Remove optimized_count_users_by_group_id FF

app/models/members/group_member.rb

@@ -17,14 +17,7 @@ class GroupMember < Member
 
   scope :of_groups, ->(groups) { where(source_id: groups.select(:id)) }
   scope :of_ldap_type, -> { where(ldap: true) }
-
-  scope :count_users_by_group_id, -> do
-    if Feature.enabled?(:optimized_count_users_by_group_id)
-      group(:source_id).count
-    else
-      joins(:user).group(:source_id).count
-    end
-  end
+  scope :count_users_by_group_id, -> { group(:source_id).count }
 
   after_create :update_two_factor_requirement, unless: :invite?
   after_destroy :update_two_factor_requirement, unless: :invite?

changelogs/unreleased/remove-ff-in-count-users-by-group.yml

+---
+title: Remove optimized_count_users_by_group_id feature flag
+merge_request: 36953
+author:
+type: performance

spec/models/members/group_member_spec.rb

@@ -4,7 +4,6 @@ require 'spec_helper'
 
 RSpec.describe GroupMember do
   context 'scopes' do
-    shared_examples '.count_users_by_group_id' do
     it 'counts users by group ID' do
       user_1 = create(:user)
       user_2 = create(:user)
@@ -18,37 +17,6 @@ RSpec.describe GroupMember do
       expect(described_class.count_users_by_group_id).to eq(group_1.id => 2,
                                                             group_2.id => 1)
     end
-    end
-
-    describe '.count_users_by_group_id with optimized_count_users_by_group_id feature flag on' do
-      before do
-        stub_feature_flags(optimized_count_users_by_group_id: true)
-      end
-
-      it_behaves_like '.count_users_by_group_id'
-
-      it 'does not JOIN users' do
-        scope = described_class.all
-        expect(scope).not_to receive(:joins).with(:user)
-
-        scope.count_users_by_group_id
-      end
-    end
-
-    describe '.count_users_by_group_id with optimized_count_users_by_group_id feature flag off' do
-      before do
-        stub_feature_flags(optimized_count_users_by_group_id: false)
-      end
-
-      it_behaves_like '.count_users_by_group_id'
-
-      it 'does JOIN users' do
-        scope = described_class.all
-        expect(scope).to receive(:joins).with(:user).and_call_original
-
-        scope.count_users_by_group_id
-      end
-    end
 
     describe '.of_ldap_type' do
       it 'returns ldap type users' do