Improve relationship UI handling (#42)

* Added tabbed view; improved relationships for media profile

* Adds new maybe_limit method for queries

* Improves UI for media items, associated tasks

test/pinchflat/repo_test.exs

@@ -1,6 +1,9 @@
 defmodule Pinchflat.RepoTest do
   use Pinchflat.DataCase
+  import Pinchflat.ProfilesFixtures
 
+  alias Pinchflat.Repo
+  alias Pinchflat.Profiles.MediaProfile
   alias Pinchflat.JobFixtures.TestJobWorker
 
   describe "insert_unique_job/1" do
@@ -23,4 +26,30 @@ defmodule Pinchflat.RepoTest do
       assert {:error, _} = Pinchflat.Repo.insert_unique_job(%Ecto.Changeset{})
     end
   end
+
+  describe "maybe_limit/2" do
+    test "applies a limit if provided" do
+      media_profile_fixture()
+      media_profile_fixture()
+
+      result =
+        MediaProfile
+        |> Repo.maybe_limit(1)
+        |> Repo.aggregate(:count, :id)
+
+      assert result == 1
+    end
+
+    test "does not apply a limit if not provided" do
+      media_profile_fixture()
+      media_profile_fixture()
+
+      result =
+        MediaProfile
+        |> Repo.maybe_limit(nil)
+        |> Repo.aggregate(:count, :id)
+
+      assert result == 2
+    end
+  end
 end