Graql-haskell: How to run the test program?

[Jeff_Brown]

After cloning graql-haskell, I can run "stack ghci". I cannot run "stack test", though; when I try, I get the following error:

jeff@jbb-thinkpad:~/prog_langs/hask/graql/graql-haskell$ stack test
graql-0.1.0.0: build (lib + test)
Preprocessing library graql-0.1.0.0...
Preprocessing test suite 'test' for graql-0.1.0.0...
setup-Simple-Cabal-1.24.0.0-ghc-8.0.1: can't find source for Main in
.stack-work/dist/x86_64-linux/Cabal-1.24.0.0/build/test/test-tmp, test
             
--  While building package graql-0.1.0.0 using:
      /home/jeff/.stack/setup-exe-cache/x86_64-linux/setup-Simple-Cabal-1.24.0.0-ghc-8.0.1 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.24.0.0 build lib:graql test:test --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
Progress: 1/2
jeff@jbb-thinkpad:~/prog_langs/hask/graql/graql-haskell$

[filipe]

Hi @Jeff_Brown. Thanks for telling us about this issue. The creator of the driver @felix is busy trying to reproduce the issue. He will give you an answer shortly.

[felix]

Hey @Jeff_Brown. I had a look and found the problem. We had main.hs in lowercase, instead of Main.hs. Mac OSX is more lenient, so I didn't notice this problem.

If you pull it down it should be fixed now!

[Jeff_Brown]

It works! Thanks, Felix!

It demonstrates how graql-haskell turns haskell code into graql queries. It does not demonstrate how, from haskell, to create, mod9ify and query a database. Might a demo for that be in the works?

[felix]

It's true, it only covers the bare basics. There's a (very short) example of how to build and execute a query in the README: https://github.com/graknlabs/graql-haskell

query = match
    [ x `isa` person
    , rel [husband .: x, wife .: y] `isa` marriage
    ] & select [y]

main = do
    result <- runMatch query
    print result

However, I'm definitely planning to write another post where I load a real dataset and query it in Haskell.