Sensors detective

I have an Asus M5A97 PRO motherboard, which includes the common set of sensors. The lm-sensors free software correctly detects two chips, k10temp-pci-00c3 and it8721-isa-0290, corresponding to my Phenom II and my motherboard, respectively. However, by default the output of sensors looks like:

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Posted in Hacking | Tagged , , , , | 3 Comments

Esqueleto now supports IN and EXISTS

Since version 0.2.9 that I’ve just released, esqueleto supports IN and EXISTS operators (and their negated counterparts). For example:

select $
from $ \person -> do
where_ $ exists $
         from $ \post -> do
         where_ (post ^. BlogPostAuthorId ==. person ^. PersonId)
return person

Enjoy! =)

PS: I’ll try to post more in the future, so keep tuned =).

Posted in Haskell | 3 Comments

Announcing esqueleto, a type-safe EDSL for SQL queries

I’m very pleased to announce a preview release of esqueleto, a bare bones, type-safe EDSL for SQL queries.

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Posted in Haskell | Tagged , , , , , , | 5 Comments

Abstracting permissions with Yesod

Yesod is a terrific framework for web applications in Haskell.  It has many, many built-in features.  One of them is that there’s nice support for authentication and authorization.  In this post I’m interested in talking about how you could write your authorization code such that it’s harder to make mistakes.

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