fix: resolved duplicate recommendation generation issue

Author: t9nzin

app/controllers/pages_controller.rb

@@ -36,12 +36,11 @@ def initialize_guest_data
   def load_recommendations
     # Check if recommendations exist and are fresh
     if Recommendation.fresh_for_user?(current_user)
-      # Load cached recommendations
-      @recommended_animes = current_user.recommended_animes
-                                       .joins(:recommendations)
-                                       .where(recommendations: { user_id: current_user.id })
-                                       .merge(Recommendation.top(12))  # Show top 12
-                                       .to_a
+      # Load top 12 recommendations with anime preloaded
+      recommendations = current_user.recommendations
+                                   .includes(:anime)
+                                   .top(12)
+      @recommended_animes = recommendations.map(&:anime)
     else
       # Recommendations stale or don't exist - show cold start
       @recommended_animes = load_cold_start_recommendations

app/services/recommendation_engine.rb

@@ -48,9 +48,9 @@ def fetch_candidate_anime
     collab_candidates = fetch_collaborative_candidates
     popular_candidates = fetch_popular_candidates
 
-    # combine and deduplicate
+    # combine and deduplicate by anime ID
     (genre_candidates + collab_candidates + popular_candidates)
-      .uniq
+      .uniq(&:id)
       # filter out anime alr in the user's anime list
       .reject { |anime| @user_anime_ids.include?(anime.id) }
       # grab first CANDIDATE_LIMIT items