/app/models/project.rb describe_attr( :category => 'Select the category the project should appear within.',:title => 'The title should be a short but descriptive summary of the project.',:description => 'Describe the project in detail.',:image => 'Upload an image for the project.' ) 文件:/app/helpers/application_helper.rb # assumes you have a style defined for attr_description def describe_attr(form,attribute) "<span class='attr_description'>#{form.object.class.describe_attr(attribute)}</span>" end 文件:/app/views/projects/_form.html.erb <%= describe_attr(f,:title) %> 解决方法
如果要修补ActiveRecord,那么您可以执行以下操作:
# Add this at the bottom of enviroment.rb class ActiveRecord::Base def self.field_description(*params) attrs = params.shift unless attrs.nil? case attrs when Hash @@field_description = attrs when Symbol return @@field_description[attrs] end end @@field_description ||= {} end end 在模型中,您可以像宏一样添加此行: class Product < ActiveRecord::Base field_description :category => 'Select the category it should appear within.',:title => 'The title should be a short but descriptive summary.',:description => 'Please enter a full description.' end 获得价值 Product.field_description : title (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |