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Atomic Updates And Performance with ActiveRecord Transactions Discussion

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sally.transfer(bob, 10000), it is not rollback!

why?

class Account < ApplicationRecord
validates :balance, numericality:{ greater_than: 0}

def withdraw(amount)
update(balance: balance - amount)
end

def deposit(amount)
update(balance: balance + amount)
end

def transfer(recipient, amount)
transaction do
withdraw(amount)
recipient.deposit(amount)
end
end
end

must use save! or update!

def withdraw(amount)
update!(balance: balance - amount)
end

def deposit(amount)
update!(balance: balance + amount)
end

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