Add int_array type for PostgreSQL.

[rootpd]

Abstract class was created for PostgreSQL arrays and all subclasses (int_array, text_array) are meant to be its extension.

Tests and Readme.md were updated. Tests now check also for type of returned array - array of integers for int_array, array of strings for text_array.

[richardfullmer]

Nice work @rootpd

[rootpd]

I've found an issue after all, maybe you'll be able help me with it (maybe it's not an issue). PostgreSQL returns integer array column defined as _int4 which is not recognized by default by doctrine.

Correct approach seems to be calling this in main class of bundle using this type:

class BayloftIdentityBundle extends Bundle
{
    public function boot()
    {
        $em = $this->container->get('doctrine.orm.entity_manager');
        $em->getConnection()->getDatabasePlatform()->registerDoctrineTypeMapping('_int4','int_array');
    }
}

Without this, schema update will work first time but on each update when column is already present, user will get following command exception:

[Doctrine\DBAL\DBALException]                                                                          
Unknown database type _int4 requested, Doctrine\DBAL\Platforms\PostgreSqlPlatform may not support it.

Can you figure out the way how to make this seamless?

[richardfullmer]

Maybe we should just use _int4 as our name for the type. Does that work?

[rootpd]

It worked, didn't see the forest for the trees. Tried to figure out how to register the extra type when this is just really enough. Thanks :).