Change models, new migrations, fix front and make tests work

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/eventos_web/views/track_view.ex

@@ -0,0 +1,19 @@
+defmodule EventosWeb.TrackView do
+  use EventosWeb, :view
+  alias EventosWeb.TrackView
+
+  def render("index.json", %{tracks: tracks}) do
+    %{data: render_many(tracks, TrackView, "track.json")}
+  end
+
+  def render("show.json", %{track: track}) do
+    %{data: render_one(track, TrackView, "track.json")}
+  end
+
+  def render("track.json", %{track: track}) do
+    %{id: track.id,
+      name: track.name,
+      description: track.description,
+      color: track.color}
+  end
+end