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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 9bc29b049f..3f6fdb6bac 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
@@ -41,7 +41,7 @@ module ActiveRecord
options[:conditions] = conditions
options[:joins] = @join_sql
- options[:readonly] ||= false
+ options[:readonly] ||= !options[:joins].nil?
if options[:order] && @reflection.options[:order]
options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"