#41

backend/app/controllers/gekanator_games_controller.rb

@@ -0,0 +1,17 @@
+class GekanatorGamesController < ApplicationController
+  def create
+    return head :unauthorized unless current_user
+
+    answers = params.require(:answers).as_json
+
+    game = GekanatorGame.create!(
+        user: current_user,
+        guessed_post_id: params.require(:guessed_post_id),
+        correct_post_id: params[:correct_post_id].presence,
+        won: bool?(:won),
+        question_count: params.require(:question_count),
+        answers:)
+
+    render json: { id: game.id }, status: :created
+  end
+end

backend/app/models/gekanator_game.rb

@@ -0,0 +1,18 @@
+class GekanatorGame < ApplicationRecord
+  belongs_to :user, optional: true
+  belongs_to :guessed_post, class_name: 'Post'
+  belongs_to :correct_post, class_name: 'Post', optional: true
+
+  validates :answers, presence: true
+  validates :question_count, numericality: { greater_than_or_equal_to: 0 }
+  validates :won, inclusion: { in: [true, false] }
+  validate :correct_post_required_when_lost
+
+  private
+
+  def correct_post_required_when_lost
+    return if won || correct_post_id.present?
+
+    errors.add(:correct_post_id, '外れた時は正解の投稿を指定してくださぃ．')
+  end
+end

backend/app/models/post.rb

@@ -11,6 +11,16 @@ class Post < ApplicationRecord
   has_many :user_post_views, dependent: :delete_all
   has_many :post_similarities, dependent: :delete_all
   has_many :post_versions
+  has_many :gekanator_guessed_games,
+           class_name: 'GekanatorGame',
+           foreign_key: :guessed_post_id,
+           dependent: :delete_all,
+           inverse_of: :guessed_post
+  has_many :gekanator_correct_games,
+           class_name: 'GekanatorGame',
+           foreign_key: :correct_post_id,
+           dependent: :nullify,
+           inverse_of: :correct_post
 
   has_many :parent_post_implications,
            class_name: 'PostImplication',