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Isn

Isn adds a Postgrex.Extension and Ecto.Type definitions for the datatypes defined in the isn PostgreSQL module.

Usage

Add the package to your Mixfile:
```
defp deps do
[{:isn, "~> 0.1"}]
end
```

Add the isn extension to your database

{:ok, pid} = Postgrex.Connection.start_link(
hostname: "localhost",
database: "isn_test"
)
Postgrex.Connection.query!(pid, "CREATE EXTENSION isn;", [])

Postgrex.Connection.start_link(
database: "isn_test",
extensions: [{Isn, {}}])

Start using all of the isn goodness in your project.

Examples

Here are a few small snippets for how to use these types in various contexts. I have extracted these snippets from a phoenix project, so if you want to use them in something else, you might have to modify them a bit.

Ecto migrations

defmodule MyApp.Repo.Migrations.CreateBook do
  use Ecto.Migration

  def change do
    create table(:books) do
      add :isbn, :isbn13
      # other fields
    end
  end
end

Ecto Models

defmodule MyApp.Book do
  use MyApp.Web, :model

  schema "books" do
    field :isbn, Isn.ISBN13
    # other fields
  end
end

Defined types

Isn adds the following ecto and corresponding postgrex types:

Ecto.Type	Postgrex type
`Isn.ISBN`	`:isbn`
`Isn.ISBN13`	`:isbn13`
`Isn.ISMN`	`:ismn`
`Isn.ISMN13`	`:ismn13`
`Isn.ISSN`	`:issn`
`Isn.ISSN13`	`:issn13`
`Isn.EAN13`	`:ean13`
`Isn.UPC`	`:upc`

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