string - 如何比较相等 Data.Text.Internal.Lazy.Text 和 [Char]？

Question

esqueleto 返回的previousLogItem数据类型包含Data.Text.Internal.Lazy.Text

import           Data.Text.Lazy                        (pack)

previousLogItem <- select $ from $ \l -> do
        orderBy [desc (l ^. LogItemId)]
        limit 1
        return (l ^. LogItemTitle)

后来我尝试使用以下方法进行previousLogItem比较exampleCharList：

[Value (pack currentWindowTitle)] == previousLogItem

但这不起作用，因为类型仍然不同：

Couldn't match type ‘Data.Text.Internal.Lazy.Text’
                 with ‘Text’
  NB: ‘Text’ is defined in ‘Data.Text.Internal’
      ‘Data.Text.Internal.Lazy.Text’
        is defined in ‘Data.Text.Internal.Lazy’
    arising from a functional dependency between:
      constraint ‘Database.Esqueleto.Internal.Sql.SqlSelect
                    (SqlExpr (Value Text)) (Value Data.Text.Internal.Lazy.Text)’
        arising from a use of ‘select’
      instance ‘Database.Esqueleto.Internal.Sql.SqlSelect
                  (SqlExpr (Value a)) (Value a)’

Answer 1

Couldn't match type ‘Data.Text.Internal.Lazy.Text’
                with ‘Text’
  NB: ‘Text’ is defined in ‘Data.Text.Internal’
    ‘Data.Text.Internal.Lazy.Text’

您使用了错误的Text. 检查你的进口。

Answer 2

编辑：我误读了原始问题

您是否尝试过fromString在IsString课堂上使用？Data.Text.Internal.Lazy.Text应该是一个实例IsString

旧（无用）答案：

使用pack函数 fromData.Text.Lazy将 to 转换String为Text

https://hackage.haskell.org/package/text-1.2.3.0/docs/Data-Text-Lazy.html