Update the link api.

lib/link_shortener_web/controllers/api/v1/link_controller.ex

@@ -0,0 +1,43 @@
+defmodule LinkShortenerWeb.Api.V1.LinkController do
+  use LinkShortenerWeb, :controller
+
+  alias LinkShortener.Links
+  alias LinkShortener.Links.Link
+
+  action_fallback LinkShortenerWeb.FallbackController
+
+  def index(conn, _params) do
+    links = Links.get_all()
+    render(conn, :index, links: links)
+  end
+
+  def create(conn, %{"link" => link_params}) do
+    with {:ok, %Link{} = link} <- Links.insert_one(link_params) do
+      conn
+      |> put_status(:created)
+      |> put_resp_header("location", ~p"/api/v1/items/")
+      |> render(:show, link: link)
+    end
+  end
+
+  def show(conn, %{"id" => id}) do
+    link = Links.get_one!(id)
+    render(conn, :show, link: link)
+  end
+
+  def update(conn, %{"id" => id, "link" => link_params}) do
+    link = Links.get_one!(id)
+
+    with {:ok, %Link{} = link} <- Links.update_one(link, link_params) do
+      render(conn, :show, link: link)
+    end
+  end
+
+  def delete(conn, %{"id" => id}) do
+    link = Links.get_one!(id)
+
+    with {:ok, %Link{}} <- Links.delete_one(link) do
+      send_resp(conn, :no_content, "")
+    end
+  end
+end

lib/link_shortener_web/controllers/api/v1/link_json.ex

@@ -0,0 +1,20 @@
+defmodule LinkShortenerWeb.Api.V1.LinkJSON do
+  alias LinkShortener.Links.Link
+
+  def index(%{links: links}) do
+    %{data: for(link <- links, do: link(link))}
+  end
+
+  def show(%{link: link}) do
+    %{data: link(link)}
+  end
+
+  def link(%Link{} = link) do
+    %{
+      id: link.id,
+      name: link.name,
+      url: link.url,
+      shorten: link.shorten
+    }
+  end
+end

lib/link_shortener_web/controllers/changeset_json.ex

@@ -0,0 +1,25 @@
+defmodule LinkShortenerWeb.ChangesetJSON do
+  @doc """
+  Renders changeset errors.
+  """
+  def error(%{changeset: changeset}) do
+    # When encoded, the changeset returns its errors
+    # as a JSON object. So we just pass it forward.
+    %{errors: Ecto.Changeset.traverse_errors(changeset, &translate_error/1)}
+  end
+
+  defp translate_error({msg, opts}) do
+    # You can make use of gettext to translate error messages by
+    # uncommenting and adjusting the following code:
+
+    # if count = opts[:count] do
+    #   Gettext.dngettext(LinkShortenerWeb.Gettext, "errors", msg, msg, count, opts)
+    # else
+    #   Gettext.dgettext(LinkShortenerWeb.Gettext, "errors", msg, opts)
+    # end
+
+    Enum.reduce(opts, msg, fn {key, value}, acc ->
+      String.replace(acc, "%{#{key}}", fn _ -> to_string(value) end)
+    end)
+  end
+end

lib/link_shortener_web/controllers/fallback_controller.ex

@@ -0,0 +1,24 @@
+defmodule LinkShortenerWeb.FallbackController do
+  @moduledoc """
+  Translates controller action results into valid `Plug.Conn` responses.
+
+  See `Phoenix.Controller.action_fallback/1` for more details.
+  """
+  use LinkShortenerWeb, :controller
+
+  # This clause handles errors returned by Ecto's insert/update/delete.
+  def call(conn, {:error, %Ecto.Changeset{} = changeset}) do
+    conn
+    |> put_status(:unprocessable_entity)
+    |> put_view(json: LinkShortenerWeb.ChangesetJSON)
+    |> render(:error, changeset: changeset)
+  end
+
+  # This clause is an example of how to handle resources that cannot be found.
+  def call(conn, {:error, :not_found}) do
+    conn
+    |> put_status(:not_found)
+    |> put_view(html: LinkShortenerWeb.ErrorHTML, json: LinkShortenerWeb.ErrorJSON)
+    |> render(:"404")
+  end
+end