defmodule Auction do
  use Ecto.Schema
  import Ecto.Changeset

  schema "auctions" do
    field :gid, :string, primary_key: true
    field :author_gid, :string
    field :starting_price, :decimal
  end

  def changeset(auction, params \\ %{}) do
    auction
    |> cast(params, [:gid, :author_gid, :starting_price])
    |> validate_required([:gid, :author_gid, :starting_price])
    |> validate_number(:starting_price, greater_than_or_equal_to: 0)
    |> unique_constraint([:gid])
  end
end