database-id-class: Class for types with a database id

Class for types with a database id

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Versions [RSS]	0.1.0.0, 0.1.0.1
Change log	CHANGELOG.md
Dependencies	aeson, base (>=4.11 && <4.14) [details]
License	BSD-3-Clause
Copyright	2019 Obsidian Systems LLC
Author	Obsidian Systems LLC
Maintainer	maintainer@obsidian.systems
Category	Database
Uploaded	by abrar at 2019-07-21T07:34:11Z
Distributions	NixOS:0.1.0.1
Reverse Dependencies	1 direct, 0 indirect [details]
Downloads	1076 total (4 in the last 30 days)
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Status	Docs uploaded by user Build status unknown [no reports yet]

This package defines a (parametric) data type Id a used to refer to the primary key of values of type a in a database.

newtype Id a = Id { unId :: IdData a }

Here, IdData is a type family associated with the HasId class:

class HasId a where
  type IdData a :: *
  type IdData a = Int64

It defaults to Int64 because that tends to be the type you want for tables with an autoincrement primary key.