Haskell Cookbook

How to do it...

1. Create a new project called managing-migrations with the simple stack template:

        stack new managing-migrations simple

2. Add dependencies on the persistent, persistent-template, persistent-sqlite, text, and mtl libraries in the build-depends sub-section of the executable section:

        executable manage-migrations
          hs-source-dirs:      src
          main-is:             Main.hs
          default-language:    Haskell2010
          build-depends:       base >= 4.7 && < 5
                             , persistent
                             , persistent-template
                             , persistent-sqlite
                             , text
                             , mtl

3. Open src/Main.hs. We will be adding our source here.

4. Add the extensions required for invoking Persistent and persistent-template functions:

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