#41

backend/app/controllers/gekanator_questions_controller.rb

@@ -2,7 +2,11 @@ class GekanatorQuestionsController < ApplicationController
   def index
     return head :not_found unless current_user&.admin?
 
-    questions = GekanatorQuestion.accepted.order(priority_weight: :desc, id: :asc)
+    questions =
+        GekanatorQuestion
+        .accepted
+        .includes(:gekanator_question_examples)
+        .order(priority_weight: :desc, id: :asc)
 
     render json: {
       questions: questions.map { |question| question_json(question) }
@@ -12,7 +16,7 @@ class GekanatorQuestionsController < ApplicationController
   private
 
   def question_json question
-    {
+    json = {
       id: question_id_for(question),
       text: question.text,
       kind: question.kind,
@@ -20,6 +24,10 @@ class GekanatorQuestionsController < ApplicationController
       source: question.source,
       priority_weight: question.priority_weight
     }
+    if question.kind == 'post_similarity'
+      json[:example_answers] = example_answers_json(question)
+    end
+    json
   end
 
   def question_id_for question
@@ -40,6 +48,8 @@ class GekanatorQuestionsController < ApplicationController
       "title:length-greater-than:#{ condition[:length] }"
     when 'title-has-ascii'
       'title:ascii'
+    when 'post-similarity'
+      "post-similarity:#{ question.id }"
     else
       "catalog:#{ question.id }"
     end
@@ -54,4 +64,20 @@ class GekanatorQuestionsController < ApplicationController
 
     json
   end
+
+  def example_answers_json question
+    question
+        .gekanator_question_examples
+        .group_by(&:post_id)
+        .transform_values { |examples| aggregate_answer(examples) }
+  end
+
+  def aggregate_answer examples
+    examples
+        .group_by(&:answer)
+        .map { |answer, grouped| [answer, grouped.sum(&:weight), grouped.max_by(&:updated_at)&.updated_at] }
+        .sort_by { |(_answer, weight, updated_at)| [-weight, -(updated_at&.to_f || 0)] }
+        .first
+        &.first
+  end
 end