add mutations to questions and reviews

app/graphql/mutations/finish_question.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module Mutations
+  class FinishQuestion < BaseMutation
+    field :question, Types::QuestionType, null: true
+
+    argument :question_id, ID, required: true
+
+    def resolve(input)
+      user = context[:current_user]
+
+      question = ::Question.find(input[:question_id])
+
+      raise Pundit::NotAuthorizedError unless QuestionPolicy.new(user, question).finish?
+
+      if question.update(status: :registered)
+        { question: question, errors: [] }
+      else
+        { question: nil, errors: question.errors.full_messages }
+      end
+
+    rescue Pundit::NotAuthorizedError => e
+      { question: nil, errors: [e.message] }
+    end
+  end
+end