Fix active ordergroup

app/controllers/foodcoop/ordergroups_controller.rb

@@ -7,7 +7,7 @@ class Foodcoop::OrdergroupsController < ApplicationController
     end
 
     if params[:only_active] # Select only active groups
-      @ordergroups = @ordergroups.joins(:orders).where("orders.starts >= ?", Time.now.months_ago(3)).uniq
+      @ordergroups = @ordergroups.active
     end
 
     @ordergroups = @ordergroups.page(params[:page]).per(@per_page)

app/models/ordergroup.rb

@@ -20,6 +20,8 @@ class Ordergroup < Group
 
   after_create :update_stats!
 
+  scope :active, -> { joins(:orders).where(orders: { starts: (Time.now.months_ago(3)..) }).group(:id) }
+
   def contact
     "#{contact_phone} (#{contact_person})"
   end