ruby - Running new rails app *and* legacy app on top of the same database -

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i'm working on project we're building several new rails apps intended launched running along side legacy app need use same database. legacy database uses oracle.

i believe ideal cut-over cleanly , not have both new , legacy apps running on same db, in case it's not possible. legacy app large , runs pretty complex system that's core of business. intention replace bit @ time.

but require launch rails apps each handling part of application -- , sharing database operating legacy app.

i've looked around quite bit , haven't been able find definitive rails docs describing issues might run -- or if it's possible. know heroku supports running multiple rails apps pointing @ single database. i've found lots of discussion on people doing this, nothing pinpoints potential risks are.

is possible? specific problems occur?

edit: clarify, legacy application not rails-based. it's based on different technology.

while possible, you'll have careful, if have 2 systems performing migrations on same tables.

ideally 1 application "owns" database , assumes responsibility migrating various tables, it's possible split tables owned 1 application , other. schema_migrations table should able track these independently.

you run trouble if have make modifications same table in both applications there no way ensure 1 modification made before other, migration chains independent.

if you're careful avoid sort of thing, it's fine.

be sure have robust test environment simulate happens when both applications exercised in tandem.


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