ArangoDB最短路径错误AQL 2.8

Question

we are trying to switch to "3.0 style" of graph functions.

We run the example of the documentation:

FOR v, e IN OUTBOUND SHORTEST_PATH 'circles/A' TO 'circles/D' GRAPH 'traversalGraph' RETURN [v._key, e._key]

and it works on ArangoDB 3.0, but it doesn't in ArangoDB 2.8.11 The error is:

"errorNum":1501,"errorMessage":"syntax error, unexpected quoted string near '' TO 'circles/D' GRAPH 'traversa...' at position 1:46 (while parsing)"

Our goal is switch all queries into "3.0 style", because we want upgrade the database to 3.0, but we would like also backward compatibility. We have read https://docs.arangodb.com/cookbook/AQL/MigratingGraphFunctionsTo3.html and there is a section that talks about shortest_path. We tried the example, but the error is above.

Can somebody help us?

Thank you very much.

Best regards,

Daniele

Answer 1

The SHORTEST_PATH implementation you mentioned was added with 3.0.

In ArangoDB 2.8 it didn't exist yet , and thus it won't understand this newer syntax. So I'm afraid you won't be able to use these queries with 2.8.

If you want your application to be flexible between these two ArangoDB versions, you will have to prevail two code paths in your Application at the time being.

This is a bit uncomfortable, but others found the efford to be worth while , I hope you will too ;-)