migrations via script || migrate multiple DB's

rubyonrails-talk
1

greetings,

I'm wondering if anyone else has faces the task of migrating multiple databases? How can one do this is an automated fashion?

Currently I'm running usual "rake db:migrate" from cmd, where I'll manually edit the database.yml :database line to indicate the current DB. This is done is a sequential fashion. While this is fine for working out the migrations, it's going to be real tedious for migrating the 50+ production databases.

Thus I'd like to come up with a ruby script that will run the migration for each DB automatically.

Two issues I see... 1. how does one run migrations from ruby? is it a `/path_to_app/rake db:migrate`, generally I like to avoid cmd line executions in scripts

2. how does one programmatically reset the migration connection? I know I can do a "model_obj.establish_connection" for ActiveRecord, but I don't see anything similar for migration.

Having these resolved, I envision something like...

database_list.each{|db|   migration.connection(db)   migration.run }

Thank You,

andy koch

2

HI Andy,

I believe you need to be looking at Capistrano. Depending upon your situation.

And, if I may ask, what kind of app is using 50+ identical databases?

3

Peter Fitzgibbons schrieb:

HI Andy,

I believe you need to be looking at Capistrano. Depending upon your situation.

And, if I may ask, what kind of app is using 50+ identical databases?

-- Peter Fitzgibbons

ah, I was thinking of Cap, but I'm fairly hackish with it. I'll see where that leads me.

what kind of app? sure you may ask, it's an inherited PHP app that runs Firebird. the app manages text strings for desktop apps where each DB is a different branch

I didn't design it, I inherited it, and now I'm rail-ifying it.

/ak

4

Without knowing more detail, it sounds like your design could use some refactoring-love along the way. Maybe a couple habtm tables with strings/context relationships?

Good luck!