Run db action in yesod test - haskell

Question

In my yesod test I want to be able to modify a record in the db in the middle of the test.
Here is the code I came up with
yit "post is created by authorized user" $ do
request $ do
addPostParam "ident" "dummy"
setMethod "POST"
setUrl ("http://localhost:3000/auth/page/dummy" :: Text)
update 0 [UserAuthorized =. True]
postBody PostR (encode $ object [
"body" .= ("test post" :: Text),
"title" .= ("test post" :: Text),
"coverImage" .= ("test post" :: Text),
"author" .= (0 :: Int)
])
statusIs 200
This fails with the error
• Couldn't match expected type ‘IO a0’
with actual type ‘ReaderT backend0 m0 ()’
• In the second argument of ‘($)’, namely
‘update 0 [UserAuthorized =. True]’
In a stmt of a 'do' block:
runIO $ update 0 [UserAuthorized =. True]
In the expression:
do { settings <- runIO
$ loadYamlSettings
["config/test-settings.yml", "config/settings.yml"] [] useEnv;
foundation <- runIO $ makeFoundation settings;
yesodSpec foundation $ do { ydescribe "Auth" $ do { ... } };
runIO $ update 0 [UserAuthorized =. True];
.... }
I can tell this is because update returns m () instead of YesodExample site () like request, postBody and statusIs do.
How would I be able to do a db update inside of this test?

Answer 1

You need to use runDB function. i.e:
runDB $ update 0 [UserAuthorized =. True]

Answer 2

There were 2 problems in this, the first one as Sibi pointed out is I needed runDB the second one is you can't just look up a record with an integer.
To get this working I used the following code
runDB $ do
(first :: Maybe (Entity User)) <- selectFirst [] []
case first of
Nothing -> pure () -- handle the case when the table is empty
Just (Entity k _) -> update k [UserAuthorized =. True]
This find's the record in the DB and then updates it. Modify (first :: Maybe (Entity User)) <- selectFirst [] [] to select the record you want to update.