Catch exception when executing Cypher script

[7vingt]

Catch exception when executing Cypher script

[rdvdijk]

Can you provide an example set of Cypher-queries how to trigger the UniquePathNotUniqueException?

[rdvdijk]

Ah, I see what the problem is. The NeographyError contains the error code (400), the message (The pattern a-[r:FOO]->b produced multiple possible paths, and that is not allowed) and the stacktrace (very long) without the initial exception.

I will add a field to the NeographyError with the original Exception, in this case UniquePathNotUniqueException.

When I have finished you can do:

begin
  neo.execute_query("START a=node(1), b=node(2) CREATE UNIQUE a-[r:FOO]->b RETURN r")
rescue => e
  puts e.exception # => "UniquePathNotUniqueException"
end

I'll let you know when I'm done!

[rdvdijk]

I decided to just add this exception to Neography, makes more sense than my previous comment. So:

begin
  neo.execute_query("START a=node(1), b=node(2) CREATE UNIQUE a-[r:FOO]->b RETURN r")
rescue UniquePathNotUniqueException
  puts "that path is not unique!"
end

[rdvdijk]

@maxdemarzi, could you release a version with this change? (See commit 525ff47)

[7vingt]

Thanks a lot rdvdijk, i will test the new behaviour as soon it will be released.

[maxdemarzi]

Released 1.0.4

[rdvdijk]

👍

[7vingt]

Nice, thanks guys