私は更新方法を使用できない理由は何ですか？

Question

更新方法は動作しないようだと、私は下のエラーが表示されます。私はコースのモデルとレッスンのモデルを持っている

Started PATCH "/lessons/4" for 127.0.0.1 at 2017-07-20 11:23:27 +0900 
Processing by LessonsController#update as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"+95AUkvSbAUfVzAp9xweeiuq8IKq3gdqJB5oP8HoRP3NvkoYHkGRYe1TQSMxVtTZGPlATx6ltb0SThD6ifMXpg==", "lesson"=>{"title"=>"まずはじめに", "content"=>"Jelly beans chupa chups soufflé toffee cookie croissant sugar plum cookie. Danish caramels gummi bears marzipan apple pie cupcake jelly pudding dragée. Jelly-o pastry halvah sweet. Pudding jujubes marshmallow pie soufflé. Tart chocolate bar dragée bonbon cotton candy jelly beans chupa chups. Cheesecake tart chupa chups candy canes sweet roll biscuit candy lollipop. Chupa chups lemon drops chocolate bear claw muffin tiramisu pastry marzipan ice cream. Sweet candy canes danish halvah caramels cupcake donut lemon drops gummi bears."}, "commit"=>"更新", "id"=>"4"} 
    Lesson Load (0.1ms) SELECT "lessons".* FROM "lessons" WHERE "lessons"."id" = ? LIMIT ? [["id", 4], ["LIMIT", 1]] 
    User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ? [["id", 1], ["LIMIT", 1]] 
No template found for LessonsController#update, rendering head :no_content 
Completed 204 No Content in 112ms (ActiveRecord: 0.3ms) 

と私はなく、レッスンのための私のコースモデルの更新方法を使用することができていますモデル...

何か提案がありますか？

Answer 1

これは私のために働いて、それがDB

def update 
@lesson = Lesson.find(params[:id]) 
if @lesson.update(params) 
    redirect_to root_path, alert: "Your lesson is saved!" 
else 
    render 'edit', alert: "Oops! There was a problem, please try again" 
end 
end