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The application of `just` is unnecessary, and actually leads to a type error.
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Steven Leiva 2019-04-06 10:50:01 -05:00 committed by GitHub
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@ -158,7 +158,7 @@ However, you may want your results to include people who don't have any blog pos
```haskell
select $
from $ \(p `LeftOuterJoin`` mb) -> do
on (just (p ^. PersonId) ==. mb ?. BlogPostAuthorId)
on (p ^. PersonId ==. mb ?. BlogPostAuthorId)
orderBy [asc (p ^. PersonName), asc (mb ?. BlogPostTitle)]
return (p, mb)
```