haskell – 如何在帖子上生成最近帖子列表时避免依赖循环？

create ["archive.html"] $do
    route idRoute
    compile $do
        posts <- (myRecentFirst gitTimes) =<< loadAll "posts/**"
        let archiveCtx =
                listField "posts" (postCtx allTags allCategories gitTimes) (return posts) `mappend`
                constField "title" "Archives"            `mappend`
                (postCtx allTags allCategories gitTimes)

        makeItem ""
            >>= loadAndApplyTemplate "templates/archive.html" archiveCtx
            >>= loadAndApplyTemplate "templates/default.html" archiveCtx
            >>= relativizeUrls

在archive.html中创建最近的帖子列表;这是沼泽标准,它来自我认为的其中一个教程.除了postsCtx,这有点复杂,但在这里不应该相关.

但是,我想在正常帖子的侧边栏中列出一些最近的帖子.问题在于最近的帖子最终取决于他们自己.我试着从自己生成的列表中排除帖子本身,但我找不到一个好的地方去做.这是我到目前为止所得到的：

match "posts/**" $do
    route $(gsubRoute "posts/" (const "")) `composeRoutes` setExtension "html"
    compile $do
        recents <- (myRecentFirst gitTimes) =<< loadAll "posts/**"
        let postsContext = postCtx allTags allCategories gitTimes `mappend`
                           -- Show recent posts
                           recentsNotSelfField "recents" (postCtx allTags allCategories gitTimes) (return $take 3 recents)

        pandocCompilerWithTransform hblogPandocReaderOptions hblogPandocWriterOptions (titleFixer titles)
            >>= loadAndApplyTemplate "templates/post.html"    postsContext
            >>= loadAndApplyTemplate "templates/default.html" postsContext
            >>= relativizeUrls

recentsNotSelfField :: String -> Context a -> Compiler [Item a] -> Context b
recentsNotSelfField key context items = Context $k _ i ->·
    if k == key then do
        let myId = itemIdentifier i
        strippedItems <- items
        let remains = filter (x -> (itemIdentifier x) /= myId) strippedItems
        return $ListField context remains
    else
        CA.empty

recentsNotSelfField应该生成一个除了本身以外的所有最近的字段,但它似乎没有工作或者它是错误的地方,因为：

Initialising...
  Creating store...
  Creating provider...
  Running rules...
Checking for out-of-date items
Compiling
  [ERROR] Hakyll.Core.Runtime.chase: Dependency cycle detected: posts/computing/contact.md depends on posts/computing/contact.md

到目前为止,我被困住了.

编辑：

我看到Hakyll says “Dependency cycle detected: …”,这是loadPosts做的,所以我尝试了这个：

match "posts/**" $do
    route $(gsubRoute "posts/" (const "")) `composeRoutes` setExtension "html"
    compile $do
        myId <- getUnderlying
        recents <- (myRecentFirst gitTimes) =<< loadAll ("posts/**" .&&. complement (fromList [myId]))
        let postsContext = postCtx allTags allCategories gitTimes `mappend`
                           -- Show recent posts
                           listField "recents" (postCtx allTags allCategories gitTimes) (return $take 3 recents)

        pandocCompilerWithTransform hblogPandocReaderOptions hblogPandocWriterOptions (titleFixer titles)
            >>= loadAndApplyTemplate "templates/post.html"    postsContext
            >>= loadAndApplyTemplate "templates/default.html" postsContext
            >>= relativizeUrls

但这只是让我：

[ERROR] Hakyll.Core.Runtime.chase: Dependency cycle detected: posts/computing/contact.md depends on posts/computing/general/ched.md depends on posts/computing/contact.md

换句话说,最终我最近两次骑自行车.