Add the API to show the Links model or models.

lib/link_shortener_web/views/api/v1/links_view.ex

@@ -0,0 +1,21 @@
+defmodule LinkShortenerWeb.Api.V1.LinksView do
+  use LinkShortenerWeb, :view
+  alias LinkShortenerWeb.Api.V1.LinksView
+
+  def render("index.json", %{links: links}) do
+    %{data: render_many(links, LinksView, "link.json")}
+  end
+
+  def render("show.json", %{links: link}) do
+    %{data: render_one(link, LinksView, "link.json")}
+  end
+
+  def render("link.json", %{links: link}) do
+    %{
+      id: link.id,
+      name: link.name,
+      url: link.url,
+      shorten: link.shorten
+    }
+  end
+end

lib/link_shortener_web/views/changeset_view.ex

@@ -0,0 +1,19 @@
+defmodule LinkShortenerWeb.ChangesetView do
+  use LinkShortenerWeb, :view
+
+  @doc """
+  Traverses and translates changeset errors.
+
+  See `Ecto.Changeset.traverse_errors/2` and
+  `LinkShortenerWeb.ErrorHelpers.translate_error/1` for more details.
+  """
+  def translate_errors(changeset) do
+    Ecto.Changeset.traverse_errors(changeset, &translate_error/1)
+  end
+
+  def render("error.json", %{changeset: changeset}) do
+    # When encoded, the changeset returns its errors
+    # as a JSON object. So we just pass it forward.
+    %{errors: translate_errors(changeset)}
+  end
+end