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Herminio Torres
Herminio Torres

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Taming data with Ecto.Enum and Ecto.Type

#elixir #ecto #phoenix #tutorial

Let's take advantage of Ecto.Enum and Ecto.Type.

The schema:

defmodule Blog.Category do use Blog.Schema schema "categories" do field(:name, Ecto.Enum, [:til, :elixir, :ecto]) end end
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Divide & Conquer with Reflections and Ecto.Type.load/3:

iex> type = Blog.Category.__schema__(:type, :name) {:parameterized, Ecto.Enum, %{ mappings: [til: "til", elixir: "elixir", ecto: "ecto"], on_cast: %{"til" => :til, "elixir" => :elixir, "ecto" => :ecto}, on_dump: %{til: "til", elixir: "elixir", ecto: "ecto"}, on_load: %{"til" => :til, "elixir" => :elixir, "ecto" => :ecto}, type: :string }} iex> Ecto.Type.load(type, "unknown") :error iex> Ecto.Type.load(type, "ecto") {:ok, :ecto} iex> Ecto.Type.load(type, :ecto) :error
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In the meantime:

iex> Ecto.Enum.values(Blog.Category, :name) [:til, :elixir, :ecto] iex> Ecto.Enum.dump_values(Blog.Category, :name) ["til", "elixir", "ecto"] iex> Ecto.Enum.mappings(Blog.Category, :name) [til: "til", elixir: "elixir", ecto: "ecto"]
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Also, another great resource from German Velasco where he wrote Richer domain types with Ecto custom types

Happy Hacking!

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