Equiv. ruby's method_missing

Hi all,

Rail's Activerecord uses Ruby's method_missing to implement dynamic
finders such as find_by_#column_name()

which is done by defining in the receiver...
def method_missing(method_id, *arguments)
     if match = /find_(all_by|by)_([_a-zA-Z]\w*)/.match(method_id.to_s)
        finder, deprecated_finder = determine_finder(match),

determine_deprecated_finder(match)
       attribute_names = extract_attribute_names_from_match(match)
       super unless all_attributes_exists?(attribute_names)
<snip>

Does Smalltalk have some way of emulating this?
I am reading Smalltalk-80 books and don't see anything there. Is the
current language support such callback hooks (and others which trap
object create events and such?)

I was inspired to study this when I read an old thread (2005) on the
seaside list about writing an activerecord like layer for
Seaside...although GLORP may be a better option in the long run. This
is pretty much an academic excercise for me now.

THanks for your help,

bakki
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The "equivalent" method is

doesNotUnderstand: aMessage
     "Handle the fact that there was an attempt to send the given message to the receiver but the receiver does not understand this message (typically sent from the machine when a message is sent to the receiver and no method is defined for that selector)."
    "Testing: (3 activeProcess)"

Is defined in the Object Class.




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> Does Smalltalk have some way of emulating this?
>
> bakki

doesNotUnderstand, and btw, Smalltalk doesn't need to "emulate" this, Ruby
copied this feature from Smalltalk.

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Ah! I was looking for the wrong msg. THanks for pointing this out. Now
I see it.,,and Ramon, I sort of had a gut feel that Ruby got it from
Smalltalk but didn't realize it was renamed to method_missing. Had I
dug deep enought I would have found it especially since I'd seen it
when doing Seaside coding. Sorry about posting a bit too hastily.

-bakki

On 8/23/06, Humber Aquino <[hidden email]> wrote: _______________________________________________
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> Ah! I was looking for the wrong msg. THanks for pointing this
> out. Now I see it.,,and Ramon, I sort of had a gut feel that
> Ruby got it from Smalltalk but didn't realize it was renamed
> to method_missing. Had I dug deep enought I would have found
> it especially since I'd seen it when doing Seaside coding.
> Sorry about posting a bit too hastily.
>
> -bakki

Don't be sorry, there are no stupid questions, I was just messing with you a
bit.

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