Haskell Cookbook

How to do it...

1. Create a new project called working-with-persistent with the simple stack template:

        stack new working-with-persistent simple

2. Add a dependency to persistent and persistent-sqlite, in the build-depends subsection of the executable section. Also add persistent-template, text, 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

3. Open src/Main.hs. We will be adding our source here.
4. At the top, we need to enable many extensions that are required for the persistent backend:

 {-# LANGUAGE EmptyDataDecls #-} {-# LANGUAGE FlexibleContexts ...