ruby-on-rails - 显示委托(delegate)属性的验证错误

Question

我有以下内容(其中 Venue 是 Actor 的 CTI 后代):

class Actor < ActiveRecord::Base
  has_one :profile, validate: true, autosave: true
end

class Venue < ActiveRecord::Base
...
  %w{description address website phone}.each do |attr|
    delegate attr.to_sym, "#{attr}=".to_sym, to: :profile!
  end

  def profile!
    actor.profile || actor.build_profile
  end
...
end

我将这些委托(delegate)属性的字段直接包含在 Venue 表单中。当这些属性之一未通过验证时，我所看到的只是顶部的通知，而不是该字段周围的包装器。我想这一定是因为 Venue 实例的错误散列中的键与属性名称不完全匹配，被设置为 :"actor.profile.website" 而不仅仅是 :website 。

有什么方法可以使这些错误正确显示吗？

编辑

这是表格:

<%= simple_form_for @venue do |f| %>
  <%= f.error_notification %>

  <%= f.input :name %>
  <%= f.input :address, required: true %>
  <%= f.input :phone %>
  <%= f.input :website %>
  <%= f.input :members, collection: [], class: "form_tag" %>
  <%= f.input :tag_list, as: :string, class: "form_tag", hint: t("misc.hint.tag"),
              input_html: { "data-pre" => @venue.tag_list.map {|t| { id: t, name: t }}.to_json } %>
  <%= f.input :description, as: :text, input_html: {rows: 6, cols: 53, class: "form_tag"} %>

  <div class="actions center">
<%= f.submit class: "btn btn-success" %>

Answer 1

module OtherValidation
  extend ActiveSupport::Concern

  module ClassMethods
    def delegate_with_validations(*attr_names)
      options = attr_names.extract_options!
      delegate *attr_names, options
      attr_names.each {|a| validate_using(options[:to], a)}
    end      

    def validate_using(target, *args)
      options = args.extract_options!
      args.each do |attr_name|
        class_eval <<-EOV
          dup = #{target}._validators[:#{attr_name}].dup
          validate do
            dup.each do |v|
              validator = v.dup
              validator.attributes.delete(:#{attr_name})
              validator.attributes << :#{options[:to]||attr_name}
              validator.validate(self)
            end
          end
        EOV
      end
    end
  end

end

现在在 Venue 模型中:

class Venue < ActiveRecord::Base
  include OtherValidation
  delegate_with_validations :website, :to => :profile!
end

# venue = Venue.new(:website => nil)
# venue.valid? # Profile validates presence of :website
#=> false
# venue.errors
#=> #<ActiveModel::Errors....., @messages={:website=>["can't be blank"]}>

---

更新:

对于任何自定义属性:

class Venue < ActiveRecord::Base
  include OtherValidation
  attr_accessor: title

  validate_using("Profile", :website, :to => :title)
end

# :website validation behavior constraints to :title attribute

# venue = Venue.new(:title => nil)
# venue.valid? # Profile validates presence of :website
#=> false
# venue.errors
#=> #<ActiveModel::Errors....., @messages={:title=>["can't be blank"]}>

config/initializers/other_delegation.rb

module OtherValidation
  ...
end

ActiveSupport.on_load :active_record do
  include OtherValidation
end