#41

backend/app/controllers/gekanator_games_controller.rb

@@ -20,4 +20,91 @@ class GekanatorGamesController < ApplicationController
       render json: { errors: game.errors.full_messages }, status: :unprocessable_entity
     end
   end
+
+  def extra_questions
+    return head :not_found unless current_user&.admin?
+
+    game = GekanatorGame.find_by(id: params[:id])
+    return head :not_found unless game
+
+    asked_ids = Array(game.answers).filter_map { |answer|
+      answer['questionId'] || answer[:questionId]
+    }
+    existing_example_ids =
+        GekanatorQuestionExample.where(post_id: game.correct_post_id)
+                                .select(:gekanator_question_id)
+    questions =
+        GekanatorQuestion
+        .accepted
+        .where(kind: 'post_similarity', source: 'user_suggested')
+        .where.not(id: existing_example_ids)
+        .order(priority_weight: :desc, id: :asc)
+
+    render json: {
+      questions: questions.filter_map { |question|
+        json = extra_question_json(question)
+        next if asked_ids.include?(json[:id].to_s)
+        next if asked_ids.include?("post-similarity:#{ json[:id] }")
+
+        json
+      }.first(2)
+    }
+  end
+
+  def extra_question_answers
+    return head :not_found unless current_user&.admin?
+
+    game = GekanatorGame.find_by(id: params[:id])
+    return head :not_found unless game
+
+    answer_params = params.require(:answers)
+    if !answer_params.is_a?(Array)
+      return render_validation_error fields: { answers: ['配列で指定してください．'] }
+    end
+
+    answers = answer_params.map { |answer|
+      {
+        question_id: answer.require(:question_id),
+        answer: answer.require(:answer)
+      }
+    }
+    questions = GekanatorQuestion.where(id: answers.map { _1[:question_id] })
+    question_by_id = questions.index_by(&:id)
+    if questions.length != answers.length
+      return render_validation_error fields: { answers: ['質問が見つかりません．'] }
+    end
+    if questions.any? { |question| question.status != 'accepted' || question.kind != 'post_similarity' }
+      return render_validation_error fields: { answers: ['質問が不正です．'] }
+    end
+
+    ActiveRecord::Base.transaction do
+      answers.each do |item|
+        question = question_by_id[item[:question_id]]
+        example =
+            GekanatorQuestionExample.find_or_initialize_by(
+                gekanator_question: question,
+                post: game.correct_post,
+                user: current_user)
+        example.assign_attributes(
+            gekanator_game: game,
+            answer: item[:answer],
+            source: 'post_game_extra',
+            weight: 1.0)
+        example.save!
+      end
+    end
+
+    render json: { count: answers.length }, status: :created
+  end
+
+  private
+
+  def extra_question_json question
+    {
+      id: question.id,
+      text: question.text,
+      source: question.source,
+      priority_weight: question.priority_weight
+    }
+  end
 end

backend/app/controllers/gekanator_question_suggestions_controller.rb

@@ -11,7 +11,14 @@ class GekanatorQuestionSuggestionsController < ApplicationController
         question_text: params.require(:question_text),
         answer: params.require(:answer))
 
-    if suggestion.save
+    if suggestion.valid?
+      ActiveRecord::Base.transaction do
+        suggestion.save!
+        Gekanator::QuestionSuggestionPromoter.call(
+            suggestion: suggestion,
+            user: current_user)
+      end
+
       render json: {
         id: suggestion.id,
         count: game.question_suggestions.count

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

backend/app/models/gekanator_game.rb

@@ -5,6 +5,9 @@ class GekanatorGame < ApplicationRecord
   has_many :question_suggestions,
            class_name: 'GekanatorQuestionSuggestion',
            dependent: :delete_all
+  has_many :question_examples,
+           class_name: 'GekanatorQuestionExample',
+           dependent: :delete_all
 
   validates :answers, presence: true
   validates :question_count, numericality: { greater_than_or_equal_to: 0 }

backend/app/models/gekanator_question.rb

@@ -1,10 +1,11 @@
 class GekanatorQuestion < ApplicationRecord
-  KINDS = ['tag', 'source', 'title', 'original_date'].freeze
+  KINDS = ['tag', 'source', 'title', 'original_date', 'post_similarity'].freeze
   SOURCES = ['user_suggested', 'ai_generated', 'admin_curated'].freeze
-  STATUSES = ['pending', 'accepted', 'rejected'].freeze
+  STATUSES = ['pending', 'accepted', 'rejected', 'disabled'].freeze
 
   belongs_to :gekanator_question_suggestion, optional: true
   belongs_to :created_by, class_name: 'User', optional: true
+  has_many :gekanator_question_examples, dependent: :delete_all
 
   validates :kind, presence: true, inclusion: { in: KINDS }
   validates :source, presence: true, inclusion: { in: SOURCES }

backend/app/models/gekanator_question_example.rb

@@ -0,0 +1,17 @@
+class GekanatorQuestionExample < ApplicationRecord
+  ANSWERS = GekanatorQuestionSuggestion::ANSWERS
+  SOURCES = ['initial_suggestion', 'post_game_extra'].freeze
+
+  belongs_to :gekanator_question
+  belongs_to :post
+  belongs_to :user
+  belongs_to :gekanator_game, optional: true
+
+  validates :answer, presence: true, inclusion: { in: ANSWERS }
+  validates :source, presence: true, inclusion: { in: SOURCES }
+  validates :weight,
+            presence: true,
+            numericality: {
+              greater_than: 0
+            }
+end

backend/app/models/post.rb

@@ -21,6 +21,7 @@ class Post < ApplicationRecord
            foreign_key: :correct_post_id,
            dependent: :delete_all,
            inverse_of: :correct_post
+  has_many :gekanator_question_examples, dependent: :delete_all
 
   has_many :parent_post_implications,
            class_name: 'PostImplication',

backend/app/services/gekanator/question_suggestion_promoter.rb

@@ -0,0 +1,48 @@
+module Gekanator
+  class QuestionSuggestionPromoter
+    def self.call(...) = new(...).call
+
+    def initialize suggestion:, user:
+      @suggestion = suggestion
+      @user = user
+    end
+
+    def call
+      suggestion.with_lock do
+        return promoted_question if suggestion.processed?
+
+        question = GekanatorQuestion.create!(
+            text: suggestion.question_text,
+            kind: 'post_similarity',
+            source: 'user_suggested',
+            status: 'accepted',
+            priority_weight: 1.2,
+            condition: {
+              type: 'post-similarity',
+              postId: suggestion.gekanator_game.correct_post_id,
+              answer: suggestion.answer,
+              threshold: 0.65
+            },
+            gekanator_question_suggestion: suggestion,
+            created_by: user)
+        GekanatorQuestionExample.create!(
+            gekanator_question: question,
+            post: suggestion.gekanator_game.correct_post,
+            user: user,
+            gekanator_game: suggestion.gekanator_game,
+            answer: suggestion.answer,
+            source: 'initial_suggestion')
+        suggestion.update!(processed: true)
+        question
+      end
+    end
+
+    private
+
+    attr_reader :suggestion, :user
+
+    def promoted_question
+      suggestion.gekanator_questions.order(id: :desc).first
+    end
+  end
+end

backend/config/routes.rb

@@ -64,7 +64,12 @@ Rails.application.routes.draw do
   end
 
   namespace :gekanator do
-    resources :games, only: [:create], controller: '/gekanator_games'
+    resources :games, only: [:create], controller: '/gekanator_games' do
+      member do
+        get :extra_questions
+        post :extra_question_answers
+      end
+    end
     resources :posts, only: [:index], controller: '/gekanator_posts'
     resources :questions, only: [:index], controller: '/gekanator_questions'
     resources :question_suggestions,

backend/db/migrate/20260610000000_create_gekanator_question_examples.rb

@@ -0,0 +1,19 @@
+class CreateGekanatorQuestionExamples < ActiveRecord::Migration[8.0]
+  def change
+    create_table :gekanator_question_examples do |t|
+      t.references :gekanator_question, null: false, foreign_key: true
+      t.references :post, null: false, foreign_key: true
+      t.references :user, null: false, foreign_key: true
+      t.references :gekanator_game, null: true, foreign_key: true
+      t.string :answer, null: false
+      t.string :source, null: false, default: 'post_game_extra'
+      t.float :weight, null: false, default: 1.0
+      t.timestamps
+    end
+
+    add_index :gekanator_question_examples,
+              [:gekanator_question_id, :post_id, :user_id],
+              unique: true,
+              name: 'idx_gekanator_question_examples_on_question_post_user'
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_06_09_001000) do
+ActiveRecord::Schema[8.0].define(version: 2026_06_10_000000) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -75,6 +75,23 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_09_001000) do
     t.check_constraint "`question_count` >= 0", name: "chk_gekanator_games_question_count_nonnegative"
   end
 
+  create_table "gekanator_question_examples", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "gekanator_question_id", null: false
+    t.bigint "post_id", null: false
+    t.bigint "user_id", null: false
+    t.bigint "gekanator_game_id"
+    t.string "answer", null: false
+    t.string "source", default: "post_game_extra", null: false
+    t.float "weight", default: 1.0, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["gekanator_game_id"], name: "index_gekanator_question_examples_on_gekanator_game_id"
+    t.index ["gekanator_question_id", "post_id", "user_id"], name: "idx_gekanator_question_examples_on_question_post_user", unique: true
+    t.index ["gekanator_question_id"], name: "index_gekanator_question_examples_on_gekanator_question_id"
+    t.index ["post_id"], name: "index_gekanator_question_examples_on_post_id"
+    t.index ["user_id"], name: "index_gekanator_question_examples_on_user_id"
+  end
+
   create_table "gekanator_question_suggestions", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.bigint "gekanator_game_id", null: false
     t.bigint "user_id", null: false
@@ -553,6 +570,10 @@ ActiveRecord::Schema[8.0].define(version: 2026_06_09_001000) do
   add_foreign_key "gekanator_games", "posts", column: "correct_post_id"
   add_foreign_key "gekanator_games", "posts", column: "guessed_post_id"
   add_foreign_key "gekanator_games", "users"
+  add_foreign_key "gekanator_question_examples", "gekanator_games"
+  add_foreign_key "gekanator_question_examples", "gekanator_questions"
+  add_foreign_key "gekanator_question_examples", "posts"
+  add_foreign_key "gekanator_question_examples", "users"
   add_foreign_key "gekanator_question_suggestions", "gekanator_games", on_delete: :cascade
   add_foreign_key "gekanator_question_suggestions", "users"
   add_foreign_key "gekanator_questions", "gekanator_question_suggestions"