rails_admin更改belongs_to下拉菜单以显示不同字段的选项 [英] rails_admin Change belongs_to Drop-down to Display Options from Different Field

问题描述

我正在使用 rails_admin 0.6.5 与 Rails 4.1.6 并拥有一个 has_many / belongs_to 分别在卷和问题模型之间的关联设置：

I am using rails_admin 0.6.5 with Rails 4.1.6 and have a has_many / belongs_to association setup between the Volume and Issue models respectively:

class Volume < ActiveRecord::Base
  has_many :issues, :inverse_of => :volume

  validates :number, presence: true, numericality: {greater_than_or_equal_to: 1}
end

和问题模型：

class Issue < ActiveRecord::Base
  belongs_to :volume, :inverse_of => :issues

  validates :number, presence: true, numericality: {greater_than_or_equal_to: 1}
  validates :date, presence: true
end

在 rails_admin 界面中，它可以工作，但创建或编辑问题时，卷下拉菜单中填充了文本卷＃1 ，卷＃2 ，卷＃3 （每个作为单独的选项）。那些卷号对应于：volume_id ，而不是卷的：number 字段，它与ID和因此对用户感到困惑。

Within the rails_admin interface, it works but when creating or editing an Issue, the Volume drop-down menu is populated with the text Volume #1, Volume #2, Volume #3 (each as a separate option). Those "volume numbers" correspond to :volume_id, not the Volume's :number field, which is different than the ID and therefore confusing to users.

创建或编辑问题时，如何控制在 belongs_to 关联下拉菜单？感谢您提前提供的任何帮助。

When creating or editing an Issue, how do I control which Volume column is displayed in the belongs_to association drop-down menu? Thank you in advance for any help provided.

推荐答案

Rails管理员会查看您的模型中的某些属性以进行显示。有一个数组RailsAdmin.config.label_methods包含这些属性按照首选项。

Rails Admin looks for certain properties on your model for display purposes. There is an array RailsAdmin.config.label_methods that contains these properties in order of preference.

默认情况下，它们是[：name，：title]

By default they are [:name, :title]

我喜欢将：display_name添加到列表的前端，以便我可以轻松地覆盖在数据库上具有名称列的任何模型。

I like to add :display_name to the front of the list so that I can easily override any models that have a name column on the db.

为了做到这一点，将以下行添加到 config / initializers / rails_admin.rb

In order to do this, add the following line to config/initializers/rails_admin.rb

config.label_methods.unshift(:display_name)

然后，在你的模型中：

    class Volume < ActiveRecord::Base

      has_many :issues, :inverse_of => :volume

      validates :number, presence: true, numericality: {greater_than_or_equal_to: 1}

      def display_name
        "Volume #{self.number}"
      end

    end

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