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-rw-r--r--activerecord/lib/active_record/relation/delegation.rb24
1 files changed, 21 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/relation/delegation.rb b/activerecord/lib/active_record/relation/delegation.rb
index ab8b36c8ab..dbfa92bbbd 100644
--- a/activerecord/lib/active_record/relation/delegation.rb
+++ b/activerecord/lib/active_record/relation/delegation.rb
@@ -1,3 +1,4 @@
+require 'thread'
module ActiveRecord
module Delegation # :nodoc:
@@ -6,6 +7,8 @@ module ActiveRecord
delegate :table_name, :quoted_table_name, :primary_key, :quoted_primary_key,
:connection, :columns_hash, :auto_explain_threshold_in_seconds, :to => :klass
+ @@delegation_mutex = Mutex.new
+
def self.delegate_to_scoped_klass(method)
if method.to_s =~ /\A[a-zA-Z_]\w*[!?]?\z/
module_eval <<-RUBY, __FILE__, __LINE__ + 1
@@ -32,13 +35,28 @@ module ActiveRecord
def method_missing(method, *args, &block)
if @klass.respond_to?(method)
- ::ActiveRecord::Delegation.delegate_to_scoped_klass(method)
+ @@delegation_mutex.synchronize do
+ unless ::ActiveRecord::Delegation.method_defined?(method)
+ ::ActiveRecord::Delegation.delegate_to_scoped_klass(method)
+ end
+ end
+
scoping { @klass.send(method, *args, &block) }
elsif Array.method_defined?(method)
- ::ActiveRecord::Delegation.delegate method, :to => :to_a
+ @@delegation_mutex.synchronize do
+ unless ::ActiveRecord::Delegation.method_defined?(method)
+ ::ActiveRecord::Delegation.delegate method, :to => :to_a
+ end
+ end
+
to_a.send(method, *args, &block)
elsif arel.respond_to?(method)
- ::ActiveRecord::Delegation.delegate method, :to => :arel
+ @@delegation_mutex.synchronize do
+ unless ::ActiveRecord::Delegation.method_defined?(method)
+ ::ActiveRecord::Delegation.delegate method, :to => :arel
+ end
+ end
+
arel.send(method, *args, &block)
else
super