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

lib/link_shortener_web/router.ex

@@ -20,10 +20,13 @@ defmodule LinkShortenerWeb.Router do
     get "/", PageController, :home
   end
 
-  # Other scopes may use custom stacks.
-  # scope "/api", LinkShortenerWeb do
-  #   pipe_through :api
-  # end
+  scope "/api", LinkShortenerWeb do
+    pipe_through :api
+
+    scope "/v1", Api.V1, as: :v1 do
+      resources "/links", LinkController
+    end
+  end
 
   # Enable LiveDashboard and Swoosh mailbox preview in development
   if Application.compile_env(:link_shortener, :dev_routes) do

test/link_shortener_web/controllers/api/v1/link_controller_test.exs

@@ -0,0 +1,100 @@
+defmodule LinkShortenerWeb.Api.V1.LinkControllerTest do
+  use LinkShortenerWeb.ConnCase
+
+  import LinkShortener.LinksFixtures
+
+  alias LinkShortener.Links.Link
+  alias LinkShortener.Links
+
+  @create_attrs %{
+    name: "some link name",
+    url: "https://gitlab.com/KKlochko/link_shortener",
+    shorten: "git_repo",
+  }
+
+  @update_attrs %{
+    name: "some updated link name",
+    url: "https://gitlab.com/KKlochko/link_shortener2",
+    shorten: "new_git_repo",
+  }
+
+  @invalid_attrs %{
+    name: nil,
+    url: nil,
+    shorten: nil,
+  }
+
+  setup %{conn: conn} do
+    {:ok, conn: put_req_header(conn, "accept", "application/json")}
+  end
+
+  describe "index" do
+    test "lists all links", %{conn: conn} do
+      conn = get(conn, ~p"/api/v1/links")
+      assert json_response(conn, 200)["data"] == []
+    end
+  end
+
+  describe "create link" do
+    test "renders link when data is valid", %{conn: conn} do
+      conn = post(conn, ~p"/api/v1/links", link: @create_attrs)
+      assert %{"id" => id} = json_response(conn, 201)["data"]
+
+      conn = get(conn, ~p"/api/v1/links/#{id}")
+
+      assert %{
+               "id" => ^id,
+	       "name" => "some link name",
+	       "url" => "https://gitlab.com/KKlochko/link_shortener",
+	       "shorten" => "git_repo",
+             } = json_response(conn, 200)["data"]
+    end
+
+    test "renders errors when data is invalid", %{conn: conn} do
+      conn = post(conn, ~p"/api/v1/links", link: @invalid_attrs)
+      assert json_response(conn, 422)["errors"] != %{}
+    end
+  end
+
+  describe "update link" do
+    setup [:create_link]
+
+    test "renders link when data is valid", %{conn: conn, link: %Link{id: id} = link} do
+      conn = put(conn, ~p"/api/v1/links/#{id}", link: @update_attrs)
+      assert %{"id" => ^id} = json_response(conn, 200)["data"]
+
+      conn = get(conn, ~p"/api/v1/links/#{id}")
+
+      assert %{
+               "id" => ^id,
+	       "name" => "some updated link name",
+	       "url" => "https://gitlab.com/KKlochko/link_shortener2",
+	       "shorten" => "new_git_repo",
+             } = json_response(conn, 200)["data"]
+    end
+
+    test "renders errors when data is invalid", %{conn: conn, link: %Link{id: id} = link} do
+      conn = put(conn, ~p"/api/v1/links/#{id}", link: @invalid_attrs)
+      assert json_response(conn, 422)["errors"] != %{}
+    end
+  end
+
+  describe "delete link" do
+    setup [:create_link]
+
+    test "deletes chosen link", %{conn: conn, link: %Link{id: id} = link} do
+      conn = delete(conn, ~p"/api/v1/links/#{id}")
+      assert response(conn, 204)
+
+      assert_error_sent 404, fn ->
+	conn = get(conn, ~p"/api/v1/links/#{id}")
+      end
+    end
+  end
+
+  defp create_link(_) do
+    link = link_fixture()
+    %{link: link}
+  end
+end
+