Ruby on Rails

Hi there,

I did the following using git in my rails application:

- creating branch a from master
- creating a migration
- using it on development
- creating a branch b from master
- making fixes whih include a new migration (the migration number is higher than on branch a)
- using it on development
- merging b to masster
- using master on production
- migrate on master works fine

-> everything fine till here

- merging master to branch a because of this important changes, so a is ahead of master not just a fork.
- now I put a copy of the production database to the development database

of course now the migration first created in a is not there, because it never reached master, but because it has a lower number than the last migration in master, rake db:migrate does not do anything.
now I tried to give the migration file a newer number, but then rake db:migrate tells me the table created in the migration would be allready there.  but looking directly inside the database it is not there.

What do I miss and how can I fix this?

note: it could also be because i just changed the db schema from sqlite to mysql2.

it seems that rake db:migrate works on the sqlite, not on thy msql table?

Thanks for help,
Martin