Cache project/user combinations.

1 files changed, 19 insertions, 3 deletions

diff --git a/app/models/user_contributed_projects.rb b/app/models/user_contributed_projects.rb
index 846d77f3c69..e051e75af1d 100644
--- a/app/models/user_contributed_projects.rb
+++ b/app/models/user_contributed_projects.rb
@@ -5,9 +5,25 @@ class UserContributedProjects < ActiveRecord::Base
   validates :project, presence: true
   validates :user, presence: true
 
+  CACHE_EXPIRY_TIME = 1.day
+
   def self.track(event)
-    find_or_create_by!(project: event.project, user: event.author)
-  rescue ActiveRecord::RecordNotUnique
-    retry
+    attributes = {project_id: event.project_id, user_id: event.author_id}
+
+    cached_exists?(attributes) do
+      begin
+        find_or_create_by!(attributes)
+        true # not caching the whole record here for now
+      rescue ActiveRecord::RecordNotUnique
+        retry
+      end
+    end
+  end
+
+  private
+
+  def self.cached_exists?(project_id:, user_id:, &block)
+    cache_key = "user_contributed_projects:#{project_id}:#{user_id}"
+    Rails.cache.fetch(cache_key, expires_in: CACHE_EXPIRY_TIME, &block)
   end
 end