oneshot

lib/rsh26pool/voting/vote.ex

@@ -0,0 +1,29 @@
+defmodule Rsh26pool.Voting.Vote do
+  @moduledoc """
+  A single vote cast by a participant for an idea. A participant may vote for a
+  given idea at most once (enforced by a unique index).
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  alias Rsh26pool.Voting.{Idea, Participant}
+
+  schema "votes" do
+    belongs_to :idea, Idea
+    belongs_to :participant, Participant
+
+    timestamps(type: :utc_datetime)
+  end
+
+  def changeset(vote, attrs) do
+    vote
+    |> cast(attrs, [:idea_id, :participant_id])
+    |> validate_required([:idea_id, :participant_id])
+    |> unique_constraint([:idea_id, :participant_id],
+      name: :votes_idea_id_participant_id_index,
+      message: "は既に投票済みです"
+    )
+    |> foreign_key_constraint(:idea_id)
+    |> foreign_key_constraint(:participant_id)
+  end
+end