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Re: WO5.4: Generics for objectsWithFetchSpecification ???
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Re: WO5.4: Generics for objectsWithFetchSpecification ???


  • Subject: Re: WO5.4: Generics for objectsWithFetchSpecification ???
  • From: "Mr. Pierre Frisch" <email@hidden>
  • Date: Sun, 13 Jan 2008 17:53:48 -0800

Actually a raw fetch return a

NSArray<NSDictionary<String, ?>>

Pierre
--
Pierre Frisch
email@hidden


On Jan 13, 2008, at 15:19, Lachlan Deck wrote:

Slight correction...

On 14/01/2008, at 8:48 AM, Lachlan Deck wrote:

Actually, having thought about it a bit more, I think it's not such a nice improvement. i.e., it's not the user that determines what type of object is returned for a raw-row fetch; that's a function of the framework.

So the only way I can see this moving forward:

* deprecate the flag in EOFetchSpecification
* adjust EOEditingContext as follows...

public NSArray<T> objectsWithFetchSpecification(EOFetchSpecification<T> fetchSpec) {...}

public NSArray<?> rawObjectsWithFetchSpecification(EOFetchSpecification fetchSpec) {....}
(Seeing as raw fetches can return an Integer, Long, String, NSDictionary depending on the query/calculation)


What do you think?

with regards, --

Lachlan Deck

On 09/01/2008, at 6:13 AM, Mr. Pierre Frisch wrote:

This would be a pretty radical change that would break a lot of code. At the moment the raw rows is a boolean in the EOFetchSpecification, I agree that this would be a nice improvement but are we ready for it?

Pierre
--
Pierre Frisch
email@hidden


On Jan 7, 2008, at 20:03, Mike Schrag wrote:

.... pretend .... you ... never mentioned that?

I suppose your fetch spec would then be EOFetchSpecification<NSDictionary> and maybe it would just work out?

ms

On Jan 7, 2008, at 10:04 PM, Mr. Pierre Frisch wrote:

And what do you do with raw rows?

Pierre
--
Pierre Frisch
email@hidden


On Jan 7, 2008, at 7:36, Mike Schrag wrote:

NSArray<MyEO> = ec.objectsWithFetchSpecification(spec, MyEO.class)
I think generic EOFS would be better ... Passing in Class objects to fulfill generics always feels a bit like hackery. It's really cheating -- you're basically casting without using cast syntax, because you can't enforce that the class you put in is actually related to the objects of the fetch spec in any way, so it's as unsafe as an arbitrary cast.

public <T> NSArray<T> objectsWithFetchSpecification(EOFetchSpecification<T> fetchSpec) { ... }

then

EOFetchSpecification<Person> fetchSpec = ...;
NSArray<Person> people = ec.objectsWithFetchSpecification(fetchSpec);


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  • Follow-Ups:
    • Re: WO5.4: Generics for objectsWithFetchSpecification ???
      • From: Lachlan Deck <email@hidden>
References: 
 >WO5.4: Generics for objectsWithFetchSpecification ??? (From: Gaastra Dennis - WO Lists <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: Mike Schrag <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: Anjo Krank <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: Mike Schrag <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: "Mr. Pierre Frisch" <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: Mike Schrag <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: "Mr. Pierre Frisch" <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: Lachlan Deck <email@hidden>)
 >Re: WO5.4: Generics for objectsWithFetchSpecification ??? (From: Lachlan Deck <email@hidden>)

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