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Multiple Database Connections in Ruby on Rails
A transaction acts on a single database connection. If you have multiple class-specific databases, the transaction will not protect interaction among them. One workaround is to begin a transaction on each class whose models you alter:
Student.transaction do
Course.transaction do
course.enroll(student)
student.units += course.units
end
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This is a poor solution, but fully distributed transactions are beyond the scope of ActiveRecord.