add subfolders

lib/template_folders.rb

@@ -3,15 +3,87 @@
 module TemplateFolders
   module_function
 
+  def filter_by_full_name(template_folders, name)
+    parent_name, name = name.split(' / ', 2).map(&:squish)
+
+    if name.present?
+      parent_folder = template_folders.where(parent_folder_id: nil).find_by(name: parent_name)
+    else
+      name = parent_name
+    end
+
+    template_folders.where(name:, parent_folder:)
+  end
+
   def search(folders, keyword)
     return folders if keyword.blank?
 
     folders.where(TemplateFolder.arel_table[:name].lower.matches("%#{keyword.downcase}%"))
   end
 
+  def filter_active_folders(template_folders, templates)
+    folder_exists =
+      templates.active.where(TemplateFolder.arel_table[:id].eq(Template.arel_table[:folder_id]))
+               .select(1).limit(1).arel.exists
+
+    subfolders_arel = TemplateFolder.arel_table.alias('subfolders')
+
+    subfolder_exists =
+      TemplateFolder.from(subfolders_arel)
+                    .where(subfolders_arel[:parent_folder_id].eq(TemplateFolder.arel_table[:id]))
+                    .where(
+                      templates.active.where(Template.arel_table[:folder_id].eq(subfolders_arel[:id])).arel.exists
+                    ).select(1).limit(1).arel.exists
+
+    template_folders.where(folder_exists).or(template_folders.where(subfolder_exists))
+  end
+
+  def sort(template_folders, current_user, order)
+    case order
+    when 'used_at'
+      subquery =
+        Template.left_joins(:submissions)
+                .group(:folder_id)
+                .where(account_id: current_user.account_id)
+                .select(
+                  :folder_id,
+                  Template.arel_table[:updated_at].maximum.as('updated_at_max'),
+                  Submission.arel_table[:created_at].maximum.as('submission_created_at_max')
+                )
+
+      template_folders = template_folders.joins(
+        Template.arel_table
+                .join(subquery.arel.as('templates'), Arel::Nodes::OuterJoin)
+                .on(TemplateFolder.arel_table[:id].eq(Template.arel_table[:folder_id]))
+                .join_sources
+      )
+
+      template_folders.order(
+        Arel::Nodes::Case.new
+                         .when(Template.arel_table[:submission_created_at_max].gt(Template.arel_table[:updated_at_max]))
+                         .then(Template.arel_table[:submission_created_at_max])
+                         .else(Template.arel_table[:updated_at_max])
+                         .desc
+      )
+    when 'name'
+      template_folders.order(name: :asc)
+    else
+      template_folders.order(id: :desc)
+    end
+  end
+
   def find_or_create_by_name(author, name)
     return author.account.default_template_folder if name.blank? || name == TemplateFolder::DEFAULT_NAME
 
-    author.account.template_folders.create_with(author:, account: author.account).find_or_create_by(name:)
+    parent_name, name = name.split(' / ', 2).map(&:squish)
+
+    if name.present?
+      parent_folder = author.account.template_folders.create_with(author:)
+                            .find_or_create_by(name: parent_name, parent_folder_id: nil)
+    else
+      name = parent_name
+    end
+
+    author.account.template_folders.create_with(author:).find_or_create_by(name:, parent_folder:)
   end
 end