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Fix race condition 💣

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This commit is contained in:
Jon Leighton 2012-01-13 22:57:21 +00:00
parent 8a3dcd716c
commit 2c667f69aa
1 changed files with 11 additions and 4 deletions
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15
activerecord/lib/active_record/attribute_methods.rb
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@ -1,5 +1,6 @@
require 'active_support/core_ext/enumerable'
require 'active_support/deprecation'
require 'thread'
module ActiveRecord
# = Active Record Attribute Methods
@ -35,10 +36,16 @@ module ActiveRecord
# Generates all the attribute related methods for columns in the database
# accessors, mutators and query methods.
def define_attribute_methods
return if attribute_methods_generated?
superclass.define_attribute_methods unless self == base_class
super(column_names)
@attribute_methods_generated = true
# Use a mutex; we don't want two thread simaltaneously trying to define
# attribute methods.
@attribute_methods_mutex ||= Mutex.new
@attribute_methods_mutex.synchronize do
return if attribute_methods_generated?
superclass.define_attribute_methods unless self == base_class
super(column_names)
@attribute_methods_generated = true
end
end
def attribute_methods_generated?