All basic question types

app/controllers/questions_controller.rb

@@ -0,0 +1,23 @@
+class QuestionsController < ApplicationController
+  def answer
+    question = Question.find(params[:id])
+    @answer = Answer.find_or_initialize_by(question:)
+
+    send(:"handle_#{question.answer_kind}_answer")
+  end
+
+  private
+
+  def handle_simple_answer
+    @answer.update!(data: params[:value])
+  end
+
+  def handle_image_answer
+    @answer.image.attach(
+      io: StringIO.new(Base64.decode64(params[:data])),
+      filename: params[:filename],
+      content_type: params[:mimetype],
+    )
+    @answer.save!
+  end
+end