已筛选的具有多个关系表单(_M)

Question

我有一个简单的表单来显示具有has_many关系的模型。

  form do |f|
    f.semantic_errors *f.object.errors.keys
    f.inputs do
      f.has_many :messages, allow_destroy: true, heading: 'Messages' do |f|
        f.input :title
      end
    end
    f.actions
  end

我的问题是：如何在显示from之前对消息进行预过滤？它取决于current_admin用户。

Answer 1

NeverBe！

我的解决方案是基于为模型创建一个具有条件的自定义has_many关系。例如：

文件/app/models/key.rb

class Key < ActiveRecord::Base
    attr_accessible :name,
                    :messages, :messages_attributes,
                    :messages_for_organization_attributes 
    has_many :messages, dependent: :destroy
    accepts_nested_attributes_for :messages, allow_destroy: true
    has_many :messages_for_organization, class_name: 'Message', conditions: proc {"organization_id" = #{$current_admin_user.organization_id}"}
    accepts_nested_attributes_for :messages_for_organization, allow_destroy: true
end

文件/app/models/message.rb

class Message < ActiveRecord::Base
    attr_accessible :title,
                    :key, :key_id
                    :organization, :organization_id
    belongs_to :key
    belongs_to :organization
end

文件app/admin/key.rb:

controller do
    def edit
      if current_admin_user.role?('super_admin')
        @key = Key.find_by_id(params[:id])
      else
        @key = Key.joins('LEFT JOIN messages ON messages.key_id = key.id').where(id: params[:id]).first
      end
      $current_admin_user = current_admin_user # Important assignment to get access current_admin_user in Key model class
      edit!
    end
end

form do |f|
    f.semantic_errors *f.object.errors.keys
    f.inputs do
        if current_admin_user.role?('super_admin')
            f.has_many :messages, allow_destroy: true, heading: 'Messages' do |f|
                f.input :title
            end
        else
            f.has_many :messages_for_organization, allow_destroy: true, heading: 'Messages' do |f|
                f.input :title
            end
        end
    end
    f.actions
end