After "mix phx.gen.json BiddingRounds BiddingRound bidding_rounds round_number:integer running:boolean --no-scope".

lib/beet_round_server_web/controllers/bidding_round_json.ex

@@ -0,0 +1,25 @@
+defmodule BeetRoundServerWeb.BiddingRoundJSON do
+  alias BeetRoundServer.BiddingRounds.BiddingRound
+
+  @doc """
+  Renders a list of bidding_rounds.
+  """
+  def index(%{bidding_rounds: bidding_rounds}) do
+    %{data: for(bidding_round <- bidding_rounds, do: data(bidding_round))}
+  end
+
+  @doc """
+  Renders a single bidding_round.
+  """
+  def show(%{bidding_round: bidding_round}) do
+    %{data: data(bidding_round)}
+  end
+
+  defp data(%BiddingRound{} = bidding_round) do
+    %{
+      id: bidding_round.id,
+      round_number: bidding_round.round_number,
+      running: bidding_round.running
+    }
+  end
+end