add subfolders

app/models/template.rb

@@ -72,12 +72,14 @@ class Template < ApplicationRecord
   scope :active, -> { where(archived_at: nil) }
   scope :archived, -> { where.not(archived_at: nil) }
 
-  delegate :name, to: :folder, prefix: true
-
   def application_key
     external_id
   end
 
+  def folder_name
+    folder.full_name
+  end
+
   private
 
   def maybe_set_default_folder

app/models/template_folder.rb

@@ -4,36 +4,50 @@
 #
 # Table name: template_folders
 #
-#  id          :bigint           not null, primary key
-#  archived_at :datetime
-#  name        :string           not null
-#  created_at  :datetime         not null
-#  updated_at  :datetime         not null
-#  account_id  :bigint           not null
-#  author_id   :bigint           not null
+#  id               :bigint           not null, primary key
+#  archived_at      :datetime
+#  name             :string           not null
+#  created_at       :datetime         not null
+#  updated_at       :datetime         not null
+#  account_id       :bigint           not null
+#  author_id        :bigint           not null
+#  parent_folder_id :bigint
 #
 # Indexes
 #
-#  index_template_folders_on_account_id  (account_id)
-#  index_template_folders_on_author_id   (author_id)
+#  index_template_folders_on_account_id        (account_id)
+#  index_template_folders_on_author_id         (author_id)
+#  index_template_folders_on_parent_folder_id  (parent_folder_id)
 #
 # Foreign Keys
 #
 #  fk_rails_...  (account_id => accounts.id)
 #  fk_rails_...  (author_id => users.id)
+#  fk_rails_...  (parent_folder_id => template_folders.id)
 #
 class TemplateFolder < ApplicationRecord
   DEFAULT_NAME = 'Default'
 
   belongs_to :author, class_name: 'User'
   belongs_to :account
+  belongs_to :parent_folder, class_name: 'TemplateFolder', optional: true
 
   has_many :templates, dependent: :destroy, foreign_key: :folder_id, inverse_of: :folder
+  has_many :subfolders, class_name: 'TemplateFolder', foreign_key: :parent_folder_id, inverse_of: :parent_folder,
+                        dependent: :destroy
   has_many :active_templates, -> { where(archived_at: nil) },
            class_name: 'Template', dependent: :destroy, foreign_key: :folder_id, inverse_of: :folder
 
   scope :active, -> { where(archived_at: nil) }
 
+  def full_name
+    if parent_folder_id?
+      [parent_folder.name, name].join(' / ')
+    else
+      name
+    end
+  end
+
   def default?
     name == DEFAULT_NAME
   end