How to filter on type of object?

[gmermoud]

Hello,

I have a schema where four distinct types A, B, C, D inherit from the same abstract type X.

Now, I have a query of the form:

select X {
   field1,
   field2
} 

But I would like to filter out objects of class D, such that:

select X {
   field1,
   field2
} filter . is (A|B|C)

What is the correct way to achieve this?

[gmermoud]

OK, that's rubber duck debugging at its best. Upon hitting "send", I immediately thought of:

select X {
   field1,
   field2
}[is A]

which works.

However, the following seems to be unsupported (I get the error QueryError: complex type expressions are not supported here):

select X {
   field1,
   field2
}[is (A|B|C)]

What is the correct way to achieve what I want then?

[raddevon]

Update: This method from @elprans is better than the one I suggested:

filter X is (A | B | C) should work and is the idiomatic way of filtering by type. Filtering by __type__.name works, but is somewhat less efficient.

Try this:

select X {
  field1,
  field2
} filter .__type__.name = 'default::A'
or .__type__.name = 'default::B'
or .__type__.name = 'default::C';

assuming the types A, B, and C are all in the default module.

[gmermoud]

This works, thanks a lot! I suppose the following syntax would be nice: ``` select X { field1, field2 } filter . is (A|B|C) ``` Assuming that . is indeed a shorthand for the object itself. Thanks a lot for your help. Greg

…

On 12 Apr 2023, at 15:11, Devon Campbell ***@***.***> wrote: Try this: select X { field1, field2 } filter .__type__.name = 'default::A' or .__type__.name = 'default::B' or .__type__.name = 'default::C'; assuming the types A, B, and C are all in the default module. — Reply to this email directly, view it on GitHub <#5333 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AALX5MBK6ATQMIKDCLMYR3LXA2SXNANCNFSM6AAAAAAW3VAFPI>. You are receiving this because you authored the thread.

[elprans]

filter X is (A | B | C) should work and is the idiomatic way of filtering by type. Filtering by __type__.name works, but is somewhat less efficient.

[gmermoud]

@elprans thanks a lot! Indeed, I had missed this construct.

[gmermoud]

Actually, based on @elprans's reply above, the correct way to achieve this is:

select X {
  field1,
  field2
} filter X is (A | B | C)

The following also works:

select X {
  field1,
  field2
} filter X is not D

Thanks all!