Cache registrations_for_user (#663)

* cache registrations_for_user

* use caching in mine

app/controllers/internal_controller.rb

@@ -73,7 +73,9 @@ def list_registrations
 
   def registrations_for_user
     user_id = params.require(:user_id)
-    registrations = Registration.where(user_id: user_id).to_a
+    registrations = Rails.cache.fetch("#{user_id}-registrations-by-user") do
+      Registration.where(user_id: user_id).to_a
+    end
     render json: registrations
   end
 

app/controllers/registration_controller.rb

@@ -134,6 +134,9 @@ def process_update(update_request)
       EmailApi.send_update_email(@competition_id, user_id, status, @current_user)
     end
 
+    # Invalidate cache
+    Rails.cache.delete("#{user_id}-registrations-by-user")
+
     {
       user_id: updated_registration['user_id'],
       guests: updated_registration.guests,
@@ -178,7 +181,10 @@ def list
   end
 
   def mine
-    my_registrations = Registration.where(user_id: @current_user).map { |x| { competition_id: x.competition_id, status: x.competing_status } }
+    registrations = Rails.cache.fetch("#{@current_user}-registrations-by-user") do
+      Registration.where(user_id: @current_user).to_a
+    end
+    my_registrations = registrations.map { |x| { competition_id: x.competition_id, status: x.competing_status } }
     render json: my_registrations
   rescue Dynamoid::Errors::Error => e
     # Render an error response

app/jobs/registration_processor.rb

@@ -15,6 +15,9 @@ def perform(message)
                          message[:step_details][:guests],
                          message[:created_at])
     end
+
+    # Invalidate Cache
+    Rails.cache.delete("#{message[:user_id]}-registrations-by-user")
   end
 
   private