nested has one field

app/views/madmin/fields/nested_has_one/_form.html.erb

@@ -0,0 +1,36 @@
+<div class="block md:inline-block md:w-32 flex-shrink-0 text-gray-700">
+  <%= render "madmin/shared/label", form: form, field: field %>
+</div>
+<%= content_tag :div, class: "border border-gray-200 rounded-lg p-5" do %>
+  <%= form.fields_for(
+    field.attribute_name,
+    form.object.public_send(field.attribute_name) || field.to_model.new,
+    {}
+  ) do |nested_form| %>
+    <% field.nested_attributes.each do |name, nested_attribute| %>
+      <% next if nested_attribute[:field].nil? %>
+      <% next unless nested_attribute[:field].visible?(action_name) %>
+      <% next unless nested_attribute[:field].visible?(:form) %>
+
+      <% nested_field = nested_attribute[:field] %>
+
+      <div class="mb-4 flex">
+        <%= render(
+          partial: nested_field.to_partial_path("form"),
+          locals: {
+            field: nested_field,
+            record: nested_form.object,
+            form: nested_form,
+            resource: field.resource
+          }
+        )%>
+      </div>
+    <% end %>
+    <div class="mb-4 flex">
+      <div class="block md:inline-block md:w-32 flex-shrink-0 text-red-500">
+        <%= nested_form.label :_destroy %>
+      </div>
+      <%= nested_form.check_box :_destroy, class: "form-checkbox text-red-600 checked:ring-red-600 focus:ring-red-600" %>
+    </div>
+  <% end %>
+<% end %>

app/views/madmin/fields/nested_has_one/_index.html.erb

@@ -0,0 +1,3 @@
+<% if (object = field.value(record)) %>
+  <%= link_to Madmin.resource_for(object).display_name(object), Madmin.resource_for(object).show_path(object) %>
+<% end %>

app/views/madmin/fields/nested_has_one/_show.html.erb

@@ -0,0 +1,3 @@
+<% if (object = field.value(record)) %>
+  <%= link_to Madmin.resource_for(object).display_name(object), Madmin.resource_for(object).show_path(object) %>
+<% end %>

lib/madmin.rb

@@ -25,6 +25,7 @@ module Fields
     autoload :Integer, "madmin/fields/integer"
     autoload :Json, "madmin/fields/json"
     autoload :NestedHasMany, "madmin/fields/nested_has_many"
+    autoload :NestedHasOne, "madmin/fields/nested_has_one"
     autoload :Password, "madmin/fields/password"
     autoload :Polymorphic, "madmin/fields/polymorphic"
     autoload :RichText, "madmin/fields/rich_text"

lib/madmin/fields/nested_has_one.rb

@@ -0,0 +1,32 @@
+module Madmin
+  module Fields
+    class NestedHasOne < Field
+      DEFAULT_ATTRIBUTES = %w[_destroy id].freeze
+      def nested_attributes
+        resource.attributes.except(*skipped_fields)
+      end
+
+      def resource
+        "#{to_model.name}Resource".constantize
+      end
+
+      def to_param
+        {"#{attribute_name}_attributes": permitted_fields}
+      end
+
+      def to_model
+        attribute_name.to_s.singularize.classify.constantize
+      end
+
+      private
+
+      def permitted_fields
+        (resource.permitted_params - skipped_fields + DEFAULT_ATTRIBUTES).uniq
+      end
+
+      def skipped_fields
+        options[:skip] || []
+      end
+    end
+  end
+end

lib/madmin/resource.rb

@@ -175,7 +175,8 @@ def field_for_type(type)
           has_many: Fields::HasMany,
           has_one: Fields::HasOne,
           rich_text: Fields::RichText,
-          nested_has_many: Fields::NestedHasMany
+          nested_has_many: Fields::NestedHasMany,
+          nested_has_one: Fields::NestedHasOne
         }.fetch(type)
       end
 

test/dummy/app/controllers/madmin/post_stats_controller.rb

@@ -0,0 +1,4 @@
+module Madmin
+  class PostStatsController < Madmin::ResourceController
+  end
+end

test/dummy/app/madmin/resources/post_resource.rb

@@ -17,6 +17,7 @@ class PostResource < Madmin::Resource
   attribute :versions, form: false
   attribute :user
   attribute :comments
+  attribute :post_stat, :nested_has_one, skip: %I[shared]
 
   # Scopes
   scope :recent

test/dummy/app/madmin/resources/post_stat_resource.rb

@@ -0,0 +1,26 @@
+class PostStatResource < Madmin::Resource
+  # Attributes
+  attribute :id, form: false
+  attribute :drafts_saved
+  attribute :keywords
+  attribute :shared
+  attribute :created_at, form: false
+  attribute :updated_at, form: false
+
+  # Associations
+  attribute :post
+
+  # Uncomment this to customize the display name of records in the admin area.
+  # def self.display_name(record)
+  #   record.name
+  # end
+
+  # Uncomment this to customize the default sort column and direction.
+  # def self.default_sort_column
+  #   "created_at"
+  # end
+  #
+  # def self.default_sort_direction
+  #   "desc"
+  # end
+end

test/dummy/app/models/post.rb

@@ -4,6 +4,8 @@ class Post < ApplicationRecord
   has_paper_trail
 
   belongs_to :user
+  has_one :post_stat
+  accepts_nested_attributes_for :post_stat, allow_destroy: true
   has_many :comments, as: :commentable, dependent: :destroy
   has_many_attached :attachments
   has_one_attached :image

test/dummy/app/models/post_stat.rb

@@ -0,0 +1,3 @@
+class PostStat < ApplicationRecord
+  belongs_to :post
+end

test/dummy/config/routes/madmin.rb

@@ -17,6 +17,7 @@
       patch :archive
     end
   end
+  resources :post_stats
   namespace :action_text do
     resources :rich_texts
   end

test/dummy/db/migrate/20240515044320_create_post_stats.rb

@@ -0,0 +1,12 @@
+class CreatePostStats < ActiveRecord::Migration[7.1]
+  def change
+    create_table :post_stats do |t|
+      t.references :post, foreign_key: true
+      t.integer :drafts_saved
+      t.string :keywords
+      t.boolean :shared, default: false
+
+      t.timestamps
+    end
+  end
+end

test/dummy/db/schema.rb

@@ -10,14 +10,13 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_09_21_230902) do
-
+ActiveRecord::Schema[7.1].define(version: 2024_05_15_044320) do
   create_table "action_mailbox_inbound_emails", force: :cascade do |t|
     t.bigint "status", default: 0, null: false
     t.string "message_id", null: false
     t.string "message_checksum", null: false
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.index ["message_id", "message_checksum"], name: "index_action_mailbox_inbound_emails_uniqueness", unique: true
   end
 
@@ -26,8 +25,8 @@
     t.text "body"
     t.string "record_type", null: false
     t.bigint "record_id", null: false
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.index ["record_type", "record_id", "name"], name: "index_action_text_rich_texts_uniqueness", unique: true
   end
 
@@ -64,8 +63,8 @@
     t.string "commentable_type", null: false
     t.bigint "commentable_id", null: false
     t.text "body"
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.index ["commentable_type", "commentable_id"], name: "index_comments_on_commentable_type_and_commentable_id"
     t.index ["user_id"], name: "index_comments_on_user_id"
   end
@@ -77,8 +76,18 @@
   create_table "numericals", force: :cascade do |t|
     t.decimal "decimal"
     t.float "float"
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  create_table "post_stats", force: :cascade do |t|
+    t.integer "post_id"
+    t.integer "drafts_saved"
+    t.string "keywords"
+    t.boolean "shared", default: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["post_id"], name: "index_post_stats_on_post_id"
   end
 
   create_table "posts", force: :cascade do |t|
@@ -87,16 +96,16 @@
     t.integer "comments_count"
     t.integer "state"
     t.json "metadata"
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    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 "user_connected_accounts", force: :cascade do |t|
     t.bigint "user_id", null: false
     t.string "service"
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.index ["user_id"], name: "index_user_connected_accounts_on_user_id"
   end
 
@@ -114,8 +123,8 @@
     t.string "password_digest"
     t.string "token"
     t.string "ssn"
-    t.datetime "created_at", precision: 6, null: false
-    t.datetime "updated_at", precision: 6, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.json "settings"
     t.text "preferences"
   end
@@ -134,5 +143,6 @@
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "comments", "users"
+  add_foreign_key "post_stats", "posts"
   add_foreign_key "user_connected_accounts", "users"
 end

test/dummy/test/models/post_stat_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class PostStatTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end