@spec cast(:string, :integer, value :: String.t()) :: integer()

@spec cast(:string, :float, value :: String.t()) :: float()

@spec cast(:integer, :string, value :: integer()) :: String.t()

Casts a string into an integer

Casting a string into an integer

iex> defmodule UserContract do
...>   use Drops.Contract
...>
...>   schema do
...>     %{required(:age) => cast(:string) |> type(:integer)}
...>   end
...> end
iex> UserContract.conform(%{age: "20"})
{:ok, %{age: 20}}

Casting a string into a float

iex> defmodule UserContract do
...>   use Drops.Contract
...>
...>   schema do
...>     %{required(:num) => cast(:string) |> type(:float)}
...>   end
...> end
iex> UserContract.conform(%{num: "20.5"})
{:ok, %{num: 20.5}}

Casting an integer into a string

iex> defmodule UserContract do
...>   use Drops.Contract
...>
...>   schema do
...>     %{required(:id) => cast(:integer) |> type(:string)}
...>   end
...> end
iex> UserContract.conform(%{id: 312})
{:ok, %{id: "312"}}

Casting an integer into a date time

iex> defmodule UserContract do
...>   use Drops.Contract
...>
...>   schema do
...>     %{required(:date) => cast(:integer) |> type(:date_time)}
...>   end
...> end
iex> UserContract.conform(%{date: 1614556800})
{:ok, %{date: ~U[2021-03-01 00:00:00Z]}}