refer to:  https://stackoverflow.com/questions/45347317/which-one-is-faster-between-map-collect-select-and-pluck pluck:  pick 1 attribute from array map: re-implement your function my_ar...

例子，如果某个model对应的factory定义为： factory  :tx do   blockend block为一个独立的model,  tx belongs_to block 那么，在创建的该tx的时候，我们应该： create :tx, block: Block.new 不应该这样调用:   create :tx, bl...

refer to: https://stackoverflow.com/questions/22464011/mysql2error-incorrect-string-value 1. change your  database.yml: development: adapter: mysql2 database: db username: password: ...

refer to: https://www.thegeekdiary.com/mysql-error-too-many-connections-and-how-to-resolve-it/ This error is caused by mysql, but not rails config. check variable: max_connections: SHOW VARIAB...

1. 无法根据redis来准确删除某个任务，隐藏的特别深，只能使用flushall 2. 网上的策略都不好使，例如： https://stackoverflow.com/questions/25889699/sidekiq-stop-one-single-running-job https://stackoverflow.com/questions/48348723/sidekiq-lis...

refer to :  https://stackoverflow.com/questions/4695563/upsert-in-rails-activerecord https://stackoverflow.com/questions/58759765/how-does-the-upsert-function-in-rails-work https://apidock....

refer to: https://github.com/vinsol-spree-contrib/spree_themes/issues/26 issue description Mysql2::Error: Data too long for column 'nmap_result' at row 1 (ActiveRecord::ValueTooLong) from /home/...

连接Postgre数据库时报ERROR:column "proisagg" dose not exist 需要升级pgadmin了. 非常奇怪 refer to:  https://blog.csdn.net/weixin_44671994/article/details/87935656 我的pg_admin是3.x 的.需要升级了.

refer to:  https://gist.github.com/ankurk91/c4f0e23d76ef868b139f3c28bde057fc  https://www.linuxjournal.com/content/signing-git-commits 1. 创建一个新的gpg:  # Ubuntusudo apt-get install gpa...

单元测试，一个不断被强调，但又不断被忽略的话题，从一名码农成长为一名优秀的工程师，单元测试，是必不可少的技能。单元测试是在所有测试环节中最先完成的，在我们写代码的过程中就需要写单元测试，也可能在未写代码前先写测试。个人认为编码能力，代码评审和单元测试是一个研发同学必备的三大重要技能。 Go常用测试框架 框架名称特征优点缺点备注Testingtable-driver测试支持基准测试Go原生简...