Add EssenceNode (AlchemyCMS#1792)

This Essence can be used to add a menu and its children to an Element.

app/models/alchemy/essence_node.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+module Alchemy
+  class EssenceNode < BaseRecord
+    NODE_ID = /\A\d+\z/
+
+    acts_as_essence(
+      ingredient_column: :node,
+      preview_text_column: :node_name,
+      belongs_to: {
+        class_name: "Alchemy::Node",
+        foreign_key: :node_id,
+        inverse_of: :essence_nodes,
+        optional: true
+      }
+    )
+
+    delegate :name, to: :node, prefix: true
+
+    def ingredient=(node)
+      case node
+      when NODE_ID
+        self.node = Alchemy::Page.new(id: node)
+      when Alchemy::Node
+        self.node = node
+      else
+        super
+      end
+    end
+  end
+end

app/models/alchemy/node.rb

@@ -11,6 +11,8 @@ class Node < BaseRecord
     belongs_to :language, class_name: 'Alchemy::Language'
     belongs_to :page, class_name: 'Alchemy::Page', optional: true, inverse_of: :nodes
 
+    has_many :essence_nodes, class_name: "Alchemy::Node", inverse_of: :node
+
     validates :name, presence: true, if: -> { page.nil? }
     validates :url, format: { with: VALID_URL_REGEX }, unless: -> { url.nil? }
 

app/views/alchemy/essences/_essence_node_editor.html.erb

@@ -0,0 +1,21 @@
+<%#
+  Available locals:
+  * content (The object the essence is linked to the element)
+  * html_options
+
+  Please consult Alchemy::Content.rb docs for further methods on the content object
+%>
+<div class="content_editor essence_node" id="<%= content.dom_id %>" data-content-id="<%= content.id %>">
+  <%= content_label(content) %>
+   <%= select_tag(
+    content.form_field_name,
+    options_from_collection_for_select(
+      local_assigns.fetch(:options, {})[:nodes] || Alchemy::Node.where(site: Alchemy::Site.current),
+      :id,
+      :name,
+      content.essence.node_id
+    ),
+    include_blank: t(".none"),
+    class: "alchemy_selectbox essence_editor_select full_width"
+  ) %>
+</div>

app/views/alchemy/essences/_essence_node_view.html.erb

@@ -0,0 +1,2 @@
+<%# The content object holds the essence %>
+<%= content.ingredient %>

db/migrate/20200423073425_create_alchemy_essence_nodes.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class CreateAlchemyEssenceNodes < ActiveRecord::Migration[5.2]
+  def change
+    create_table :alchemy_essence_nodes do |t|
+      t.integer "node_id"
+      t.index ["node_id"], name: "index_alchemy_essence_nodes_on_node_id"
+      t.timestamps
+    end
+    add_foreign_key "alchemy_essence_nodes", "alchemy_nodes", column: "node_id"
+  end
+end

spec/dummy/db/migrate/20200423073425_create_alchemy_essence_nodes.rb

@@ -0,0 +1 @@
+../../../../db/migrate/20200423073425_create_alchemy_essence_nodes.rb

spec/dummy/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_02_26_213334) do
+ActiveRecord::Schema.define(version: 2020_04_23_073425) do
 
   create_table "alchemy_attachments", force: :cascade do |t|
     t.string "name"
@@ -110,6 +110,13 @@
     t.integer "updater_id"
   end
 
+  create_table "alchemy_essence_nodes", force: :cascade do |t|
+    t.integer "node_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["node_id"], name: "index_alchemy_essence_nodes_on_node_id"
+  end
+
   create_table "alchemy_essence_pages", force: :cascade do |t|
     t.integer "page_id"
     t.datetime "created_at", null: false
@@ -360,6 +367,7 @@
 
   add_foreign_key "alchemy_contents", "alchemy_elements", column: "element_id", on_update: :cascade, on_delete: :cascade
   add_foreign_key "alchemy_elements", "alchemy_pages", column: "page_id", on_update: :cascade, on_delete: :cascade
+  add_foreign_key "alchemy_essence_nodes", "alchemy_nodes", column: "node_id"
   add_foreign_key "alchemy_essence_pages", "alchemy_pages", column: "page_id"
   add_foreign_key "alchemy_nodes", "alchemy_languages", column: "language_id"
   add_foreign_key "alchemy_nodes", "alchemy_pages", column: "page_id", on_delete: :cascade

spec/models/alchemy/essence_node_spec.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Alchemy::EssenceNode, type: :model do
+  it { is_expected.to belong_to(:ingredient_association).optional.class_name('Alchemy::Node') }
+
+  describe '#ingredient' do
+    let(:node) { build(:alchemy_node) }
+
+    subject { described_class.new(node: node).ingredient }
+
+    it { is_expected.to eq(node) }
+  end
+
+  describe '#preview_text' do
+    let(:node) { build(:alchemy_node) }
+
+    subject { described_class.new(node: node).preview_text }
+
+    it { is_expected.to eq(node.name) }
+  end
+end