Patch attached to fix this issue

What steps will reproduce the problem? 1. Create a database table with a db-specific primary key, for example "mediumint" in MySQL. 2. Call DB.dump_schema_migration(:same_db => true)

What is the expected output? What do you see instead?

The migration should include a column definition:

primary_key :id, :type => "mediumint"

Instead the output is:

primary_key :id, :type => String

This patch looks good. I've got a few other patches waiting in my local repository, but as soon as I've finished with those, I'll merge this in. It'll definitely be in 3.10.0.

I've merged this into my local repository. My local repository is not currently in a state where I can push to github, but the next time I push to github, it will be there.

Thanks very much for the patch.