one way to avoid autosave

app/models/locomotive/extensions/page/fullpath.rb

@@ -16,6 +16,7 @@ module Locomotive
           before_validation :get_wildcards_from_parent
           before_validation :add_slug_to_wildcards
           before_save       :build_fullpath
+          before_save       :set_children_autosave
           # before_rearrange  :foo #propagate_fullpath_changes
           # after_save        :propagate_fullpath_changes
 
@@ -61,6 +62,11 @@ module Locomotive
 
         protected
 
+        def set_children_autosave
+          @autosave_for_children = !must_propagate_fullpath_changes?
+          true
+        end
+
         def get_wildcards_from_parent
           return true if self.parent.nil?
 
@@ -88,8 +94,12 @@ module Locomotive
           end
         end
 
+        def must_propagate_fullpath_changes?
+          self.wildcard_changed? || self.slug_changed?
+        end
+
         def propagate_fullpath_changes
-          return true unless self.wildcard_changed? || self.slug_changed?
+          return true unless must_propagate_fullpath_changes?
 
           parent_identities = { self._id => self }
 

app/models/locomotive/extensions/page/tree.rb

@@ -74,6 +74,10 @@ module Locomotive
 
         end
 
+        def autosave_for_children?
+          @autosave_for_children != false
+        end
+
         # Returns the children of this node but with the minimal set of required attributes
         #
         # @return [ Array ] The children pages ordered by their position

lib/locomotive/mongoid/patches.rb

@@ -12,6 +12,28 @@ module Mongoid#:nodoc:
     end
   end
 
+  module Relations #:nodoc:
+    module AutoSave
+      module ClassMethods #:nodoc:
+        def autosave(metadata)
+          if metadata.autosave?
+            set_callback :save, :after do |document|
+              relation = document.send(metadata.name)
+
+              return true if document.try(:"autosave_for_#{metadata.name}?") == false # FIXME (Didier L.) add more control on the document side
+
+              if relation
+                (relation.do_or_do_not(:in_memory) || Array.wrap(relation)).each do |doc|
+                  doc.save
+                end
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
   module Fields #:nodoc:
     module Internal #:nodoc:
       class RawArray < Mongoid::Fields::Internal::Array
@@ -59,3 +81,5 @@ module Mongoid#:nodoc:
   end
 
 end
+
+