Extruder

def deps do
  [{:extruder, "~> 0.0.1"}]
end

defmodule TestModel do
  use Extruder

  defmodel do
    field :foo, :int
    field :bar, :int, default: 1
    field :bool_def, :boolean
    field :def_str, :string
    field :text, :string, default: "foo bar wadus"
    field :list_def, :list
    field :map_def, :map, default: %{foo: []}
    field :some_atom, :atom
    field :neested_struct, :struct, module: MyApp.NeestedStruct
    field :neested_struct_list, :structs_list, module: MyApp.NeestedStruct
    field :date, :datetime

    validates_presence_of :foo
  end
end

iex> TestModel.extrude %{"foo" => 1}
{:ok,
 %TestModel{bar: 1, bool_def: false, def_str: nil, foo: 1, list_def: [],
  map_def: %{foo: []}, neested_struct: nil, neested_struct_list: nil,
  some_atom: nil, text: "foo bar wadus"}}

iex> TestModel.extrude %{"bar" => 2}
{:error,
 %TestModel{bar: 2, bool_def: false, def_str: nil, foo: nil, list_def: [],
  map_def: %{foo: []}, neested_struct: nil, neested_struct_list: nil,
  some_atom: nil, text: "foo bar wadus"}, [foo: [:can_not_be_nil]]}