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Haskell Cookbook by Yogesh Sajanikar

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How to do it...

  1. Create a new project called working-with-persistent with the simple stack template:
        stack new working-with-persistent simple
  1. Add a dependency to persistent and persistent-sqlite, in the build-depends subsection of the executable section. Also add persistent-templatetext, and mtl (monad transformers) in the same section:
        executable working-with-persistent
          hs-source-dirs:      src
          main-is:             Main.hs
          default-language:    Haskell2010
          build-depends:       base >= 4.7 && < 5
                              , persistent
                              , persistent-sqlite
                              , persistent-template
                              , text
                              , mtl
  1. Open src/Main.hs. We will be adding our source here.
  2. At the top, we need to enable many extensions that are required for the persistent backend:
 {-# LANGUAGE EmptyDataDecls #-} {-# LANGUAGE FlexibleContexts ...

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