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How to optimize ActiveRecord in Ruby on Rails _ruby topics

performance-free because you do not need to make any connections to access multiple subclasses, ActiveRecord can use the Type column to determine which records can be returned. In some respects, ActiveRecord inheritance is very limited. If an existing inheritance level is very wide, inheritance is invalidated. For example, in Changingthepresent, there are many types of content, each with its own name, a short or long description, some common presentation properties, and several custom attribut

How to optimize ActiveRecord in Ruby on Rails: railsactiverecord

. Each type has its own name, short or long description, some common representation attributes, and several custom attributes. We hope that cause, nonprofit, gift, member, drive, registry, and other types of objects can be inherited from the general base class, so that we can process all types of content in the same way. But we cannot, because the Rails Model will have the essence of all our object models in a single table, which is not a feasible sol

A brief history of Linux development

until Linux appears. 9.1988 year: graphical interface XFree86 ProjectXFREE86: A nonprofit organization that develops user graphics interfaces, i.e. x Window System + FREE + x86 abbreviation• Increased demand for user graphics interfaces;· MIT has worked with third parties in 1984 to develop the X Window System;· MIT founded the nonprofit organization XFree86 in 1988. 10.1991: A message from Dut

One of the Linux learning-from the stories of three important people and a mind guide

only used Storman a person at that time;• Storman adopts the strategy of "first developing software on UNIX operating system", which is called GNU Software;• Developed Emacs: Program editor (not compiler), to check the program syntax;• To develop a compiler program under UNIX (very important), Storman uses Emacs to sell earned money and set up the FSF;· The FSF invites more engineers and volunteers to write software;• Key software developed: Compiler for GCC,C language8.1985-Year: GNU General P

Google ranks first among the most ideal employers for college students

students.The survey also found that students are not as fond of the pharmaceutical and consumer goods industries as they used to be. For example, in the past, the top 10 Johnson Johnson companies in the rankings fell from 8th to 18, while the Abbott lab slipped from 54th to more. At the same time, companies in the consumer goods field also began to decline, such as P G (down from 14 to 21) and L'Oreal (down from 27 to 35 ).According to statistics, the number of students involved in the su

[Linux distributions] Common Linux system downloads (RPM)

building a nonprofit management organization to manage the community, Mageia, a branch of Mandriva Linux in September 2010, created by former employees and contributors from France's popular Linux distribution. Unlike the Mandriva business entity, the Mageia program is a community project and a nonprofit organization whose goal is to develop a free Linux-based operating system. Official website: h

XML Easy Learning Handbook (vi): XML-related resource _xml/rss

, we can write DTDs by hand, but now there are some schema editing software to help us create DTDs more easily. Http://www.extensibility.com/Extensibility This software is called XML Authority. Schemas can be created and edited graphically, including DTD files. Nine. The domestic XML Resources Http://www.xml.net.cn/XML China Forum is a nonprofit academic website. by Peking UniversityFounded by the Institute of Computer Science and technology, the foun

20 Hot Issues in XML

Resource Definition Format (RDF), the CDF proposal was recently handed over to the consortium to exploit the capabilities of RDF to show the links between different data elements. Open Software Description is a glossary for describing software parts, with syntax such as dependencies, versions, and platforms. The OSD describes how to represent the characteristics of a part and how to install the part on your computer. It can be used to download a complete package, but it is primarily designed f

400+ free resources for Devops and system administrators

Placekitten.com Placepenguin.com Embed.ly Backhub.co Otixo.com Tinypng.com Filestack.com Other resources Github.com–foss for DevGithub.com–free for nonprofit –list of Free services for nonprofit organizations Getawesomeness–retrieve all amazing awesomeness from GitHub ... a must see Education.github.com–collection of free services for students. Registratio

Case interview in point-the only way to consult-2

China Championship and world runner-up in the previous two sessions), shell gourami Business Challenge, ja Global Business Challenge, and entrepreneurship program competition, exhibition planning competition, Financial Analysis Competition, bertelman media inside, hpair, Stanford Asian tech entrepreneurship activities and so on. another advantage of participating in extra-curricular activities is that it helps you build your own connections and expand the network for future use. 5. Community

The ten most widely used Linux distributions

. MageiaMageia is a gnu/linux-based computer operating system and free software for everyone to use. The hero behind the development of this release is the group of employees who developed the Mandriva Linux for the French company. The first version was released in September 2010. The second version came into existence in May 2012. The Mageia includes Gnome 3.4, KDE4 SC 4.8.2, LXDE, XFCE 4.9, RAZOR-QT, and E17. It is very stable and reliable, hardware requirements are not high, on the very weak

Linux distributions • Common Linux system downloads

-known Linux distribution and is a fast, stable and powerful operating system for everyday applications built by community enthusiasts around the world. It allows anyone to use, modify, and redistribute freely, both now and in the future. It is developed by a strong community of members who, with their tireless efforts, provide and maintain free, open-source software and open standards.Official website: http://fedoraproject.org/: Http://fedoraproject.org/zh_CN/get-fedoraMageiaSystem: LinuxBased

< a > What Linux is

established in 1988.3. Development of Linux:① 1991, Finnish University student Linustorvalds claimed that he wrote a small core program that could operate on Intel's 386 machine, making many people feel interesting, and began the extraordinary journey of Linux!② Virtual Team Generation: a single personal maintenance stage à the vast number of hackers volunteers to join the stage à core functions of the Division of the development stage of detail. The development of the Linux personnel each oth

18 command-line tools to monitor Linux performance [GO]

ARP attacks on a network.For more information, see: Arpwatch to Monitor Ethernet Activitysuricata– Network Security MonitoringSuricata is an open source high-performance network security, intrusion detection and anti-monitoring tool that can run on Linux, FreeBSD, and Windows. Nonprofit organization OISF (Open Information Security Foundation) develops and owns its copyrights.For more information, see: Suricata–a Network intrusion Detection and preven

Performance Test Training: 18 commands and tools to help you locate Linux performance issues

designed to monitor Ethernet address resolution (changes in Mac and IP addresses) on Linux. He continuously monitors Ethernet activity for a period of time and outputs a log of changes in IP and MAC address pairs. It can also send an email notification to an administrator, alerting you to an increase in address pairing. This is useful for detecting ARP attacks on a network.suricata– Network Security MonitoringSuricata is an open source high-performance network security, intrusion detection and

18 command-line tools for Linux performance monitoring

Mac and IP addresses) on Linux. He continuously monitors Ethernet activity for a period of time and outputs a log of changes in IP and MAC address pairs. It can also send an email notification to an administrator, alerting you to an increase in address pairing. This is useful for detecting ARP attacks on a network.For more information, see: Arpwatch to Monitor Ethernet Activitysuricata– Network Security MonitoringSuricata is an open source high-performance network security, intrusion detection

The fundamental difference between FreeBSD and Linux 10

The logo of Linux is a very cute little penguin, and FreeBSD's logo is a small demon with a fork. Do you often hear people confuse Linux and BSD systems? Yes, I sometimes hear a lot of newbies, even the media say so. Of course, there are actually a lot of similarities between the two, for example, they are all based on Unix, and basically both of these systems are developed by nonprofit organizations and teams, and I would like to say that both system

25 Excellent website recommendations that make you more intelligent and powerful

, health, spirit, efficiency and other fields, is a rare platform for this era. Wikiwand Wikiwand is a truly professional Wikipedia reader, both on the desktop and on the mobile side are very good. TED TED is dedicated to the promotion of truly meaningful, valuable ideas of nonprofit organizations, those inspirational films, the Brain Hole open topic, here to see. Digital Photography School Digital photography requires professional skills and cr

Internet history, Technology and Security (Week 2)

communications facility. His design is not 56,000-bit, but begins with 1.5 megabits. It was not long before TCP/IP was present, and the proposal received suspicions from the National Science Foundation of the United States. But traffic explains everything (this network is growing in the form of explosions!) ), thanks to the TCP/IP protocol.They then entered the next phase, DS3, with a 30 times-fold increase in network design (compared to 1.5 megabits), which reached 45 megabits. They created an

Introduction to "Go" Apache Open source project

The Jakarta project is part of the ASF (the Apache software Foundation). ASF is a nonprofit organization that encourages collaborative, pragmatic development based on open software licensing, and provides high-quality software in all areas, involving HTTP servers, compilation tools, class libraries, development architectures, server-side Java technology, EE containers, database Tools, log tools, XML parsing and many other fields. Some of the Java proj

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