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From: Maik Musall <maik@selbstdenker.ag>
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Date: Tue, 18 Apr 2017 19:06:09 +0200
Subject: Re: in-memory filter by Expression accessing regular methods
Message-Id: <13B2BCE8-E6CA-4192-93D9-9A010FCBAF81@selbstdenker.ag>
References: <D275F318-8D9A-41AB-A660-63FCCC0CFADF@selbstdenker.ag> <CAOUwSGtRWcpstuh6d9oO9JPBoENweK7Hyz5rLdzYMJLevo7GFQ@mail.gmail.com> <EF296E3D-19EC-4A9F-9846-8731000A2EE0@selbstdenker.ag> <CAOUwSGuz2g9EHMp7vtrtBwabZacDPz69HA=riCn9CDK9DyOb6A@mail.gmail.com> <F9783265-EED7-4969-A09C-3E7538D320C5@selbstdenker.ag> <6185480A-9BAA-4B9A-AFB9-CDEE2AC9AC85@wardle.org> <15F28D11-CA92-4982-9EDF-6D96B37382F0@selbstdenker.ag> <CAOy5kzPNAO1s4Awja=y3T8j-nXs=15gm9fOw8LYDNW=SimgXRw@mail.gmail.com>
In-Reply-To: <CAOy5kzPNAO1s4Awja=y3T8j-nXs=15gm9fOw8LYDNW=SimgXRw@mail.gmail.com>
To: user@cayenne.apache.org
archived-at: Tue, 18 Apr 2017 17:06:18 -0000

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Hi Michael,

in the meantime I remembered I had already implemented NSKeyValueCodingAddit=
ions for my DataObject subclass, so I just used that :-)

Maik

> Am 18.04.2017 um 18:23 schrieb Michael Gentry <blacknext@gmail.com>:
>=20
> Hi Maik,
>=20
> I'm late to this, but you likely could've used
> obj.readProperty("responsibleUser") as well.
>=20
> mrg
>=20
>=20
>> On Sun, Apr 16, 2017 at 7:13 AM, Musall, Maik <maik@selbstdenker.ag> wrot=
e:
>>=20
>> Wow, Mark, good guess!
>>=20
>> That's it. Added a get=E2=80=A6 method around each part of the path's acc=
essed
>> methods, and it works. Didn't occur to me at all, because those methods a=
re
>> not getters in the strict sense. But I could have discovered this before,=

>> by looking at the BeanAcccessor implementation. Dang.
>>=20
>> I suppose there is no way in Cayenne to inject a different behaviour for
>> this, through DI or something? It doesn't look like it from the code
>> (BeanAccessor, PropertyUtils, and the readSimpleProperty() method  in
>> CayennDataObject is even marked final). Because I know I will run into th=
is
>> again and again, given the existing large code base.
>>=20
>> Maik
>>=20
>>=20
>>=20
>>> Am 15.04.2017 um 23:18 schrieb Mark Wardle <mark@wardle.org>:
>>>=20
>>> Can't try it as only have phone at the moment but have you tried adding
>> "get" as a prefix to your method declaration?
>>>=20
>>> I still find it difficult to not name getters without the get.
>>>=20
>>> --
>>> Dr. Mark Wardle
>>> Consultant Neurologist, Cardiff, UK
>>> (Sent from my mobile)
>>>=20
>>>=20
>>>> On 13 Apr 2017, at 10:44, Musall, Maik <maik@selbstdenker.ag> wrote:
>>>>=20
>>>> Hi John,
>>>>=20
>>>> can you elaborate that on this example?
>>>>=20
>>>> Previously, I did this to filter:
>>>>=20
>>>>  result =3D ExpressionFactory.matchExp( filterPath, filterValue
>> ).filterObjects( result );
>>>>=20
>>>> Now I tried:
>>>>=20
>>>>  result =3D result.stream()
>>>>      .filter( obj -> PropertyUtils.getProperty( obj, filterPath
>> ).equals( filterValue ) )
>>>>      .collect( Collectors.toList() );
>>>>=20
>>>> Both times, I get:
>>>>=20
>>>> java.lang.IllegalArgumentException: Property 'responsibleUser' is not
>> readable
>>>>=20
>>>> where "result" is like a List<Foo> with Foo being a DataObject that has=

>> a method called "responsibleUser", returning another DataObject subclass.=

>>>>=20
>>>> Maik
>>>>=20
>>>>=20
>>>>> Am 12.04.2017 um 19:11 schrieb John Huss <johnthuss@gmail.com>:
>>>>>=20
>>>>> Ok, you can use property utils in conjunction to call a method using
>>>>> reflection (with a string name)
>>>>>> On Wed, Apr 12, 2017 at 6:07 PM Musall, Maik <maik@selbstdenker.ag>
>> wrote:
>>>>>>=20
>>>>>> Hi John,
>>>>>>=20
>>>>>> how do you mean that? Those filter paths come from the UI, passed on
>> by
>>>>>> the user assembling filter criteria. I wouldn't use string filter
>> paths if
>>>>>> the criteria would be constant.
>>>>>>=20
>>>>>> Maik
>>>>>>=20
>>>>>>> Am 12.04.2017 um 19:03 schrieb John Huss <johnthuss@gmail.com>:
>>>>>>>=20
>>>>>>> Just use a java 8 stream and lambda in addition or instead of.
>>>>>>> On Wed, Apr 12, 2017 at 4:48 PM Musall, Maik <maik@selbstdenker.ag>
>>>>>> wrote:
>>>>>>>=20
>>>>>>>> Hi,
>>>>>>>>=20
>>>>>>>> when filtering a list of objects by expression.filterObjects( list
>> ), is
>>>>>>>> there a way for the expression to access regular methods instead of=

>>>>>> Cayenne
>>>>>>>> db properties?
>>>>>>>>=20
>>>>>>>> Use Case: I have a class A that has several relationships to class
>> B,
>>>>>> and
>>>>>>>> it depends on a number of factors which is relevant in this case. S=
o
>>>>>> there
>>>>>>>> is a method that returns either this or that relation to class B. I=

>>>>>> would
>>>>>>>> like to include the method name in the expression path. (This was
>>>>>> possible
>>>>>>>> in EOF, and I just found that it doesn't work in Cayenne.)
>>>>>>>>=20
>>>>>>>> Thanks
>>>>>>>> Maik
>>>>>>>>=20
>>>>>>>>=20
>>>>>>=20
>>>>>>=20
>>>>=20
>>=20
>>=20

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