schemaless-changesets.example.ex

defmodule MyApp.Accounts do
  # (...)
  
  def sign_up(%{} = params) do
    params_schema = %{
      name: :string,
      email: :string,
      phone: :string,
      password: :string
    }

    changeset =
      {%{}, params_schema}
      |> cast(params, Map.keys(params_schema))
      |> validate_required([:name, :email, :password])
      |> validate_length(:password, min: 24)
      |> validate_confirmation(:password, required: true)

    with {:ok, params} <- apply_action(changeset, :sign_up),
          {:ok, pw_hash} <- some_password_magic_goes_here(params.password),
          {:ok, user} <- User.create(params |> Map.put(:password_hash, pw_hash)) do
      {:ok, user}
    end
  end
  
  # ...
end