Fix clearing of inverse fks on in memory duplicate set. [ fix mongodb…

…#2310 ]
mongoid · Aug 25, 2012 · 289aa18 · 289aa18
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -10,6 +10,9 @@ For instructions on upgrading to newer versions, visit
 * \#2311 `Document#changes` no longer returns `nil` values for Array and Hash
   fields that were only accessed and didn't actually change. Regression from 2.4.x.
 
+* \#2310 Setting a many to many duplicate successively in memory no longer clears
+  the inverse foreign keys.
+
 * \#2309 Allow embeds_one relations to be set with hashes more than just the
   initial set.
 

diff --git a/lib/mongoid/relations/referenced/many_to_many.rb b/lib/mongoid/relations/referenced/many_to_many.rb
@@ -146,6 +146,9 @@ def nullify
           end
           target.clear do |doc|
             unbind_one(doc)
+            unless metadata.forced_nil_inverse?
+              doc.changed_attributes.delete(inverse_foreign_key)
+            end
           end
         end
         alias :nullify_all :nullify