Merge branch 'issue/2089' into 'develop'

[#2089] fix notifications

See merge request pleroma/pleroma!3000

priv/repo/migrations/20200914105638_delete_notification_without_activity.exs

@@ -0,0 +1,30 @@
+defmodule Pleroma.Repo.Migrations.DeleteNotificationWithoutActivity do
+  use Ecto.Migration
+
+  import Ecto.Query
+  alias Pleroma.Repo
+
+  def up do
+    from(
+      q in Pleroma.Notification,
+      left_join: c in assoc(q, :activity),
+      select: %{id: type(q.id, :integer)},
+      where: is_nil(c.id)
+    )
+    |> Repo.chunk_stream(1_000, :batches)
+    |> Stream.each(fn records ->
+      notification_ids = Enum.map(records, fn %{id: id} -> id end)
+
+      Repo.delete_all(
+        from(n in "notifications",
+          where: n.id in ^notification_ids
+        )
+      )
+    end)
+    |> Stream.run()
+  end
+
+  def down do
+    :ok
+  end
+end

priv/repo/migrations/20200914105800_add_notification_constraints.exs

@@ -0,0 +1,23 @@
+defmodule Pleroma.Repo.Migrations.AddNotificationConstraints do
+  use Ecto.Migration
+
+  def up do
+    drop(constraint(:notifications, "notifications_activity_id_fkey"))
+
+    alter table(:notifications) do
+      modify(:activity_id, references(:activities, type: :uuid, on_delete: :delete_all),
+        null: false
+      )
+    end
+  end
+
+  def down do
+    drop(constraint(:notifications, "notifications_activity_id_fkey"))
+
+    alter table(:notifications) do
+      modify(:activity_id, references(:activities, type: :uuid, on_delete: :delete_all),
+        null: true
+      )
+    end
+  end
+end