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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index d0ea468430..a848838a4e 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -516,7 +516,7 @@ module ActiveRecord
def pk_and_sequence_for(table)
execute_and_free("SHOW CREATE TABLE #{quote_table_name(table)}", 'SCHEMA') do |result|
create_table = each_hash(result).first[:"Create Table"]
- if create_table.to_s =~ /PRIMARY KEY\s+\((.+)\)/
+ if create_table.to_s =~ /PRIMARY KEY\s+(?:USING\s+\w+\s+)?\((.+)\)/
keys = $1.split(",").map { |key| key.delete('`"') }
keys.length == 1 ? [keys.first, nil] : nil
else