Remove unnecessary double caching (in hash and request store)

app/models/project.rb

@@ -1932,23 +1932,11 @@ class Project < ActiveRecord::Base
   end
 
   def any_branch_allows_collaboration?(user)
-    return false unless user
-
     fetch_branch_allows_collaboration(user)
   end
 
   def branch_allows_collaboration?(user, branch_name)
-    return false unless user
-
-    cache_key = "user:#{user.id}:#{branch_name}:branch_allows_push"
-
-    memoized_results = strong_memoize(:branch_allows_collaboration) do
-      Hash.new do |result, cache_key|
-        result[cache_key] = fetch_branch_allows_collaboration(user, branch_name)
-      end
-    end
-
-    memoized_results[cache_key]
+    fetch_branch_allows_collaboration(user, branch_name)
   end
 
   def licensed_features
@@ -2153,6 +2141,8 @@ class Project < ActiveRecord::Base
   end
 
   def fetch_branch_allows_collaboration(user, branch_name = nil)
+    return false unless user
+
     Gitlab::SafeRequestStore.fetch("project-#{id}:branch-#{branch_name}:user-#{user.id}:branch_allows_collaboration") do
       next false if empty_repo?
 

spec/models/project_spec.rb

@@ -3932,13 +3932,6 @@ describe Project do
           .to be_falsy
       end
 
-      it 'caches the result' do
-        control = ActiveRecord::QueryRecorder.new { project.branch_allows_collaboration?(user, 'awesome-feature-1') }
-
-        expect { 3.times { project.branch_allows_collaboration?(user, 'awesome-feature-1') } }
-          .not_to exceed_query_limit(control)
-      end
-
       context 'when the requeststore is active', :request_store do
         it 'only queries per project across instances' do
           control = ActiveRecord::QueryRecorder.new { project.branch_allows_collaboration?(user, 'awesome-feature-1') }

spec/serializers/pipeline_serializer_spec.rb

@@ -144,7 +144,7 @@ describe PipelineSerializer do
           # pipeline. With the same ref this check is cached but if refs are
           # different then there is an extra query per ref
           # https://gitlab.com/gitlab-org/gitlab-ce/issues/46368
-          expect(recorded.count).to be_within(2).of(34)
+          expect(recorded.count).to be_within(2).of(38)
           expect(recorded.cached_count).to eq(0)
         end
       end