WIP: Update deps for lts 18.10 -- Issue #205

[lowderdev]

Issue #205

My plan of attack was as follows:

• run yesod-scaffold build
• check error message like:

    persistent version 2.13.1.2 found
        - PROJECTNAME requires >=2.9 && <2.11

• bump dep to next minor version -- error says 2.13.1.2 found, so bumped <2.11 to <2.14

However I also ran into this error:

    classy-prelude-yesod not found
        - PROJECTNAME requires ==1.5.*

I guess classy-prelude-yesod doesn't ship with lts 18.10, and I don't see a stack.yaml at the root level of the project that I could add extra-deps to.

Sorry I couldn't get further than this! Any guidance on how to get passed this dependence on classy-prelude-yesod?
My guess is that possible paths forward are:

• try bumping to a lower lts
• update classy-prelude-yesod to work with lts 18.10
• figure out a way to add extra-deps to the scaffold

Thoughts? Thanks in advance

[snoyberg]

I didn't remember that classy-prelude-yesod isn't in LTS. I think either adding it in, or modifying the scaffold to not use classy-prelude-yesod, are both good approaches here.

[malteneuss]

@lowderdev
You probably need to add

extra-deps:
  - classy-prelude-yesod-1.5.0

to stack.yaml

edit: i've just seen that there's no such file in the postgres branch.
@snoyberg Is there some other way to add this setting? The alternative of removing classy-prelude-yesod seems to be stuck in #194 for a long time.