Multi posts per pages

I'm making a website with Hakyll and I would like to gather some posts in the same page. I find somes example on websites such as dannysu or EAnalytica, but my code is not working and I don't understand why.

My code compile fine, the trace function show that all the posts are loaded, the compilation is successfull but all the webpages supposed to contain 3 posts are empty. Only the text before the loop and the links to the next and previous pages are visible.

My Hakyll code is the following.

toolsPages = do
  pag <- buildPaginateWith grouper "tools/*" makeId
  paginateRules pag $ \pageNum pattern -> trace (show pag) $ do
      route idRoute
      compile $ do
          posts <- recentFirst =<< loadAll pattern
          let paginateCtx = paginateContext pag pageNum
              ctx =
                  constField "title" ("Tools - Page " ++ (show pageNum)) <>
                  listField "tools" (postCtx) (return posts) <>
                  paginateCtx <>
                  defaultContext
          makeItem ""
              >>= loadAndApplyTemplate "templates/outils-pag.html" ctx
              >>= relativizeUrls

grouper ids = (liftM (paginateEvery 3) . sortRecentFirst) ids

makeId pageNum = fromFilePath $ "blog/page/" ++ (show pageNum) ++ "/index.html"

postCtx :: Context String
postCtx =
  dateField "date" "%d / %m / %Y"
  `mappend` bodyField "body"
  `mappend` defaultContext

The templates/outils-pag.html template contains the following.

some text before the loop
$for(tool)$
some text inside the loop
$date$
$teaser$
$body$
$endfor$

$if(previousPageNum)$
<a href="$previousPageUrl$">previous</a>
$else$
$endif$
&mdash;
$currentPageNum$ of $numPages$
&mdash;
$if(nextPageNum)$
<a href="$nextPageUrl$">next</a>
$else$
$endif$

Do you have an idea of what is wrong with my code?
Do you know another example of pagination with Hakyll?

This basic compile rule must be run before pagination :

tools = do
  match "tools/*" $ do
    route $ setExtension "html"
    compile $ compiler
      >>= loadAndApplyTemplate "templates/tools.html"    postCtx
      >>= relativizeUrls

And then, it Work!