Rails 4中未定义的方法update_attributes [英] undefined method update_attributes in Rails 4
问题描述
我现在正在使用Rails 4 现在我想更新我的用户记录 我正在尝试使用此命令
i'm now using Rails 4 now i want to update my user record i'm trying to use this command
@user=User.update_attributes(:name=> params[:name], :user=> params[:username], :pass=> params[:password])
OR
@user=User.update_attributes(name: params[:name], user: params[:username], pass: params[:password])
但总是出现错误
undefined method `update_attributes'
那么我如何更新我的用户 我也想问一问,它将更新我数据库中的所有用户吗?
so how i can update my user also i want to ask is it will update all the users in my DB ??
我认为我必须添加诸如where id=@user.id
之类的条件,但是我不知道该如何在Rails中做到这一点!!!
i think i must add some condition such as where id=@user.id
but i don't know how i can do that in rails !!!
推荐答案
update_attributes
是实例方法,而不是类方法,因此首先需要在User
类的实例上调用它.
update_attributes
is an instance method not a class method, so first thing you need to call it on an instance of User
class.
获取要更新的用户: 例如假设您要更新ID为1的用户
Get the user you want to update : e.g. Say you want to update a User with id 1
@user = User.find_by(id: 1)
now if you want to update the user's name and password, you can do
两个
@user.update(name: "ABC", pass: "12345678")
或
@user.update_attributes(name: "ABC", pass: "12345678")
在您的情况下相应地使用它.
Use it accordingly in your case.
有关更多参考,您可以参考 Ruby on Rails指南.
For more reference you can refer to Ruby on Rails Guides.
您可以使用update_all
方法来更新所有记录.
这是一个类方法,因此您可以将其称为
以下代码将更新所有用户记录的名称并将其设置为"ABC"
User.update_all(name:"ABC")
You can use update_all
method for updating all records.
It is a class method so you can call it as
Following code will update name of all User records and set it to "ABC"
User.update_all(name: "ABC")
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