Rails:#update_attribute与#update_attributes [英] Rails: #update_attribute vs #update_attributes

问题描述

obj.update_attribute(:only_one_field, 'Some Value')
obj.update_attributes(field1: 'value', field2: 'value2', field3: 'value3')

这两种方法都将更新对象，而不必明确告诉ActiveRecord更新.

Both of these will update an object without having to explicitly tell ActiveRecord to update.

Rails API说:

Rails API says:

update_attribute

update_attribute

更新单个属性并保存记录，而无需执行正常的验证过程.这对于现有记录上的布尔标志特别有用.混入验证模块时，Base中的常规update_attribute方法被替换为默认方法.

Updates a single attribute and saves the record without going through the normal validation procedure. This is especially useful for boolean flags on existing records. The regular update_attribute method in Base is replaced with this when the validations module is mixed in, which it is by default.

update_attributes

update_attributes

更新传入的哈希中的所有属性并保存记录.如果对象无效，则保存将失败并返回false.

Updates all the attributes from the passed-in Hash and saves the record. If the object is invalid, the saving will fail and false will be returned.

因此，如果我不想验证对象，则应使用 #update_attribute .如果我在 #before_save 上进行了更新，会堆栈溢出吗?

So if I don't want to have the object validated I should use #update_attribute. What if I have this update on a #before_save, will it stackoverflow?

我的问题是 #update_attribute 是否也绕过了保存之前或只是进行了验证.

My question is does #update_attribute also bypass the before save or just the validation.

此外，将哈希传递给 #update_attributes 的正确语法是什么……请在顶部查看我的示例.

Also, what is the correct syntax to pass a hash to #update_attributes ... check out my example at the top.

推荐答案

请参考 update_attribute .单击显示源后，您将获得以下代码

Please refer to update_attribute. On clicking show source you will get following code

      # File vendor/rails/activerecord/lib/active_record/base.rb, line 2614
2614:       def update_attribute(name, value)
2615:         send(name.to_s + '=', value)
2616:         save(false)
2617:       end

，现在引用 update_attributes 和看看你得到的代码

and now refer update_attributes and look at its code you get

      # File vendor/rails/activerecord/lib/active_record/base.rb, line 2621
2621:       def update_attributes(attributes)
2622:         self.attributes = attributes
2623:         save
2624:       end

两者之间的区别是 update_attribute 使用 save(false) ，而 update_attributes 使用

the difference between two is update_attribute uses save(false) whereas update_attributes uses save or you can say save(true).

很抱歉，我的发言很重要，但我想说的很重要.如果 保存(perform_validation = true) > perform_validation 为假，它将绕过所有验证与 save 相关.

Sorry for the long description but what I want to say is important. save(perform_validation = true), if perform_validation is false it bypasses (skips will be the proper word) all the validations associated with save.

第二个问题

此外，将哈希传递给update_attributes的正确语法是什么?请在顶部查看我的示例.

Also, what is the correct syntax to pass a hash to update_attributes... check out my example at the top.

您的示例是正确的.

Object.update_attributes(:field1 => "value", :field2 => "value2", :field3 => "value3")

或

Object.update_attributes :field1 => "value", :field2 => "value2", :field3 => "value3"

，或者如果您获取所有字段数据&哈希名称说 params [:user] 在这里仅使用

or if you get all fields data & name in a hash say params[:user] here use just

Object.update_attributes(params[:user])

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