CODEWITHSUNDEEP
sqlhaskellyesodhaskell-persistent
Alebon
Alebon

Reputation: 1187

Haskell Persistent query on dates (Yesod)

I am trying to add date parts into an URL for a blog post, lets say

/blog/2016/11/23/my-blog-post-slug

I want to check not only for the slug but the date parts as well. This is what I got so far:

getBlogPostR :: Int -> Int -> Int -> Slug -> Handler Html
getBlogPostR pathYear pathMonth pathDay pathSlug = do
  Entity _ BlogPost {..} <- runDB $ getBy404 $ UniqueBlogPostSlug pathSlug
  let (year, month, day) = toGregorian $ utctDay blogPostCreatedAt
  if (fromIntegral year /= pathYear && month /= pathMonth && day /= pathDay)
    then notFound
    else
      defaultLayout $ do
        setTitleI blogPostTitle
        $(widgetFile "blog/post")

Seems to be a bit clunky. Is there a way to add this year, month, day parts as query filtering params? (I know I could execute a raw query, but this is not what I am looking for)

[Additional Info]

My models are defined as follows:

BlogPost
  uuid Text
  title Text
  slug Text
  markdownContent Text
  createdAt UTCTime
  UniqueBlogPostUuid uuid
  UniqueBlogPostSlug slug
  Primary uuid

Upvotes: 4

Views: 367

Answers (1)

MCH
MCH

Reputation: 2214

getBlogPostR :: Slug -> Handler Html
getBlogPostR pathSlug = do
  Entity _ BlogPost {..} <- runDB $ getBy404 $ UniqueBlogPostSlug pathSlug
  mYear <- lookupGetParam "year"
  mMonth <- lookupGetParam "month"
  mDay <- lookupGetParam "day"
  case (,,) <$> mYear <*> mMonth <*> mDay of
    Just (queryYear, queryMonth, queryDay) -> do 
      let (year, month, day) = toGregorian $ utctDay blogPostCreatedAt
      if (fromIntegral year /= queryYear && month /= queryMonth && day /= queryDay)
        then notFound
        else
          defaultLayout $ do
            setTitleI blogPostTitle
            $(widgetFile "blog/post")
    Nothing -> notFound

Upvotes: 0

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