resource :users do
  params do
    requires :email_address, allow_blank: false
    requires :password, allow_blank: false
  end
  post do
    User.create!(email: params[:email_address], password: params[:password])
  end
end

resource :users do
  params do
    requires :email, allow_blank: false, as: :email_address
    requires :password, allow_blank: false
  end
  post do
    User.create!(params)
  end
end