How to trace source sentence with multiple keys?

[senwu]

I want to trace the source sentence for my extraction based on multiple keys, and I write something like:

@source
sentences(
@key
doc_id text,
@key
section_id text,
ref_doc_id text,
@key
sent_id int,
@searchable
words text[],
lemmas text[],
poses text[],
ners text[],
dep_paths text[],
dep_parents int[]).

@Extraction
gene_mentions(
id bigint,
@references(relation="sentences", column="doc_id", alias="sent_gene")
doc_id text,
@references(relation="sentences", column="section_id", alias="sent_gene")
section_id text,
@references(relation="sentences", column="sent_id", alias="sent_gene")
sent_id int,
wordidxs int[],
@key
mention_id text,
supertype text,
subtype text,
@searchable
entity text,
@searchable
words text[],
@navigable
is_correct boolean).

But it doesn't work, am I missing something? How can I use multiple keys to find the source sentence?

[netj]

That's the intended correct way to do so. I haven't tested multi key schema seriously so there may be some bug. Could you be more specific at which step it doesn't work? Does the data seem to get into index? You don't get back search results? Or see source or parent from the result but not rendered?

[senwu]

I got something in parents,
{
_index: "genomics",
_type: "gene_mentions",
_id: "23383340_Body.0_109_14_ENSG00000170571:EMB_CANONICAL_SYMBOL",
_score: 1,
_source: {
wordidxs: [...],
subtype: null,
is_correct: true,
doc_id: "23383340",
sent_id: 109,
supertype: "CANONICAL_TRUE",
id: null,
section_id: "Body.0",
entity: "ENSG00000170571:EMB",
words: [...],
mention_id: "23383340_Body.0_109_14_ENSG00000170571:EMB_CANONICAL_SYMBOL"
},
parent: {
_index: "genomics",
_type: "sentences",
_id: "23383340@Body.0@109",
found: false
}
}

And the sentence exists (doc_id = '23383340', section_id = 'Body.0', and sent_id = '109'), but it doesn't render in the website.
FYI: If I change source.words to extraction.doc_id, it appears.

Am I setting something wrong?