参考
https://stackoverflow.com/questions/1543171/how-can-i-output-leading-zeros-in-ruby
"%010d" % 223
0000000223
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: ...
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