Fix friends-of-friends recommendations suggesting already-requested accounts (#35604)

app/models/account_suggestions/friends_of_friends_source.rb

@@ -26,6 +26,7 @@ class AccountSuggestions::FriendsOfFriendsSource < AccountSuggestions::Source
         AND NOT EXISTS (SELECT 1 FROM mutes m WHERE m.target_account_id = follows.target_account_id AND m.account_id = :id)
         AND (accounts.domain IS NULL OR NOT EXISTS (SELECT 1 FROM account_domain_blocks b WHERE b.account_id = :id AND b.domain = accounts.domain))
         AND NOT EXISTS (SELECT 1 FROM follows f WHERE f.target_account_id = follows.target_account_id AND f.account_id = :id)
+        AND NOT EXISTS (SELECT 1 FROM follow_requests f WHERE f.target_account_id = follows.target_account_id AND f.account_id = :id)
         AND follows.target_account_id <> :id
         AND accounts.discoverable
         AND accounts.suspended_at IS NULL

spec/models/account_suggestions/friends_of_friends_source_spec.rb

@@ -16,10 +16,12 @@ RSpec.describe AccountSuggestions::FriendsOfFriendsSource do
     let!(:jerk) { Fabricate(:account, discoverable: true, hide_collections: false) }
     let!(:larry) { Fabricate(:account, discoverable: true, hide_collections: false) }
     let!(:morty) { Fabricate(:account, discoverable: true, hide_collections: false, memorial: true) }
+    let!(:joyce) { Fabricate(:account, discoverable: true, hide_collections: false) }
 
     context 'with follows and blocks' do
       before do
         bob.block!(jerk)
+        bob.request_follow!(joyce)
         FollowRecommendationMute.create!(account: bob, target_account: neil)
 
         # bob follows eugen, alice and larry
@@ -28,8 +30,8 @@ RSpec.describe AccountSuggestions::FriendsOfFriendsSource do
         # alice follows eve and mallory
         [john, mallory].each { |account| alice.follow!(account) }
 
-        # eugen follows eve, john, jerk, larry, neil and morty
-        [eve, mallory, jerk, larry, neil, morty].each { |account| eugen.follow!(account) }
+        # eugen follows eve, john, jerk, larry, neil, morty and joyce
+        [eve, mallory, jerk, larry, neil, morty, joyce].each { |account| eugen.follow!(account) }
       end
 
       it 'returns eligible accounts', :aggregate_failures do
@@ -55,6 +57,9 @@ RSpec.describe AccountSuggestions::FriendsOfFriendsSource do
 
         # morty is not included because his account is in memoriam
         expect(results).to_not include([morty.id, :friends_of_friends])
+
+        # joyce is not included because there is already a pending follow request
+        expect(results).to_not include([joyce.id, :friends_of_friends])
       end
     end