User table: ensure bio is always a string

Gets rid of '|| ""' in multiple places and fixes #2067

lib/pleroma/user.ex

@@ -83,7 +83,7 @@ defmodule Pleroma.User do
   ]
 
   schema "users" do
-    field(:bio, :string)
+    field(:bio, :string, default: "")
     field(:raw_bio, :string)
     field(:email, :string)
     field(:name, :string)
@@ -1587,7 +1587,7 @@ def purge_user_changeset(user) do
     # "Right to be forgotten"
     # https://gdpr.eu/right-to-be-forgotten/
     change(user, %{
-      bio: nil,
+      bio: "",
       raw_bio: nil,
       email: nil,
       name: nil,

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1224,7 +1224,7 @@ defp object_to_user_data(data) do
       name: data["name"],
       follower_address: data["followers"],
       following_address: data["following"],
-      bio: data["summary"],
+      bio: data["summary"] || "",
       actor_type: actor_type,
       also_known_as: Map.get(data, "alsoKnownAs", []),
       public_key: public_key,

lib/pleroma/web/auth/pleroma_authenticator.ex

@@ -68,7 +68,7 @@ def create_from_registration(
     nickname = value([registration_attrs["nickname"], Registration.nickname(registration)])
     email = value([registration_attrs["email"], Registration.email(registration)])
     name = value([registration_attrs["name"], Registration.name(registration)]) || nickname
-    bio = value([registration_attrs["bio"], Registration.description(registration)])
+    bio = value([registration_attrs["bio"], Registration.description(registration)]) || ""
 
     random_password = :crypto.strong_rand_bytes(64) |> Base.encode64()
 

lib/pleroma/web/mastodon_api/views/account_view.ex

@@ -245,7 +245,7 @@ defp do_render("show.json", %{user: user} = opts) do
       followers_count: followers_count,
       following_count: following_count,
       statuses_count: user.note_count,
-      note: user.bio || "",
+      note: user.bio,
       url: user.uri || user.ap_id,
       avatar: image,
       avatar_static: image,

lib/pleroma/web/metadata/opengraph.ex

@@ -61,7 +61,7 @@ def build_tags(%{
 
   @impl Provider
   def build_tags(%{user: user}) do
-    with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do
+    with truncated_bio = Utils.scrub_html_and_truncate(user.bio) do
       [
         {:meta,
          [

lib/pleroma/web/metadata/twitter_card.ex

@@ -40,7 +40,7 @@ def build_tags(%{activity_id: id, object: object, user: user}) do
 
   @impl Provider
   def build_tags(%{user: user}) do
-    with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do
+    with truncated_bio = Utils.scrub_html_and_truncate(user.bio) do
       [
         title_tag(user),
         {:meta, [property: "twitter:description", content: truncated_bio], []},

priv/repo/migrations/20200901061256_ensure_bio_is_string.exs

@@ -0,0 +1,7 @@
+defmodule Pleroma.Repo.Migrations.EnsureBioIsString do
+  use Ecto.Migration
+
+  def change do
+    execute("update users set bio = '' where bio is null", "")
+  end
+end

priv/repo/migrations/20200901061637_bio_set_not_null.exs

@@ -0,0 +1,10 @@
+defmodule Pleroma.Repo.Migrations.BioSetNotNull do
+  use Ecto.Migration
+
+  def change do
+    execute(
+      "alter table users alter column bio set not null",
+      "alter table users alter column bio drop not null"
+    )
+  end
+end

test/user_test.exs

@@ -1466,7 +1466,7 @@ test "delete/1 purges a user when they wouldn't be fully deleted" do
     user = User.get_by_id(user.id)
 
     assert %User{
-             bio: nil,
+             bio: "",
              raw_bio: nil,
              email: nil,
              name: nil,

test/web/admin_api/controllers/admin_api_controller_test.exs

@@ -203,7 +203,7 @@ test "single user", %{admin: admin, conn: conn} do
         assert user.note_count == 0
         assert user.follower_count == 0
         assert user.following_count == 0
-        assert user.bio == nil
+        assert user.bio == ""
         assert user.name == nil
 
         assert called(Pleroma.Web.Federator.publish(:_))

test/web/twitter_api/util_controller_test.exs

@@ -594,7 +594,7 @@ test "with proper permissions and valid password", %{conn: conn, user: user} do
       user = User.get_by_id(user.id)
       assert user.deactivated == true
       assert user.name == nil
-      assert user.bio == nil
+      assert user.bio == ""
       assert user.password_hash == nil
     end
   end