# defmodule UserExt do
#   defstruct [:first_name]
# end

# defmodule User do
#   use Parameter.Schema
#   alias Parameter.Validators

#   param do
#     field :first_name, :string, key: "firstName", required: true
#     field :last_name, :string, key: "lastName"
#     field :email, :string, validator: &Validators.email(&1)
#   end
# end