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-rw-r--r--activerecord/lib/active_record/associations/association_collection.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/associations/association_collection.rb b/activerecord/lib/active_record/associations/association_collection.rb
index 8de528f638..afb817f8ae 100644
--- a/activerecord/lib/active_record/associations/association_collection.rb
+++ b/activerecord/lib/active_record/associations/association_collection.rb
@@ -238,6 +238,8 @@ module ActiveRecord
def size
if @owner.new_record? || (loaded? && !@reflection.options[:uniq])
@target.size
+ elsif !loaded? && @reflection.options[:group]
+ load_target.size
elsif !loaded? && !@reflection.options[:uniq] && @target.is_a?(Array)
unsaved_records = @target.select { |r| r.new_record? }
unsaved_records.size + count_records