Lazy Float

example_usage.ex

thing_1 = Project.Thing.create( %{ value: 3 } )

thing_2 = Project.Thing.create( %{ value: "3.2" } )

thing_3 = Project.Thing.create( %{ value: 3.2 } )

lazy_float_type.ex

defmodule Project.LazyFloat do

  def type, do: :float

  def cast(string) when is_binary(string) do
    case Float.parse(string) do
      {float, _} -> {:ok, float}
      :error   -> :error
    end
  end

  def cast(integer) when is_integer(integer) do
    case Float.parse(to_string(integer)) do
      {float, _} -> {:ok, float}
      :error   -> :error
    end
  end

  def cast(_), do: :error
  def blank?(_), do: false
  
  def load(float) when is_float(float), do: {:ok, float}
  
  def dump(float) when is_float(float), do: {:ok, float}
  def dump(_), do: :error
end

thing_model.ex

defmodule Project.Thing do
  use Project.Model

  schema "things" do
    field :value, Project.LazyFloat
  end
end