1 files changed, 6 insertions, 5 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index dd54950790..c5962764f5 100755
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -473,11 +473,12 @@ module ActiveRecord
         return super unless type.to_s == 'integer'
 
         case limit
-        when 1;       'tinyint'
-        when 2;       'smallint'
-        when 3;       'mediumint'
-        when 4, nil;  'int(11)'
-        else;         'bigint'
+        when 1; 'tinyint'
+        when 2; 'smallint'
+        when 3; 'mediumint'
+        when nil, 4, 11; 'int(11)'  # compatibility with MySQL default
+        when 5..8; 'bigint'
+        else raise(ActiveRecordError, "No integer type has byte size #{limit}")
         end
       end