Thanks much Michael - your explanation makes sense.
I am using dynamic relationship because this is part of a cypher where my
role (the "Test" I have in my example) is dynamic.
On Mon, Dec 7, 2020 at 7:02 AM 'Michael Hunger' via Neo4j <
neo4j@googlegroups.com> wrote:
> Best to send questions like this to community.neo4j.com
>
> In general if you aggregate, you must not add the thing you want to count
> / aggregate on as an aggregation key, you can use collect on those.
>
> MATCH (echk:REC {id: 'abcdef'})
> OPTIONAL MATCH (p:Person) WHERE p.name CONTAINS 'Shirley'
> WITH collect(p) as people, echk, count(p) as personcnt where personcnt=1
> UNWIND people as p
> MERGE (p)-[:TEST]->(echk)
>
> You don't need apoc.merge.relationship for your case you can just use
> cypher.
>
>
>
> Join our new Community Site & Forum <https://community.neo4j.com>
>
>
> On Mon, Dec 7, 2020 at 12:55 PM 'Shanthi Viswanathan' via Neo4j <
> neo4j@googlegroups.com> wrote:
>
>> I am using neo4j 4.1.3. I have 2 labels : Person and Rec. I need to
>> create a relationship between these 2 only when there exists exactly one
>> person with that last name. When I run the below, relationships are created
>> for all persons with that last name. My code is below:
>>
>> MATCH (echk:REC {id: 'abcdef'}) OPTIONAL MATCH (p:Person) WHERE p.name
>> CONTAINS 'Shirley' WITH p, echk, count(p) as personcnt where personcnt=1
>> CALL apoc.merge.relationship(p, 'Test', {}, {}, echk, {}) YIELD rel RETURN
>> p, echk, rel
>>
>> I have 33 people with "Shirley' and 33 relationships are getting created
>> with that REC. However, there should be no relationship because personcnt
>> <> 1. When I just write
>> OPTIONAL MATCH (p:Person) WHERE p.name CONTAINS 'Shirley' return
>> count(p) -> I get 33 as the value. I am not sure why my where condition is
>> not kicking in.
>>
>>
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