Commits on Jul 18, 2013

1. When running the alchemy scaffold on MySQL an error is generated on t… …

   …able
   
   creation:
   
   sqlalchemy.exc.OperationalError: (OperationalError) (1170, "BLOB/TEXT column 'name' used in key specification without a key length") '\nCREATE TABLE models (\n\tid INTEGER NOT NULL AUTO_INCREMENT, \n\tname TEXT, \n\tvalue INTEGER, \n\tPRIMARY KEY (id), \n\tUNIQUE (name)\n)\n\n' ()
   
   MySQL (and MariaDB) doesn't allow an index of more than 255 characters. After
   modifying the scaffold and creating a project, the following results:
   
   > show create table models;
   +--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | Table  | Create Table                                                                                                                                                                                                                       |
   +--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | models | CREATE TABLE `models` (
     `id` int(11) NOT NULL AUTO_INCREMENT,
     `name` text,
     `value` int(11) DEFAULT NULL,
     PRIMARY KEY (`id`),
     UNIQUE KEY `my_index` (`name`(255))
   ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 |
   +--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   
   A unique index is created on the name field, constrained to 255 characters.
   
   When run on SQLite3:
   
   sqlite> .schema models
   CREATE TABLE models (
   	id INTEGER NOT NULL,
   	name TEXT,
   	value INTEGER,
   	PRIMARY KEY (id)
   );
   CREATE UNIQUE INDEX my_index ON models (name);
   
   the mysql specific constraint is ignored and the table is created with a unique
   index as desired.

   Chris Davies committed Jul 18, 2013
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