I have a callback (before_save) that I want to trigger only when
certain fields within a record have changed. For example given a user
record with 'username', 'password' and 'date_of_birth' I would like
the callback to do something only when the 'username' or 'password'
changes or when the 'date_of_birth' changes from nil to something
real. For example, how would I write...
before_save :audit_changes
def audit_changes
if old.username != new.username
audit("The username has changed from #{old.username} to #{new.username})
end
if old.password != new.password
audit("The user has changed their password")
end
if old.date_of_birth == nil and new.date_of_birth != nil
audit("The user has finally set their date of birth")
end
end
Now this is just a little example of what I want to do, don't get hung
up on the example, but how can I write this?
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