Fix group_orders document preloading

app/models/concerns/find_each_with_order.rb

@@ -0,0 +1,39 @@
+# @see https://gist.github.com/virtualstaticvoid/8705533
+module FindEachWithOrder
+  extend ActiveSupport::Concern
+
+  class_methods do
+
+    def find_each_with_order(options = {})
+      find_in_batches_with_order(options) do |records|
+        records.each { |record| yield record }
+      end
+    end
+
+    # NOTE: any limit() on the query is overridden with the batch size
+    def find_in_batches_with_order(options = {})
+      options.assert_valid_keys(:batch_size)
+
+      relation = self
+
+      start = 0
+      batch_size = options.delete(:batch_size) || 1000
+
+      relation = relation.limit(batch_size)
+      records = relation.offset(start).to_a
+
+      while records.any?
+        records_size = records.size
+
+        yield records
+
+        break if records_size < batch_size
+
+        # get the next batch
+        start += batch_size
+        records = relation.offset(start).to_a
+      end
+    end
+
+  end
+end