I am extremely frustrated and hoping someone can help me. I am trying to get the example code in the Caqti github working working. It’s for a project they call bikereg.
Here are the steps I take:
dune init proj bikereg
cd bikereg
Then I replace bin/dune with the version in the examples directory mentioned above. It contains:
(executable
(name bikereg)
(modules bikereg)
(libraries caqti caqti-dynload caqti-lwt caqti-lwt.unix testlib))
(rule
(alias runtest)
(package caqti-lwt)
(deps (:test bikereg.exe) (alias ../testsuite/drivers) ../testsuite/uris.conf)
(locks /db/bikereg)
(action
(setenv OCAMLPATH ../testsuite
(run %{test} -U ../testsuite/uris.conf))))
Then I edit dune-project to depend on the libraries mentioned in the dune file. After editing, the package section reads:
(package
(name bikereg)
(synopsis "A short synopsis")
(description "A longer description")
(depends ocaml dune caqti caqti-dynload caqti-lwt caqti-lwt.unix testlib)
(tags
(topics "to describe" your project)))
Finally I run:
dune build
I get the output:
Error: The current scope doesn't define package "caqti-lwt".
The only packages for which you can declare elements to be installed in this
directory are:
- bikereg (because of bikereg.opam)
I’ve tried editing bikereg.opam to fix the problem, but it doesn’t help. Moreover the OCaml Quickstart says “Do not update project_name.opam manually! Let dune do it for you.” and says that we should use dune build to do that.
I have no idea what to do now to move forward. Perhaps the Caqti example is just wrong and shouldn’t be referring to caqti-lwt? But caqti-lwt does appear in the github directory for Caqti, so apparently it does exist. I don’t know why there would be a problem in referring to it.
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