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-rw-r--r--activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
index 357b28ac94..092b4ebd2f 100644
--- a/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
+++ b/activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb
@@ -110,7 +110,7 @@ module ActiveRecord::Associations::Builder
rhs_options = {}
if options.key? :class_name
- rhs_options[:foreign_key] = options[:class_name].foreign_key
+ rhs_options[:foreign_key] = options[:class_name].to_s.foreign_key
rhs_options[:class_name] = options[:class_name]
end