Cypher: CREATE with bidirectional rel fails

[jotomo]

neo4j-sh (0)$ create n<-[:r]->m;             
PatternException: Relationships need to have a direction when used to CREATE.
neo4j-sh (0)$ dbinfo -g Kernel KernelVersion
{"KernelVersion": "Neo4j - Graph Database Kernel 2.0.0-M06"}

I've tested with a snapshot of cypher.jar, but that didn't help.

[jexp]

There is no bidirectional relationship in Neo and this restriction was added to make relationship creation a more explicit concern.

[cleishm]

Relationships in Neo4j always have a direction, even though Cypher can ignore it by allowing you to specify directionless/bidirectional patterns. However, ‘CREATE` must actually create the relationship, and so requires the direction to be specified. Of course, you can still ignore it in all future queries.

Do you have any suggestion for how we could make that more clear in the error message or documentation?

[jotomo]

Thanks for educating me on this :-) The console got me confused which accepts the synax (e.g. http://console.neo4j.org/r/a6rw5t), at closer inspecting I see it created a relationship from end node to start node - one direction. So I guess the console has a version of 2.0 that doesn't throw this error message.
About making the error message clearer, is unidirectional a term that's common enough to be understood?
e.g. Relationships need to be unidirectional when used to CREATE

[jexp]

Console doesn't yet run M06 as it depends on infrastructure that is no longer supported by M06.

[jotomo]

@cleishm So if this is error is thrown only in M06+ then there are probably more people who are gonna see this message, so it'd be nice to have it be clear. How about this, a bit longer, but explains more as well Only directed relationships are supported in CREATE, while MATCH allows to ignore direction. Let me know what works and I'll open a PR :-)

[jexp]

Love it. Sounds like great message, please do Johannes.