[#1335] Applied code review suggestions.

lib/pleroma/user.ex

@@ -1090,11 +1090,10 @@ def blocked_users(user) do
   end
 
   def blocked_ap_ids(user) do
-    Repo.all(
-      from(u in assoc(user, :blocked_users),
-        select: u.ap_id
-      )
-    )
+    user
+    |> assoc(:blocked_users)
+    |> select([u], u.ap_id)
+    |> Repo.all()
   end
 
   @spec subscribers(User.t()) :: [User.t()]

lib/pleroma/user/search.ex

@@ -99,17 +99,12 @@ defp base_query(_user, false), do: User
   defp base_query(user, true), do: User.get_followers_query(user)
 
   defp filter_blocked_user(query, %User{} = blocker) do
-    blocker_id = FlakeId.from_string(blocker.id)
-
-    from(
-      q in query,
-      where:
-        fragment(
-          "? NOT IN (SELECT blockee_id FROM user_blocks WHERE user_blocks.blocker_id = ?)",
-          q.id,
-          ^blocker_id
-        )
+    query
+    |> join(:left, [u], b in Pleroma.UserBlock,
+      as: :blocks,
+      on: b.blocker_id == ^blocker.id and u.id == b.blockee_id
     )
+    |> where([blocks: b], is_nil(b.blockee_id))
   end
 
   defp filter_blocked_user(query, _), do: query

lib/pleroma/user_block.ex

@@ -45,24 +45,23 @@ def create(%User{} = blocker, %User{} = blockee) do
   def delete(%User{} = blocker, %User{} = blockee) do
     attrs = %{blocker_id: blocker.id, blockee_id: blockee.id}
 
-    if is_nil(existing_record = Repo.get_by(UserBlock, attrs)) do
-      {:ok, nil}
-    else
-      Repo.delete(existing_record)
+    case Repo.get_by(UserBlock, attrs) do
+      %UserBlock{} = existing_record -> Repo.delete(existing_record)
+      nil -> {:ok, nil}
     end
   end
 
   defp validate_not_self_block(%Ecto.Changeset{} = changeset) do
     changeset
     |> validate_change(:blockee_id, fn _, blockee_id ->
-      if blockee_id == changeset.changes[:blocker_id] || changeset.data.blocker_id do
+      if blockee_id == get_field(changeset, :blocker_id) do
         [blockee_id: "can't be equal to blocker_id"]
       else
         []
       end
     end)
     |> validate_change(:blocker_id, fn _, blocker_id ->
-      if blocker_id == changeset.changes[:blockee_id] || changeset.data.blockee_id do
+      if blocker_id == get_field(changeset, :blockee_id) do
         [blocker_id: "can't be equal to blockee_id"]
       else
         []