Ars*_*Ali 8 ruby database ruby-on-rails rails-activerecord
可以使用column_names获取表的所有列,但如果想知道ActiveRecord中特定实例的所有值,该怎么办？
例如,
User.column_names
=> ["id", "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", "tel", "interests", "admin_status", "created_at", "updated_at", "city_id", "profile_image_file_name", "profile_image_content_type", "profile_image_file_size", "profile_image_updated_at"]
User.first
=> #<User id: 1, email: "aatir@jpl.com", tel: "+923223333333", interests: "Hi, I'm interested in coding.", admin_status: "download", created_at: "2016-08-16 22:38:05", updated_at: "2016-08-16 22:38:05", city_id: 2, profile_image_file_name: "Screen_Shot_2016-07-02_at_4.41.32_PM.png", profile_image_content_type: "image/png", profile_image_file_size: 324372, profile_image_updated_at: "2016-08-16 22:38:04">
当first方法被调用,它返回键-值对.我想要的是只有值,ActiveRecord中有一个方法可以为我们做这个吗？
Dee*_*ale 10
您也可以使用attributes方法来获取它
User.first.attributes.values
User.first.attributes将返回user对象的哈希表示
User.first.attributes
{
"id" => 1,
"email" => "aatir@jpl.com",
"tel" => "+923223333333",
"interests" => "Hi, I'm interested in coding.",
"admin_status" => "download",
"created_at" => "2016-08-16 22:38:05",
"updated_at" => "2016-08-16 22:38:05",
"city_id" => 2,
"profile_image_file_name" => "Screen_Shot_2016-07-02_at_4.41.32_PM.png",
"profile_image_content_type" => "image/png",
"profile_image_file_size" => 324372,
"profile_image_updated_at" => "2016-08-16 22:38:04"
}
values 将返回你的值 Array
User.first.attributes.values
[1, "aatir@jpl.com", "+923223333333", "Hi, I'm interested in coding.", "download", "2016-08-16 22:38:05", "2016-08-16 22:38:05", 2, "Screen_Shot_2016-07-02_at_4.41.32_PM.png", "image/png", 324372, "2016-08-16 22:38:04"]
我正在扩展@deepak的答案，以确保顺序与 的顺序保持相同column_names，这就是我实现它的方式：
User.first.attributes.values_at *User.column_names
要仅获取值，而不考虑顺序：
User.first.attributes.values