Fix eager loading in questions and answers

Author: momo3404

app/controllers/api/v2/plans_controller.rb

@@ -10,7 +10,7 @@ class PlansController < BaseApiController # rubocop:todo Style/Documentation
       def show
         raise Pundit::NotAuthorizedError unless @scopes.include?('read')
 
-        @plan = Plan.find_by(id: params[:id])
+        @plan = Plan.includes(roles: :user).find(params[:id])
 
         raise Pundit::NotAuthorizedError unless @plan.present?
 

app/presenters/api/v2/plan_presenter.rb

@@ -60,16 +60,17 @@ def plan_costs(plan:)
 
       # Fetch all questions and answers from a plan, regardless of theme
       def fetch_all_q_and_a
-        return [] unless @plan.questions.present?
+        answers = @plan.answers.includes(:question)
+        return [] unless answers.present?
 
-        @plan.questions.filter_map do |q|
-          a = @plan.answers.find { |ans| ans.question_id == q.id }
-          next unless a.present?
+        answers.filter_map do |answer|
+          q = answer.question
+          next unless q.present?
 
           {
             title: "Question #{q.number || q.id}",
             question: q.text.to_s,
-            answer: a.text.to_s
+            answer: answer.text.to_s
           }
         end
       end