From: "ocs@ocs.cz" <webobjects-dev@wocommunity.org>
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Date: Thu, 26 Aug 2021 03:50:09 +0200
Subject: ERXGenericRecord takeValueForKey
Message-Id: <860EC8B1-6908-400E-BC84-6795F5E39B3C@ocs.cz>
To: WebObjects & WOnder Development <webobjects-dev@wocommunity.org>

Hi there,

I must be missing something darn obvious; looks like I've missed EOF 101 =
somehow :/

My EO class, which extends ERXGenericRecord, does not implement modelled =
property setters. Thus, I assumed takeValueForKey would always fall =
through handleTakeValueForUnboundKey. Seems not.

I've overridden the methods like this:

=3D=3D=3D
class OCSEnterpriseObject extends ERXGenericRecord {
  static boolean canAccessFieldsDirectly { NO }
  void takeValueForKey(value,String key) {
    println "???takeValueForKey $key"
    //super.takeValueForKey(value, key) // precisely same behaviour as =
with the thing below, no difference
    =
NSKeyValueCoding.DefaultImplementation.takeValueForKey(this,value,key)
  }
  void handleTakeValueForUnboundKey(value,String key) {
    println "???handleTakeValueForUnboundKey $key"
    // ... some stuff to simulate setter (eventually using =
takeStoredValueForKey), not relevant, for it is never called
  }
  ...
}
=3D=3D=3D

It does NOT work as (I've na=C3=AFvely) presumed.

When eo.takeValueForKey(o,key) is called, I can always see =
=E2=80=9C???takeValueForKey=E2=80=9D (naturally), but I *never ever* see =
=E2=80=9C???handleTakeValueForUnboundKey=E2=80=9C for any key amongst =
modelled attributes. Nothing other (known to me) gets called =E2=80=94 =
not even takeStoredValueForKey, which I've also overridden to log =E2=80=94=
, but the value is set all right in the EO.

Only if foo is a random (non-existing, non-modelled) string, I can see =
=E2=80=9C???handleTakeValueForUnboundKey=E2=80=9C.

Looks like there's some trick in =
NSKeyValueCoding.DefaultImplementation.takeValueForKey which recognises =
modelled attributes in EOGenericRecord and fill their values directly, =
without falling to handleTakeValueForUnboundKey?!? Weird.

Or I must be doing something very far wrong.

Is this documented somewhere? Far as I can say, neither ERXGenericRecord =
nor EOGenericRecord nor NSKeyValueCoding.DefaultImplementation mentions =
anything special; NSKeyValueCoding.DefaultImplementation.takeValueForKey =
should simply check for the accessor (either with or without the _ =
prefix) and if there is none (which there indeed is not), fall to =
handleTakeValueForUnboundKey. What am I missing here?

Thanks,
OC