display tag/source change counters on image pages

lib/philomena_web/controllers/image/source_controller.ex

@@ -1,9 +1,12 @@
 defmodule PhilomenaWeb.Image.SourceController do
   use PhilomenaWeb, :controller
 
+  alias Philomena.SourceChanges.SourceChange
   alias Philomena.UserStatistics
   alias Philomena.Images.Image
   alias Philomena.Images
+  alias Philomena.Repo
+  import Ecto.Query
 
   plug PhilomenaWeb.FilterBannedUsersPlug
   plug PhilomenaWeb.CaptchaPlug
@@ -20,16 +23,21 @@ defmodule PhilomenaWeb.Image.SourceController do
         changeset =
           Images.change_image(image)
 
+        source_change_count =
+          SourceChange
+          |> where(image_id: ^image.id)
+          |> Repo.aggregate(:count, :id)
+
         UserStatistics.inc_stat(conn.assigns.current_user, :metadata_updates)
 
         conn
         |> put_view(PhilomenaWeb.ImageView)
-        |> render("_source.html", layout: false, image: image, changeset: changeset)
+        |> render("_source.html", layout: false, source_change_count: source_change_count, image: image, changeset: changeset)
 
       {:error, :image, changeset, _} ->
         conn
         |> put_view(PhilomenaWeb.ImageView)
-        |> render("_source.html", layout: false, image: image, changeset: changeset)
+        |> render("_source.html", layout: false, source_change_count: 0, image: image, changeset: changeset)
     end
   end
 end

lib/philomena_web/controllers/image/tag_controller.ex

@@ -1,11 +1,13 @@
 defmodule PhilomenaWeb.Image.TagController do
   use PhilomenaWeb, :controller
 
+  alias Philomena.TagChanges.TagChange
   alias Philomena.UserStatistics
   alias Philomena.Images.Image
   alias Philomena.Images
   alias Philomena.Tags
   alias Philomena.Repo
+  import Ecto.Query
 
   plug PhilomenaWeb.FilterBannedUsersPlug
   plug PhilomenaWeb.CaptchaPlug
@@ -23,6 +25,11 @@ defmodule PhilomenaWeb.Image.TagController do
         Tags.reindex_tags(added_tags ++ removed_tags)
         UserStatistics.inc_stat(conn.assigns.current_user, :metadata_updates)
 
+        tag_change_count =
+          TagChange
+          |> where(image_id: ^image.id)
+          |> Repo.aggregate(:count, :id)
+
         image =
           image
           |> Repo.preload(:tags, force: true)
@@ -32,12 +39,12 @@ defmodule PhilomenaWeb.Image.TagController do
 
         conn
         |> put_view(PhilomenaWeb.ImageView)
-        |> render("_tags.html", layout: false, image: image, changeset: changeset)
+        |> render("_tags.html", layout: false, tag_change_count: tag_change_count, image: image, changeset: changeset)
 
       {:error, :image, changeset, _} ->
         conn
         |> put_view(PhilomenaWeb.ImageView)
-        |> render("_tags.html", layout: false, image: image, changeset: changeset)
+        |> render("_tags.html", layout: false, tag_change_count: 0, image: image, changeset: changeset)
     end
   end
 end

lib/philomena_web/controllers/image_controller.ex

@@ -139,10 +139,13 @@ defmodule PhilomenaWeb.ImageController do
   defp load_image(conn, _opts) do
     id = conn.params["id"]
 
-    image =
+    {image, tag_changes, source_changes} =
       Image
       |> where(id: ^id)
+      |> join(:inner_lateral, [i], _ in fragment("SELECT COUNT(*) FROM tag_changes t WHERE t.image_id = ?", i.id))
+      |> join(:inner_lateral, [i, _], _ in fragment("SELECT COUNT(*) FROM source_changes s WHERE s.image_id = ?", i.id))
       |> preload([:tags, :deleter, user: [awards: :badge]])
+      |> select([i, t, s], {i, t.count, s.count})
       |> Repo.one()
 
     cond do
@@ -158,7 +161,10 @@ defmodule PhilomenaWeb.ImageController do
         render(conn, "deleted.html", image: image)
 
       true ->
-        assign(conn, :image, image)
+        conn
+        |> assign(:image, image)
+        |> assign(:tag_change_count, tag_changes)
+        |> assign(:source_change_count, source_changes)
     end
   end
 end

lib/philomena_web/templates/image/_source.html.slime

@@ -35,6 +35,9 @@
       - else
         em> not provided yet
 
+      = if @source_change_count > 0 do
         a.button.button--link.button--separate-left href=Routes.image_source_change_path(@conn, :index, @image) title="Source history"
           i.fa.fa-history>
-        ' History
+          | History (
+          = @source_change_count
+          | )

lib/philomena_web/templates/image/_tags.html.slime

@@ -55,8 +55,11 @@
         i.fas.fa-edit>
         ' Tags:
 
+      = if @tag_change_count > 0 do
         a.button.button--link.button--separate-left href=Routes.image_tag_change_path(@conn, :index, @image) title="Tag history"
           i.fa.fa-history>
-        ' History
+          | History (
+          = @tag_change_count
+          | )
 
     = render PhilomenaWeb.TagView, "_tag_list.html", tags: display_order(@image.tags), conn: @conn

lib/philomena_web/templates/image/show.html.slime

@@ -9,8 +9,8 @@
     = render PhilomenaWeb.ImageView, "_description.html", image: @image, body: @description, conn: @conn
   = render PhilomenaWeb.Image.DescriptionView, "_form.html", image: @image, changeset: @image_changeset, conn: @conn
 
-  = render PhilomenaWeb.ImageView, "_tags.html", image: @image, changeset: @image_changeset, conn: @conn
+  = render PhilomenaWeb.ImageView, "_tags.html", image: @image, tag_change_count: @tag_change_count, changeset: @image_changeset, conn: @conn
-  = render PhilomenaWeb.ImageView, "_source.html", image: @image, changeset: @image_changeset, conn: @conn
+  = render PhilomenaWeb.ImageView, "_source.html", image: @image, source_change_count: @source_change_count, changeset: @image_changeset, conn: @conn
   = render PhilomenaWeb.ImageView, "_options.html", image: @image, conn: @conn
 
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