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Can't refer to UserId in an Id field #1149

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#1256
Closed
Can't refer to UserId in an Id field#1149
#1256
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bug
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2.13

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@parsonsmatt
parsonsmatt
opened on Oct 31, 2020

This QQ breaks with an error that UserId is not in scope.

share [ mkPersist sqlSettings ] [persistLowerCase|

User
    name    String

Profile
    Id      UserId
    email   String
|]

However, using UserId is usually fine in other contexts. So why isn't this working?

Activity

  1. parsonsmatt
    added
    bug
    on Nov 19, 2020

  2. parsonsmatt commented on Apr 23, 2021

    @parsonsmatt
    parsonsmatt
    on Apr 23, 2021
    CollaboratorAuthor

    I think I figured out what's going on here

    There's a type SqlTypeExp that, when lifted into a Q Exp, will either splice in the SqlType directly, or, if it's a SqlTypeExp FieldType, will translate the FieldType into a Template Haskell Type, and then splice a call like [| sqlType (Proxy :: Proxy $(fieldTypeToType fieldType) ) |].

    There's a bunch of other tricks, and I guess what's happening is that we're trying to lookup a UserId before the alias is defined.

  3. parsonsmatt
    added this to the 2.13 milestone on May 4, 2021
  4. parsonsmatt
    linked a pull request that will close this issueQuasiQuoter Improvements #1256on May 4, 2021
  5. parsonsmatt
    closed this as completedon May 4, 2021
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