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-rw-r--r--activerecord/lib/active_record/attribute_methods.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index 6c2403d87e..b9141b9b33 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -66,6 +66,7 @@ module ActiveRecord
# Generates all the attribute related methods for columns in the database
# accessors, mutators and query methods.
def define_attribute_methods # :nodoc:
+ return false if @attribute_methods_generated
# Use a mutex; we don't want two thread simultaneously trying to define
# attribute methods.
generated_attribute_methods.synchronize do