Filter direct statuses in Status.as_home_timeline (#3842)

The classes using Status.as_home_timeline, namely Feed and
PrecomputeFeedService are expected to filter direct statuses as
FanOutWriteService does, but their filtering were incomplete or missing.

This commit solves the problem by filtering direct statuses in
as_home_timeline as the other similar methods such as as_public_timeline
does.

app/models/status.rb

@@ -131,7 +131,15 @@ class Status < ApplicationRecord
     end
 
     def as_home_timeline(account)
-      where(account: [account] + account.following)
+      # 'references' is a workaround for the following issue:
+      # Inconsistent results with #or in ActiveRecord::Relation with respect to documentation Issue #24055 rails/rails
+      # https://github.com/rails/rails/issues/24055
+      references(:mentions)
+        .where.not(visibility: :direct)
+        .or(where(mentions: { account: account }))
+        .where(follows: { account_id: account })
+        .or(references(:mentions, :follows).where(account: account))
+        .left_outer_joins(account: :followers).left_outer_joins(:mentions).group(:id)
     end
 
     def as_public_timeline(account = nil, local_only = false)

app/services/precompute_feed_service.rb

@@ -23,11 +23,7 @@ class PrecomputeFeedService < BaseService
   end
 
   def process_status(status)
-    add_status_to_feed(status) unless skip_status?(status)
-  end
-
-  def skip_status?(status)
-    status.direct_visibility? || status_filtered?(status)
+    add_status_to_feed(status) unless status_filtered?(status)
   end
 
   def add_status_to_feed(status)

spec/models/status_spec.rb

@@ -181,15 +181,18 @@ RSpec.describe Status, type: :model do
   end
 
   describe '.as_home_timeline' do
+    let(:account) { Fabricate(:account) }
+    let(:followed) { Fabricate(:account) }
+    let(:not_followed) { Fabricate(:account) }
+
     before do
-      account = Fabricate(:account)
-      followed = Fabricate(:account)
-      not_followed = Fabricate(:account)
       Fabricate(:follow, account: account, target_account: followed)
 
-      @self_status = Fabricate(:status, account: account)
-      @followed_status = Fabricate(:status, account: followed)
-      @not_followed_status = Fabricate(:status, account: not_followed)
+      @self_status = Fabricate(:status, account: account, visibility: :public)
+      @self_direct_status = Fabricate(:status, account: account, visibility: :direct)
+      @followed_status = Fabricate(:status, account: followed, visibility: :public)
+      @followed_direct_status = Fabricate(:status, account: followed, visibility: :direct)
+      @not_followed_status = Fabricate(:status, account: not_followed, visibility: :public)
 
       @results = Status.as_home_timeline(account)
     end
@@ -198,10 +201,23 @@ RSpec.describe Status, type: :model do
       expect(@results).to include(@self_status)
     end
 
+    it 'includes direct statuses from self' do
+      expect(@results).to include(@self_direct_status)
+    end
+
     it 'includes statuses from followed' do
       expect(@results).to include(@followed_status)
     end
 
+    it 'includes direct statuses mentioning recipient from followed' do
+      Fabricate(:mention, account: account, status: @followed_direct_status)
+      expect(@results).to include(@followed_direct_status)
+    end
+
+    it 'does not include direct statuses not mentioning recipient from followed' do
+      expect(@results).not_to include(@followed_direct_status)
+    end
+
     it 'does not include statuses from non-followed' do
       expect(@results).not_to include(@not_followed_status)
     end