Shortcut when all levels visible.

app/models/project.rb

@@ -325,6 +325,12 @@ class Project < ActiveRecord::Base
 
       levels = Gitlab::VisibilityLevel.levels_for_user(user)
 
+      if Gitlab::VisibilityLevel.all_levels?(levels)
+        # If the user is allowed to see all projects,
+        # we can shortcut and just return.
+        return all
+      end
+
       authorized_projects = where('EXISTS (?)', authorized).select(:id)
       visible_projects = where('visibility_level IN (?)', levels).select(:id)
 

lib/gitlab/visibility_level.rb

@@ -20,6 +20,7 @@ module Gitlab
     PRIVATE  = 0 unless const_defined?(:PRIVATE)
     INTERNAL = 10 unless const_defined?(:INTERNAL)
     PUBLIC   = 20 unless const_defined?(:PUBLIC)
+    ALL_LEVELS = [PRIVATE, INTERNAL, PUBLIC].freeze unless const_defined?(:ALL_LEVELS)
 
     class << self
       delegate :values, to: :options
@@ -28,7 +29,7 @@ module Gitlab
         return [PUBLIC] unless user
 
         if user.full_private_access?
-          [PRIVATE, INTERNAL, PUBLIC]
+          ALL_LEVELS
         elsif user.external?
           [PUBLIC]
         else
@@ -36,6 +37,10 @@ module Gitlab
         end
       end
 
+      def all_levels?(levels = [])
+        levels&.sort == ALL_LEVELS
+      end
+
       def string_values
         string_options.keys
       end

spec/lib/gitlab/visibility_level_spec.rb

@@ -50,6 +50,28 @@ describe Gitlab::VisibilityLevel do
     end
   end
 
+  describe '.all_levels?' do
+    let(:levels) do
+      [
+        Gitlab::VisibilityLevel::PUBLIC,
+        Gitlab::VisibilityLevel::INTERNAL,
+        Gitlab::VisibilityLevel::PRIVATE
+      ].shuffle
+    end
+
+    it 'returns true only when given all levels defined at once' do
+      expect(described_class.all_levels?(levels)).to be_truthy
+    end
+
+    it 'returns true for ALL_LEVELS' do
+      expect(described_class.all_levels?(Gitlab::VisibilityLevel::ALL_LEVELS)).to be_truthy
+    end
+
+    it 'returns false if any one level is missing' do
+      expect(described_class.all_levels?(levels[0..-2])).to be_falsey
+    end
+  end
+
   describe '.allowed_levels' do
     it 'only includes the levels that arent restricted' do
       stub_application_setting(restricted_visibility_levels: [Gitlab::VisibilityLevel::INTERNAL])