1 files changed, 15 insertions, 6 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 00e3d2965b..af156c9c78 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -307,7 +307,7 @@ module ActiveRecord
       #
       # http://bugs.mysql.com/bug.php?id=39170
       def supports_transaction_isolation?
-        version[0] >= 5
+        version >= '5.0.0'
       end
 
       def supports_indexes_in_create?
@@ -319,11 +319,11 @@ module ActiveRecord
       end
 
       def supports_views?
-        version[0] >= 5
+        version >= '5.0.0'
       end
 
       def supports_datetime_with_precision?
-        (version[0] == 5 && version[1] >= 6) || version[0] >= 6
+        version >= '5.6.4'
       end
 
       def native_database_types
@@ -386,6 +386,14 @@ module ActiveRecord
         0
       end
 
+      def quoted_date(value)
+        if supports_datetime_with_precision?
+          super
+        else
+          super.sub(/\.\d{6}\z/, '')
+        end
+      end
+
       # REFERENTIAL INTEGRITY ====================================
 
       def disable_referential_integrity #:nodoc:
@@ -629,7 +637,8 @@ module ActiveRecord
         end
       end
 
-      def change_column_default(table_name, column_name, default) #:nodoc:
+      def change_column_default(table_name, column_name, default_or_changes) #:nodoc:
+        default = extract_new_default_value(default_or_changes)
         column = column_for(table_name, column_name)
         change_column table_name, column_name, column.sql_type, :default => default
       end
@@ -937,7 +946,7 @@ module ActiveRecord
       end
 
       def version
-        @version ||= full_version.scan(/^(\d+)\.(\d+)\.(\d+)/).flatten.map(&:to_i)
+        @version ||= Version.new(full_version.match(/^\d+\.\d+\.\d+/)[0])
       end
 
       def mariadb?
@@ -945,7 +954,7 @@ module ActiveRecord
       end
 
       def supports_rename_index?
-        mariadb? ? false : (version[0] == 5 && version[1] >= 7) || version[0] >= 6
+        mariadb? ? false : version >= '5.7.6'
       end
 
       def configure_connection