**やりたいこと**  
自作アプリ内に追加したcreated_atのようなdatetime型のカラムに値を入れたいのですが、うまいこと行きません。

**現状**  
deviseを用いたユーザー登録の仕様で、いくつか追加したカラムがあります。その中で、”received_at”というカラムがあるのですが、その第1段階で、ユーザー作成の際にその時点での時間を入れたいのですがうまくいきません。下にコードを書くのでどこがいけないのか教えていただきたいです。

**Users_controller.rb**

```

    class UserController < xxx
      before_action :authentificate_user!
      def create
        @user = User.new(user_params)
        @user.received_at = Time.now
        if @user.save
          @user.send_activation_email
          flash[:info] = "Please check your email to activate your account."
          redirect_to root_url, notice: "Please check your email to activate your account."
        else
          render 'new'
        end
      end
    end
    
```

大雑把に言うとこういう書き方をしているのですが、この `@user.received_at = Time.now`
の箇所でイメージとしては、created_atのようにその時点での時刻を入れたいのですが、コマンドプロンプトで確認すると、ユーザー作成なんかは出来ているのですが、`received_at
= nil` になってしまいます。

何か良いアドバイスが有れば、よろしくお願いします。

**schema.rb**

```

    create_table "users", force: :cascade do |t|
        t.string "email", default: "", null: false
        t.string "encrypted_password", default: "", null: false
        t.string "reset_password_token"
        t.datetime "reset_password_sent_at"
        t.datetime "remember_created_at"
        t.integer "sign_in_count", default: 0, null: false
        t.datetime "current_sign_in_at"
        t.datetime "last_sign_in_at"
        t.string "current_sign_in_ip"
        t.string "last_sign_in_ip"
        t.string "confirmation_token"
        t.datetime "confirmed_at"
        t.datetime "confirmation_sent_at"
        t.string "unconfirmed_email"
        t.integer "failed_attempts", default: 0, null: false
        t.string "unlock_token"
        t.datetime "locked_at"
        t.datetime "created_at", null: false
        t.datetime "updated_at", null: false
        t.string "name"
        t.date "birthday"
        t.datetime "received_at"
        t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
        t.index ["email"], name: "index_users_on_email", unique: true
        t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
        t.index ["unlock_token"], name: "index_users_on_unlock_token", unique: true
    end
    
```

deviseの基本的なものがほとんどですが、いくつかカラムを追加しています。

追記２

**ユーザー登録時のコマンドプロンプト**

この最後の `received=at =nil` が気になってます。

```

    Started POST "/users" for ::1 at 2022-05-23 20:55:00 +0900
    Processing by Devise::RegistrationsController#create as HTML
      Parameters: {"authenticity_token"=>"[FILTERED]", "user"=>{"name"=>"ささ", "birthday"=>"2022-05-03", "email"=>"xxxxxxx", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}, "commit"=>"アカウント登録"}
      TRANSACTION (0.1ms)  BEGIN
      User Exists? (0.7ms)  SELECT 1 AS one FROM "users" WHERE "users"."email" = $1 LIMIT $2  [["email", "xxxxxxx"], ["LIMIT", 1]]
      User Create (0.8ms)  INSERT INTO "users" ("email", "encrypted_password", "reset_password_token", "reset_password_sent_at", "remember_created_at", "sign_in_count", "current_sign_in_at", "last_sign_in_at", "current_sign_in_ip", "last_sign_in_ip", "confirmation_token", "confirmed_at", "confirmation_sent_at", "unconfirmed_email", "failed_attempts", "unlock_token", "locked_at", "created_at", "updated_at", "name", "birthday", "received_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22) RETURNING "id"  [["email", "xxxxxxx"], ["encrypted_password", "[FILTERED]"], ["reset_password_token", "[FILTERED]"], ["reset_password_sent_at", "[FILTERED]"], ["remember_created_at", nil], ["sign_in_count", 0], ["current_sign_in_at", nil], ["last_sign_in_at", nil], ["current_sign_in_ip", nil], ["last_sign_in_ip", nil], ["confirmation_token", "[FILTERED]"], ["confirmed_at", nil], ["confirmation_sent_at", "2022-05-23 20:55:00.331651"], ["unconfirmed_email", nil], ["failed_attempts", 0], ["unlock_token", "[FILTERED]"], ["locked_at", nil], ["created_at", "2022-05-23 20:55:00.331554"], ["updated_at", "2022-05-23 20:55:00.331554"], ["name", "ささ"], ["birthday", "2022-05-03"], ["received_at", nil]]
    
```
CC BY-SA 4.0
2022-05-31T07:52:46.880
89161
2022-06-05T12:42:14.380
2022-06-05T12:42:14.380
40091
40091
question
ruby-on-rails ruby
Rubyでcreated_atのようなdatetime型自作カラムに時刻を値として入れたいです