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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On Mon, Jan 24, 2011 at 11:49 AM, Peter Hickman <peterhickman386-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:> 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?Active Record has API for that: http://api.rubyonrails.org/classes/ActiveModel/Dirty.html so you basically could test whether username_changed?, for example. The examples in AM::Dirty include the module by hand, but you don''t need to do that in AR models. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Thank you, I''ve been googling away like crazy but forgot to use that magic word *DIRTY*. Damn I knew it was available. Thank you. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.