Want to set up mysql master-slave replications in rails app.
Are there plugins/db adapters available for Rails 3? Does the Masochism plugin work properly with rails 3?
Try Octopus, which supports both rails3 and rails2.3: https://github.com/tchandy/octopus
Masochism, DbCharmer, data_fabric et al will probably never be updated for Rails3 since so many ActiveRecord internals have drastically changed.
data_fabric also now claims support for Rails 3.0.7 https://github.com/mperham/data_fabric
and seamless_database_pool has been patched to support Rails 3 (but looks like it hasn't been updated in awhile): http://www.williambharding.com/blog/rails/rails-3-slave-database-options-there-are-two/
来源：https://stackoverflow.com/questions/4062113/rails-3-and-mysql-master-slave-replications