Migrate from ledermann/rails-settings to rails-settings-cached which allows global settings

with YAML-defined defaults. Add admin page for editing global settings. Add "site_description"
setting that would show as a paragraph on the frontpage

app/controllers/about_controller.rb

@@ -4,10 +4,10 @@ class AboutController < ApplicationController
   before_action :set_body_classes
 
   def index
+    @description = Setting.site_description
   end
 
-  def terms
-  end
+  def terms; end
 
   private
 

app/controllers/admin/settings_controller.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class Admin::SettingsController < ApplicationController
+  before_action :require_admin!
+
+  layout 'admin'
+
+  def index
+    @settings = Setting.all_as_records
+  end
+
+  def update
+    @setting = Setting.where(var: params[:id]).first_or_initialize(var: params[:id])
+
+    if @setting.value != params[:setting][:value]
+      @setting.value = params[:setting][:value]
+      @setting.save
+    end
+
+    respond_to do |format|
+      format.html { redirect_to admin_settings_path }
+      format.json { respond_with_bip(@setting) }
+    end
+  end
+end

app/controllers/settings/preferences_controller.rb

@@ -8,14 +8,18 @@ class Settings::PreferencesController < ApplicationController
   def show; end
 
   def update
-    current_user.settings(:notification_emails).follow         = user_params[:notification_emails][:follow]         == '1'
-    current_user.settings(:notification_emails).follow_request = user_params[:notification_emails][:follow_request] == '1'
-    current_user.settings(:notification_emails).reblog         = user_params[:notification_emails][:reblog]         == '1'
-    current_user.settings(:notification_emails).favourite      = user_params[:notification_emails][:favourite]      == '1'
-    current_user.settings(:notification_emails).mention        = user_params[:notification_emails][:mention]        == '1'
+    current_user.settings['notification_emails'] = {
+      follow:         user_params[:notification_emails][:follow]         == '1',
+      follow_request: user_params[:notification_emails][:follow_request] == '1',
+      reblog:         user_params[:notification_emails][:reblog]         == '1',
+      favourite:      user_params[:notification_emails][:favourite]      == '1',
+      mention:        user_params[:notification_emails][:mention]        == '1',
+    }
 
-    current_user.settings(:interactions).must_be_follower  = user_params[:interactions][:must_be_follower]  == '1'
-    current_user.settings(:interactions).must_be_following = user_params[:interactions][:must_be_following] == '1'
+    current_user.settings['interactions'] = {
+      must_be_follower:  user_params[:interactions][:must_be_follower]  == '1',
+      must_be_following: user_params[:interactions][:must_be_following] == '1',
+    }
 
     if current_user.update(user_params.except(:notification_emails, :interactions))
       redirect_to settings_preferences_path, notice: I18n.t('generic.changes_saved_msg')