StorageKey
A StorageKey represents a value that is either New or Existing.
Lets take for example an Article. It will have a unique Id, and the article record itself. How would we distinguish between an existing
Article (one that was fetched from the backend) vs a new one, while still having type safety?
Here is how this package helps along with this pattern.
-- http://package.elm-lang.org/packages/Gizra/elm-dictlist/latest
-- It's like EveryDict, only it will maintain the order as-well.
import EveryDictList
type alias Article =
{ label : String
, body : String
}
{-| The Article ID is type safe.
-}
type ArticleId
= ArticleId Int
{-| We wrap the `ArticleId` with the `StorageKey`.
-}
type alias StorageKeyArticle =
StorageKey ArticleId
type alias EveryDictListArticles =
EveryDictList StorageKeyArticle Article
type alias Person =
{ name : String
, articles : EveryDictListArticles
}Installation
elm-package install Gizra/elm-storage-key
Tests
Install package: npm install -g elm-test
Execute tests: ./execute-tests
