# EctoPostgresEnum
Ecto helper library to use PostgreSQL enums
## Installation
The package can be installed by adding `ecto_postgres_enum` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
{:ecto_postgres_enum, "~> 1.0"}
]
end
```
## Usage
Te define enum simply use `EctoPostgresEnum` module like:
```elixir
defmodule MyEnum do
use EctoPostgresEnum, type: :my_enum, values: [:my, :enum]
# optionally add schema:
# use EctoPostgresEnum, schema: :non_public, type: :my_enum, values: [:my, :enum]
end
```
and then add it to your schema like:
```elixir
defmodule MySchema do
use Ecto.Schema
alias Ecto.Changeset
schema "my_table" do
field(:my_field, MyEnum)
end
def changeset(my_element, my_params) do
Changeset.cast(my_element, my_params, [:my_field])
end
end
```
Finally you will also need to create migration like:
```elixir
defmodule Example.Repo.Migrations.MyEnum do
use Ecto.Migration
def up do
MyEnum.create_db_enum
alter table(:my_table) do
add :my_field, :my_enum
end
end
def down do
alter table(:my_table) do
remove :my_field
end
MyEnum.drop_db_enum
end
end
```