Rails find_or_create_by : 查找具有给定属性的第一条记录，或创建一条记录def find_or_create_by(attributes, &block) find_by(attributes) || create(attributes, &block) end但请注意，此方法不是原子方法，不...
XanderCheung
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比如 sh install.sh 执行过程中需要键盘输入 :Enter，yes，Enter，yesRUN sh -c '/bin/echo -e "\nyes\n\nyes" | sh install.sh'
XanderCheung
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用docker 构建elasticsearch时， 加入 elasticsearch-analysis-ik 分词，但是构建不成功，@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ WARNING: plugin requires additional permissions @@@@@@@@@@@@@@...
XanderCheung
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chrome中非https无法打开摄像头MediaDevices .getUserMedia()方法提示用户使用媒体输入的权限，该输入会产生MediaStream并包含包含请求的媒体类型的轨道. 该流可以包括，例如，视频轨道（由...
XanderCheung
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原文：Learn Vim Progressively1st Level – Survivei → Insert mode. Type ESC to return to Normal mode.x → Delete the char under the cursor:wq → Save and Quit (:w save, :q quit)dd → Delete (and copy) the current linep ...
XanderCheung
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Manjaro 启动vmware中虚拟机失败：Unable to install module vmware-workstation/15.1.0_13591040 for kernel 5.3.15-1-MANJARO: Missing kernel headers.Missing kernel headers1.根据系统的内核安装 linux-headersuname -r => 5.3.15-1-...
XanderCheung
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本文概要：git 工作流git 常用操作命令git merge VS git rebase回退版本 git reset VS git revert1.工作流：核心：（1）任何新的功能（feature）或 bug 修复全都新建一个 branch 来写（2）branch 写完后...
XanderCheung
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TL;DR: run gem update --system.What is this bug?Some versions of RubyGems try to use the exact version of Bundler listed in your Gemfile.lock anytime you run the bundle command. If you are using one of those versions of RubyGems, but do no...
XanderCheung
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WARNING: Error loading config file: /home/$USER/.docker/config.json: open /home/$USER/.docker/config.json: permission deniedTry this:sudo chown $USER:docker ~/.docker sudo chown $USER:docker ~/.docker/config.json sudo chmod g+rw ~/.docker/c...
XanderCheung
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To clear containers:docker rm -f $(docker ps -a -q)To clear images:docker rmi -f $(docker images -a -q)To clear volumes:docker volume rm $(docker volume ls -q)To clear networks:docker network rm $(docker network ls | tail -n+2 | awk '{if($2...
XanderCheung
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客户端预编译的压缩包可以在如下几个站点找到：Github Release: github.com/v2ray/v2ray-coreGithub 分流: github.com/v2ray/distHomebrew: github.com/v2ray/homebrew-v2rayArch Linux: packages/community/x86_64/v2ray/Snapcr...
XanderCheung
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查看开发的端口firewall-cmd --list-ports开放端口 10235firewall-cmd --zone=public --add-port=10235/tcp --permanent 重启firewall firewall-cmd --reload
XanderCheung
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回滚特定文件：rake db:migrate:down VERSION=20170726090222要查找所有迁移的版本，可以使用以下命令：rake db:migrate:statusdatabase: iotboss_08_09_b1 Status Migration ID Migration Name-----------------------...
XanderCheung
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经历了一个夏天今天我们一起来揭晓答案是凤鸣九洲，一飞冲天还是御剑夺魁，沐浴金雨下午16:00终局一战2019英雄联盟职业联赛夏季总决赛
撸猫铁头娃
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清除坏的<none>:<none>镜像docker rmi $(docker images -f "dangling=true" -q)
XanderCheung
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宿主机已经运行mysql在3306端口，这个时候 映射容器中的 mysql '3306:3306' 就会和外部冲突，这个时候 映射 3308 到容器mysql的3306CONTAINER ID IMAGE COMMAND ...
XanderCheung
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Doinb等这一刻5年了。5年前初登赛场，一手维克托名扬天下，可英雄池的属性让他饱受争议，到现在还有人提起。4年前Doinb所在的QG2比3不敌LGD，没人想到这居然是Doinb离全球总决赛最...
撸猫铁头娃
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在刚刚结束的LPL夏季赛半决赛当中，RNG以3-1的比分击败TES成功挺进决赛。凭借春季赛拿到的10积分以及进入夏季赛决赛至少能够获得的90积分，RNG以保底100分的积分优势，成为继FPX之...
撸猫铁头娃
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https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors
XanderCheung
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一、技术栈基于 es6、vue、vuex、vue-router 、vue-cli 、axios 和 element-ui，(请求数据使用Mock.js进行模拟)Vue 生态圈Vue Router 是 vue 官方的路由。它能快速的帮助你构建一个单页面或者多页面...
XanderCheung
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SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='数据库名' AND pid<>pg_backend_pid();
XanderCheung
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Note - The full source code for this tutorial can be found here: TutorialEdge/go-jwt-tutorialJWTs, or JSON Web Tokens as they are more formally known, are a compact, URL-safe means of representing claims to be transferred between two part...
XanderCheung
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JavaScript Frontend frameworks have undoubtedly helped to push the boundaries of what was previously possible in the context of a browser. Ever more complex applications have come out built on top of the likes of React, Angular and VueJS to...
XanderCheung
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So, I recently partook in Hacktoberfest which is an event that helps to support thousands of different Open Source projects. Usually, I tend to get caught up in other projects or can't find the time or make up a hundred other excuses for ...
XanderCheung
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ObjectivesBy the end of this tutorial, you will be able to...Encrypt text using the AES - Advanced Encryption Standard in GoWe'll then look at writing this encrypted message to a fileFinally we'll look at how we can decrypt this message usi...
XanderCheung
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The whole area of Face Recognition is something I love reading about. Implementing a facial recognition system yourself makes you sound like you are Tony Stark and you can use them for a variety of different projects such as an automatic lo...
XanderCheung
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Welcome fellow coders! In this tutorial, we are going to be taking a look at how you can implement your own OAuth2 Server and client using the go-oauth2/oauth2 package.This is without a doubt one of the most requested topics from commento...
XanderCheung
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