memory: 放在EVM内存中
storage: 持久化在 block上
所以到时候查询一下放在那里合适。
contract的constructor中的参数都是memory
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: ...
Blockchain Solidity Modifier的使用underscore
Cloudflare Dns 使用nginx Cloudflare 创建无需配置的ssl Https
