Recipe

路线数据库MongoDB

Referenced documents VS Subdocuments

parentDoc.childDocA.name = 'xxx'; // childDocA is a subdocument
parentDoc.childDocB.name = 'yyy'; // childDocB is a referenced document
parentDoc.save(); // Does not save referenced document(childDocB) but save childDocA

Reconfig Replica set

如果复制集所在的电脑IP更改了，例如从 192.168.1.15 变为了 192.168.1.101，那么需要重新配置复制集：

mongosh --port 28017

# in mongosh
use admin
db.auth("admin")
...
var cfg = rs.conf()
cfg.members[0].host = "192.168.1.101:28017"
rs.reconfig(cfg)