如何在 Rails 管理关联模型中制作自定义下拉菜单

Question

Rails 管理员 has_many 关联选项下拉自定义

我想在 rails 管理 select 下拉选项中进行一些更改。我有一些模型有 has_many 关系。

模型文件 post.rb

class Post < ApplicationRecord
    has_many :photos, dependent: :destroy
    accepts_nested_attributes_for :photos, allow_destroy: true
    def post_image
       photos&.first&.asset_url
    end
end

photo.rb

class Photo < ApplicationRecord
  belongs_to :post
end

homepage.rb

class Homepage < ApplicationRecord
    has_many :homepagepost
    has_many :posts,-> { order(likes_count: :desc) }, through: :homepagepost
end

首页post.rb

class Homepagepost < ApplicationRecord
    belongs_to :post
end

Rails 管理员配置 rails_admin.rb

config.model Homepage do
    label "Homepage Rows"
    edit do
      field :title_heading
      field :posts
      field :status
    end
    list do
      field :title_heading
      field :posts
      field :status
      field :created_at
      field :updated_at
    end
end

现在我想在 Post 下拉菜单中显示 post 图片 URL，ID 为 post。我如何在 rails 管理员中执行此操作？点赞Post #1370 post_test.png

架构

create_table "photos", id: :serial, force: :cascade do |t|
    t.string "asset_url"
    t.integer "post_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["post_id"], name: "index_photos_on_post_id"
end

create_table "posts", id: :serial, force: :cascade do |t|
    t.integer "user_id"
    t.text "description"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["user_id"], name: "index_posts_on_user_id"
end 

create_table "homepageposts", force: :cascade do |t|
    t.integer "homepage_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.bigint "post_id"
    t.index ["post_id"], name: "index_homepageposts_on_post_id"
end

create_table "homepages", force: :cascade do |t|
    t.string "title_heading"
    t.integer "status"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
end

Answer 1

首先在 rails 管理初始值设定项上进行配置，通常在配置块内的 config/initializers/rails_admin.rb 上进行配置，该方法将在您的模型中用于确定要为每个 object 显示的标题像这样：

RailsAdmin.config do |config|
  config.label_methods = [:rails_admin_title]
end

然后在您的 post 模型上定义该方法

class Post < ApplicationRecord
    has_many :photos, dependent: :destroy
    accepts_nested_attributes_for :photos, allow_destroy: true

    def rails_admin_title
      "<a href='#{post_image}'>Link</a>".html_safe
    end

    def post_image
      photos&.first&.asset_url
    end
end

您可能需要重新启动开发服务器才能看到此更改。

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