数据构造函数不在范围内：无法识别的杂注

Question

经过网站第一个项目后，我想添加一些静态页面，我检查了以下IHP - Recipes静态页面。我就是这样进行的：

在web/Types.hs中我添加了以下内容：

data StaticController      
  = WelcomeAction        
  | AboutAction          
  deriving (Eq, Show, Data)

在Web/Static/About.hs：

module Web.View.Static.About where
import Web.View.Prelude 

data About = About

instance View About where
   html About = [hsx| ~some html here~ |]

在Web/Controller/Static.hs

module Web.Controller.Static where
import Web.Controller.Prelude
import Web.View.Static.Welcome
import Web.View.Static.About

instance Controller StaticController where
    action WelcomeAction = render WelcomeView
    action AboutAction   = render AboutView
                                       `

我得到的错误是：

Web/Controller/Static.hs:8:35
Data constructor not in scope: AboutView
|
|     action AboutAction   = render AboutView
|

build/Generated/Types.hs:3:1
Unrecognised pragma
|
| {-# GHC_OPTIONS -Wno-unused-imports, -Wno-dodgy-imports, -Wno-unused-matches #-}module    Generated.Types where
| ^^^

Answer 1

您在名为 About 的数据类型中定义了视图。所以要渲染它，你会调用 render About，而不是 render AboutView.

我建议将 About 重命名为 AboutView，这更符合 IHP 惯例:)

数据构造函数不在范围内：无法识别的杂注

Data constructor not in scope: Unrecognised pragma

ihp