ActiveRecord::Transactions::ClassMethods
module ActiveRecord::Transactions::ClassMethods
Active Record Transactions
Transactions are protective blocks where SQL statements are only permanent if they can all succeed as one atomic action. The classic example is a transfer between two accounts where you can only have a deposit if the withdrawal succeeded and vice versa. Transactions enforce the integrity of the database and guard the data against program errors or database break-downs. So basically you should use transaction blocks whenever you have a number of statements that must be executed together or not at all.
For example:
ActiveRecord::Base.transaction do david.withdrawal(100) mary.deposit(100) end 登录查看完整内容