Why need before_validation etc methods be public?

Hi all

I just wondered why a private before_validation method is not called
when an ActiveRecord object is saved? When it’s public, then it works…
Why is that? In my opinion, the before_validation method should
intuitively rather be private…

Thanks
Josh

Joshua M. wrote:

Hi all

I just wondered why a private before_validation method is not called
when an ActiveRecord object is saved? When it’s public, then it works…
Why is that? In my opinion, the before_validation method should
intuitively rather be private…

Thanks
Josh

Nobody knows this?

Hi Josh,

On Tue, 2009-10-13 at 19:50 +0200, Joshua M. wrote:

Nobody knows this?

Make it protected, not private. The link below should help
understanding.

http://weblog.jamisbuck.org/2007/2/23/method-visibility-in-ruby

HTH,
Bill

OK, thank you. I don’t really get why Ruby handles protected this way,
but at least I know how, now. :slight_smile:

On Tue, Oct 13, 2009 at 12:02 PM, Joshua M. <
[email protected]> wrote:

OK, thank you. I don’t really get why Ruby handles protected this way,
but at least I know how, now. :slight_smile:

Most languages which has this protected keyword handles it this way.
Another option would be
to do something like this:

class SomeModel < ActiveRecord::Base

before_validation :some_method

private

def some_method

end

end

Now, the callback is properly registered and the method, some_method,
can
be
properly invoked at the appropriate time.

Good luck,

-Conrad

On Tue, Oct 13, 2009 at 12:50 PM, Joshua M.
[email protected] wrote:

Nobody knows this?

No… it’s just that no one cares :slight_smile:

Ruby’s private and protected members aren’t very private or protected.
It’s more of an “intent” thing than a hard rule.

#!/usr/bin/env ruby

class Foo
private
def hidden
puts “I am hidden”
end
end

f = Foo.new

begin
f.hidden
rescue
puts “Can’t run hidden: #{ $! }”
end

f.send( :hidden )

./private.rb
Can’t run hidden: private method `hidden’ called for #Foo:0xb7c2f92c
I am hidden

What’s happening to you is the filter execution only sees private
methods. It’s looking for the method name, doesn’t find it, and
doesn’t run it. Look to see how it appears and disappears from the
private methods list when you move it around.

u = User.find(:first)
u.private_methods


Greg D.
http://destiney.com/

OK, strange. Anyway, thanks to you guys!

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