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Hey! Hey! Can u rel8?
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Shane O'Brien d63063940d
Simplify eval to run directly inside the Query monad 
@tomjaguarpaw at ZuriHac questioned whether the `Evaluation` monad was really unnecessary.

And yes, it turns out that the `Evaluation` monad wasn't actually really adding any value. The real issue was Postgres's unspecified evaluation order (which in practice behaved like the broken `ListT` from transformers).

We now maintain a stack of bindings from previous subselects in the `Query` monad, which future queries can reference. So for `evalulation`, to ensure that Postgres doesn't try to run a function once where we expect it to be run multiple times, we modify the expression to contain a bunch of superfluous lateral references to the previous queries. This ensures that it gets run every time.
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src Simplify eval to run directly inside the Query monad 2021-06-22 11:50:34 +01:00
tests Simplify eval to run directly inside the Query monad 2021-06-22 11:50:34 +01:00
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README.md

Welcome!

Welcome to Rel8! Rel8 is a Haskell library for interacting with PostgreSQL databases, built on top of the fantastic Opaleye library.

The main objectives of Rel8 are:

  • Conciseness: Users using Rel8 should not need to write boiler-plate code. By using expressive types, we can provide sufficient information for the compiler to infer code whenever possible.

  • Inferrable: Despite using a lot of type level magic, Rel8 aims to have excellent and predictable type inference.

  • Familiar: writing Rel8 queries should feel like normal Haskell programming.

For more details, check out the official documentation.