%Library.ListOfDataTypes to $LIST conversion

Question

Question

Blaise ZARKA · Apr 15, 2020

#ObjectScript #InterSystems IRIS

Hi,
Do you know the best way to convert a %Library.ListOfDataTypes instance to a $LIST format string?

Thanks,
Blaise

Discussion (10)0

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Eduard Lebedyuk · Apr 15, 2020

I think fairly straightforward approach works best

set l = ##class(%ListOfDataTypes).%New()
do l.Insert(1)
do l.Insert(2)
do l.Insert(4)
set lb = ""
for i=1:1:l.Count() { set lb = lb _ $lb(l.GetAt(i)) }
zw lb
>lb=$lb(1,2,4)

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score 0 · Answer 1 · 2020-04-15T16:08:11-04:00

thanks @Eduard Lebedyuk
Yes it works great. that's the way we did it. So no direct straight serialization system function. ;-)

score 0 · Answer 2 · 2020-04-15T17:29:33-04:00

There is actually. %GetSerial method builds a $lb from %ListOfDataTypes and %SetSerial does the reverse.

Both of these methods are private though. You can subclass %ListOfDataTypes and publish them.

score 1 · Answer 3 · 2020-04-16T04:05:01-04:00

Blaise ZARKA · Apr 16, 2020

Oh great!
Please InterSystems developers, make these useful methods public and supported ;-)

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score 0 · Answer 4 · 2020-04-16T05:09:13-04:00

Eduard Lebedyuk · Apr 16, 2020

You can request new features/enhancements in WRC tickets.

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score 0 · Answer 5 · 2020-04-16T06:06:47-04:00

%Collection.ListOfDT Serialize and deserialize methods seem like doing the trick.
But I found the documentation is a little bit ambiguous as the sample in the header refers itself to %ListOfDataTypes.

https://docs.intersystems.com/iris20201/csp/documatic/%25CSP.Documatic.c...

score 0 · Answer 6 · 2020-04-16T06:11:07-04:00

Eduard Lebedyuk · Apr 16, 2020

%Collection classes are internal and not to be used.

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score 0 · Answer 7 · 2020-04-16T06:23:25-04:00

You're sure about that?
I understand these methods should only be used when the list property comes from a %Persistent object, but new instance with %New method is not allowed.

score 1 · Answer 8 · 2020-04-16T06:40:00-04:00

Well, %Collection classes are the implementation of these constructs:

Property X As List Of Type
Relationships

You can call their methods but do not explicitly create objects of these classes.

score 1 · Answer 9 · 2020-04-16T06:50:37-04:00

And you can request it here in case you don't have WRC account or/if you want to make it public and get votes.