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-rw-r--r--activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
index c4eead0e56..d08e47378f 100644
--- a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
@@ -4,7 +4,7 @@ module ActiveRecord
def initialize(owner, association_name, association_class_name, association_class_primary_key_name, options)
super
- @association_foreign_key = options[:association_foreign_key] || Inflector.underscore(Inflector.demodulize(association_class_name)) + "_id"
+ @association_foreign_key = options[:association_foreign_key] || association_class_name.foreign_key
@association_table_name = options[:table_name] || @association_class.table_name
@join_table = options[:join_table]
@order = options[:order]