与Beam一起使用newtype

I used to have Email as type Email = T.Text.

我将其更改为：

newtype Email = Email { unEmail :: T.Text }
    deriving (Show, Eq)

此更改在以下方面产生了错误：

instance Table UserT where
   data PrimaryKey UserT f = UserId (Columnar f T.Text) deriving (Generic, Beamable)
   primaryKey = UserId . _userAddressEmail

错误：

backend/src/Backend.hs:145:17-22: error:
    • Couldn't match type ‘Columnar column T.Text’
                     with ‘Columnar column Email’
      Expected type: Columnar column Email -> PrimaryKey UserT column
        Actual type: Columnar column T.Text -> PrimaryKey UserT column
      NB: ‘Columnar’ is a non-injective type family
    • In the first argument of ‘(.)’, namely ‘UserId’
      In the expression: UserId . _userAddressEmail
      In an equation for ‘primaryKey’:
          primaryKey = UserId . _userAddressEmail
    • Relevant bindings include
        primaryKey :: UserT column -> PrimaryKey UserT column
          (bound at backend/src/Backend.hs:145:4)
    |
145 |    primaryKey = UserId . _userAddressEmail
    |                 ^^^^^^

我试过了：

instance Table UserT where
   data PrimaryKey UserT f = UserId (Columnar f T.Text) deriving (Generic, Beamable)
   primaryKey = UserId . (unEmail _userAddressEmail)

但是我得到这个错误：

backend/src/Backend.hs:145:27-51: error:
    • Couldn't match expected type ‘UserT column
                                    -> Columnar column T.Text’
                  with actual type ‘T.Text’
    • Possible cause: ‘unEmail’ is applied to too many arguments
      In the second argument of ‘(.)’, namely
        ‘(unEmail _userAddressEmail)’
      In the expression: UserId . (unEmail _userAddressEmail)
      In an equation for ‘primaryKey’:
          primaryKey = UserId . (unEmail _userAddressEmail)
    • Relevant bindings include
        primaryKey :: UserT column -> PrimaryKey UserT column
          (bound at backend/src/Backend.hs:145:4)
    |
145 |    primaryKey = UserId . (unEmail _userAddressEmail)
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^
backend/src/Backend.hs:145:35-51: error:
    • Couldn't match expected type ‘Email’
                  with actual type ‘UserT f0 -> Columnar f0 Email’
    • Probable cause: ‘_userAddressEmail’ is applied to too few arguments
      In the first argument of ‘unEmail’, namely ‘_userAddressEmail’
      In the second argument of ‘(.)’, namely
        ‘(unEmail _userAddressEmail)’
      In the expression: UserId . (unEmail _userAddressEmail)
    |
145 |    primaryKey = UserId . (unEmail _userAddressEmail)
    |                                   ^^^^^^^^^^^^^^^^^

I thought unEmail would unwrap the type?

这是条目：

data UserT f
    = User
    { _userAddressEmail                 :: Columnar f Email
...