Remove Site ID from nodes

Nodes can get their Site through their language.

app/controllers/alchemy/admin/nodes_controller.rb

@@ -11,7 +11,6 @@ def index
 
       def new
         @node = Node.new(
-          site: Alchemy::Site.current,
           parent_id: params[:parent_id],
           language: @current_language,
         )
@@ -21,7 +20,6 @@ def new
 
       def resource_params
         params.require(:node).permit(
-          :site_id,
           :parent_id,
           :language_id,
           :page_id,

app/models/alchemy/node.rb

@@ -7,10 +7,11 @@ class Node < BaseRecord
     acts_as_nested_set scope: "language_id", touch: true
     stampable stamper_class_name: Alchemy.user_class_name
 
-    belongs_to :site, class_name: "Alchemy::Site"
     belongs_to :language, class_name: "Alchemy::Language"
     belongs_to :page, class_name: "Alchemy::Page", optional: true, inverse_of: :nodes
 
+    has_one :site, through: :language
+
     has_many :essence_nodes, class_name: "Alchemy::Node", inverse_of: :node
 
     validates :name, presence: true, if: -> { page.nil? }

app/models/alchemy/page.rb

@@ -597,10 +597,8 @@ def set_published_at
     end
 
     def attach_to_menu!
-      current_site_id = Alchemy::Site.current.id
-      node = Alchemy::Node.find_by!(id: menu_id, site_id: current_site_id)
+      node = Alchemy::Node.find_by!(id: menu_id, language_id: language_id)
       node.children.create!(
-        site_id: current_site_id,
         language_id: language_id,
         page_id: id,
         name: name,

app/views/alchemy/admin/nodes/_form.html.erb

@@ -17,7 +17,6 @@
     <%= f.input :external %>
     <%= f.hidden_field :parent_id %>
   <% end %>
-  <%= f.hidden_field :site_id %>
   <%= f.hidden_field :language_id %>
   <%= f.submit button_label %>
 <% end %>

db/migrate/20200504210159_remove_site_id_from_nodes.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+class RemoveSiteIdFromNodes < ActiveRecord::Migration[5.2]
+  def up
+    remove_foreign_key :alchemy_nodes, :alchemy_sites
+    remove_index :alchemy_nodes, :site_id
+    remove_column :alchemy_nodes, :site_id, :integer, null: false
+  end
+
+  def down
+    # This IS, in fact, reversible - but it's cumbersome to do. If someone tells me it benefits them
+    # I will implement.
+    raise ActiveRecord::IrreversibleMigration
+  end
+end

lib/alchemy/test_support/factories/node_factory.rb

@@ -6,7 +6,6 @@
 
 FactoryBot.define do
   factory :alchemy_node, class: "Alchemy::Node" do
-    site { Alchemy::Site.default || create(:alchemy_site) }
     language { Alchemy::Language.default || create(:alchemy_language) }
     name { "A Node" }
 

spec/controllers/alchemy/admin/nodes_controller_spec.rb

@@ -61,7 +61,7 @@ module Alchemy
 
         it "creates node and redirects to index" do
           expect {
-            post :create, params: { node: { name: "Node", language_id: language.id, site_id: language.site_id } }
+            post :create, params: { node: { name: "Node", language_id: language.id } }
           }.to change { Alchemy::Node.count }.by(1)
           expect(response).to redirect_to(admin_nodes_path)
         end

spec/dummy/db/migrate/20200504210159_remove_site_id_from_nodes.rb

@@ -0,0 +1 @@
+../../../../db/migrate/20200504210159_remove_site_id_from_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_04_23_073425) do
+ActiveRecord::Schema.define(version: 2020_05_04_210159) do
 
   create_table "alchemy_attachments", force: :cascade do |t|
     t.string "name"
@@ -228,14 +228,12 @@
     t.integer "updater_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.integer "site_id", null: false
     t.index ["creator_id"], name: "index_alchemy_nodes_on_creator_id"
     t.index ["language_id"], name: "index_alchemy_nodes_on_language_id"
     t.index ["lft"], name: "index_alchemy_nodes_on_lft"
     t.index ["page_id"], name: "index_alchemy_nodes_on_page_id"
     t.index ["parent_id"], name: "index_alchemy_nodes_on_parent_id"
     t.index ["rgt"], name: "index_alchemy_nodes_on_rgt"
-    t.index ["site_id"], name: "index_alchemy_nodes_on_site_id"
     t.index ["updater_id"], name: "index_alchemy_nodes_on_updater_id"
   end
 
@@ -371,5 +369,4 @@
   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
-  add_foreign_key "alchemy_nodes", "alchemy_sites", column: "site_id", on_delete: :cascade
 end

spec/helpers/alchemy/pages_helper_spec.rb

@@ -67,10 +67,10 @@ module Alchemy
 
       context "with multiple sites" do
         let!(:site_2) { create(:alchemy_site, host: "another-site.com") }
-        let!(:menu) { create(:alchemy_node, name: name, site: Alchemy::Site.current) }
+        let!(:menu) { create(:alchemy_node, name: name, language: Alchemy::Language.current) }
         let!(:node) { create(:alchemy_node, parent: menu, url: "/default-site") }
-        let!(:menu_2) { create(:alchemy_node, name: name, site: site_2) }
-        let!(:node_2) { create(:alchemy_node, parent: menu_2, site: site_2, url: "/site-2") }
+        let!(:menu_2) { create(:alchemy_node, name: name, language: klingon) }
+        let!(:node_2) { create(:alchemy_node, parent: menu_2, language: klingon, url: "/site-2") }
 
         it "renders menu from current site" do
           is_expected.to have_selector('ul.nav > li.nav-item > a.nav-link[href="/default-site"]')