Yes, the properties of follow and followed default to 0, so I created them.
But my question about the transaction
понедельник, 27 января 2014 г., 17:48:40 UTC+4 пользователь Michael Hunger
написал:
>
> Works for me, if you created both user nodes with initial properties
>
> create (:User {id:1,follow:0, followed:0})
>
> otherwise you have to adapt for null values:
>
> *MATCH (a:User), (b:User)*
> *WHERE a.id <http://a.id/> = 1 AND b.id <http://b.id/> = 2*
> *merge (a)-[r:FOLLOW]->(b) ON CREATE SET a.follow =
> coalesce(a.follow,0)+1, b.followed = **coalesce(**b.followed,0)+1*
> *RETURN r*
>
>
>
> On Mon, Jan 27, 2014 at 11:53 AM, ivan limonov <[email protected]<javascript:>
> > wrote:
>
>> Hello
>> I run the following command in neo4j using Cypher:
>> *MATCH (a:User), (b:User)*
>> *WHERE a.id <http://a.id> = 1 AND b.id <http://b.id> = 2*
>> *merge (a)-[r:FOLLOW]->(b) ON CREATE SET a.follow = a.follow+1,
>> b.followed = b.followed+1*
>> *RETURN r*
>> Is it possible that the counter follow or followed is not updated?
>> I mean partial update.
>> Do I need to resort on such a query to transactions that would avoid a
>> partial update?
>>
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