version: rails4
在你模型的生命周期内,Active Record 的回调函数允许你对于特定的事件增加代码。当那些事件发生的时候,这使得你能够对于你的模型增加行为,只要直接产生代码即可,就如同当你创建一个新的记录时,修改它,销毁它等等。你可以了解到回调函数的更多知识,可以参考 Active Record Callbacks guide.
original: http://guides.rubyonrails.org/active_record_basics.html#callbacks
相关推荐
ffmpeg basics ffmpeg basics ffmpeg basics ffmpeg basics ffmpeg basics
And almost all of those books actually do a great job of introducing you to the basics of Active Record; they go a long way toward getting you started with the library. However, because they ...
MPLS BasicsMPLS Basics
FFmpeg Basics
Python Basics with Numpy Python Basics with Numpy Python Basics with Numpy
Stepper Motor Basics
工业机器人-S7 Array and Indirect Addressing Examples and Basics.7z
FFmpeg Basics = 119.pdf
LabWindows CVI BASICS I & II 英文版的都是
The Basics of Cloud Computing
Blockchain Basics A Non-Technical Introduction in 25 Steps 英文epub 本资源转载自网络,如有侵权,请联系上传者或csdn删除 本资源转载自网络,如有侵权,请联系上传者或csdn删除
[Gradle.Beyond.the.Basics(2013.7)].Tim.Berglund.文字版
Welcome to HTML Basics. This workshop leads you through the basics of Hyper Text Markup Language (HTML). HTML is the building block for web pages. You will learn to use HTML to author an HTML page to ...
Basics of Holography.pdf
Basics of CMOS Cell Design
LabVIEWTM Basics I: Introduction Course Manual (498页)
clojure-basics-源码.rar
Gradle Beyond the Basics
RF Basics_AN5300 describe some rf basic concept
英语原版 MSP430 Microcontroller Basics.pdf