add folders migration

app/models/account.rb

@@ -16,6 +16,9 @@ class Account < ApplicationRecord
   has_many :encrypted_configs, dependent: :destroy
   has_many :account_configs, dependent: :destroy
   has_many :templates, dependent: :destroy
+  has_many :template_folders, dependent: :destroy
+  has_one :default_folder, -> { where(name: TemplateFolder::DEFAULT_NAME) },
+          class_name: 'TemplateFolder', dependent: :destroy, inverse_of: :account
   has_many :submissions, through: :templates
   has_many :submitters, through: :submissions
   has_many :active_users, -> { active }, dependent: :destroy,
@@ -23,4 +26,10 @@ class Account < ApplicationRecord
 
   attribute :timezone, :string, default: 'UTC'
   attribute :locale, :string, default: 'en-US'
+
+  def default_folder
+    super || template_folders.new(name: TemplateFolder::DEFAULT_NAME,
+                                  author_id: users.minimum(:id))
+                             .tap(&:save!)
+  end
 end

app/models/template.rb

@@ -16,23 +16,29 @@
 #  updated_at :datetime         not null
 #  account_id :bigint           not null
 #  author_id  :bigint           not null
+#  folder_id  :bigint           not null
 #
 # Indexes
 #
 #  index_templates_on_account_id  (account_id)
 #  index_templates_on_author_id   (author_id)
+#  index_templates_on_folder_id   (folder_id)
 #  index_templates_on_slug        (slug) UNIQUE
 #
 # Foreign Keys
 #
 #  fk_rails_...  (account_id => accounts.id)
 #  fk_rails_...  (author_id => users.id)
+#  fk_rails_...  (folder_id => template_folders.id)
 #
 class Template < ApplicationRecord
   DEFAULT_SUBMITTER_NAME = 'First Submitter'
 
   belongs_to :author, class_name: 'User'
   belongs_to :account
+  belongs_to :folder, class_name: 'TemplateFolder'
+
+  before_validation :maybe_set_default_folder, on: :create
 
   attribute :fields, :string, default: -> { [] }
   attribute :schema, :string, default: -> { [] }
@@ -52,4 +58,10 @@ class Template < ApplicationRecord
   has_many :submissions, dependent: :destroy
 
   scope :active, -> { where(deleted_at: nil) }
+
+  private
+
+  def maybe_set_default_folder
+    self.folder ||= account.default_folder
+  end
 end

app/models/template_folder.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: template_folders
+#
+#  id         :bigint           not null, primary key
+#  deleted_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
+#
+# Indexes
+#
+#  index_template_folders_on_account_id  (account_id)
+#  index_template_folders_on_author_id   (author_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (account_id => accounts.id)
+#  fk_rails_...  (author_id => users.id)
+#
+class TemplateFolder < ApplicationRecord
+  DEFAULT_NAME = 'Default'
+
+  belongs_to :author, class_name: 'User'
+  belongs_to :account
+
+  has_many :templates, dependent: :destroy
+
+  scope :active, -> { where(deleted_at: nil) }
+end