From: "Faizel Dakri" <webobjects-dev@wocommunity.org>
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Subject: Re: [WO-DEV] Re: ERXGenericRecord takeValueForKey
Date: Mon, 30 Aug 2021 09:35:29 -0500
Message-Id: <415CC763-461E-4E68-A0BA-7D516AC5F19E@dakri.com>
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To: WebObjects & WOnder Development <webobjects-dev@wocommunity.org>

Oops, sorry, I see that you=E2=80=99re already overriding canAccessFieldsDir=
ectly() to return false.=20

F

--=20
Faizel Dakri


> On Aug 30, 2021, at 9:29 AM, Faizel Dakri <webobjects-dev@wocommunity.org>=
 wrote:
>=20
> =EF=BB=BFIf your EOs are inheriting from EOGenericRecord, they most likely=
 are implementing EOKeyValueCoding, which is an extension to NSKeyValueCodin=
g that uses a couple of special methods to set/retrieve model properties:
>=20
>    - takeStoredValueForKey()
>    - storedValueForKey()
>=20
> If you want your EO to behave using standard NSKeyValueCoding rules, try o=
verriding canAccessFieldsDirectly() in your EO class (static method) to retu=
rn false.=20
>=20
> F
>=20
> --=20
> Faizel Dakri
>=20
>=20
>> On Aug 25, 2021, at 8:50 PM, webobjects-dev@wocommunity.org wrote:
>>=20
>> =EF=BB=BFHi there,
>>=20
>> I must be missing something darn obvious; looks like I've missed EOF 101 s=
omehow :/
>>=20
>> My EO class, which extends ERXGenericRecord, does not implement modelled p=
roperty setters. Thus, I assumed takeValueForKey would always fall through h=
andleTakeValueForUnboundKey. Seems not.
>>=20
>> I've overridden the methods like this:
>>=20
>> =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 takeStoredValueFo=
rKey), not relevant, for it is never called
>> }
>> ...
>> }
>> =3D=3D=3D
>>=20
>> It does NOT work as (I've na=C3=AFvely) presumed.
>>=20
>> When eo.takeValueForKey(o,key) is called, I can always see =E2=80=9C???ta=
keValueForKey=E2=80=9D (naturally), but I *never ever* see =E2=80=9C???handl=
eTakeValueForUnboundKey=E2=80=9C for any key amongst modelled attributes. No=
thing other (known to me) gets called =E2=80=94 not even takeStoredValueForK=
ey, which I've also overridden to log =E2=80=94, but the value is set all ri=
ght in the EO.
>>=20
>> Only if foo is a random (non-existing, non-modelled) string, I can see =E2=
=80=9C???handleTakeValueForUnboundKey=E2=80=9C.
>>=20
>> Looks like there's some trick in NSKeyValueCoding.DefaultImplementation.t=
akeValueForKey which recognises modelled attributes in EOGenericRecord and f=
ill their values directly, without falling to handleTakeValueForUnboundKey?!=
? Weird.
>>=20
>> Or I must be doing something very far wrong.
>>=20
>> Is this documented somewhere? Far as I can say, neither ERXGenericRecord n=
or EOGenericRecord nor NSKeyValueCoding.DefaultImplementation mentions anyth=
ing special; NSKeyValueCoding.DefaultImplementation.takeValueForKey should s=
imply check for the accessor (either with or without the _ prefix) and if th=
ere is none (which there indeed is not), fall to handleTakeValueForUnboundKe=
y. What am I missing here?
>>=20
>> Thanks,
>> OC
>>=20
>>=20
>>=20
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>>=20
>>=20
>=20
>=20
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>=20