Collapse your rails migrations
gem install migration_collapser
First, load your production database:
mysql -u root my_dev_db < my_production_db.sql
Dump your production database (without data) in db/migrate/initial_schema.sql
mysqldump -u root --no-data my_dev_db > db/migrate/initial_schema.sql
Run the migration collapser from RAILS_ROOT:
collapse_migrations