Go代码无法编译：未定义：revel.EmptyPlugin

Question

Me and a few friends are writing a server using golang (revel) and had a database implemented just a few weeks ago. Then suddenly everything just stopped working and the go compiler can't find my import files. That includes EmptyPlugin as well as RegisterPlugin.

We are all pretty new so this is probably a pretty simple fix. I have checked my github.com/robfig/revel folder, and there is no file called EmptyPlugin. But that is probably a misunderstanding from my side :P.

By commenting the lines revel.EmptyPlugin and revel.RegisterPlugin(DbPlugin{}) everything works as it should.

package controllers

import (
    "database/sql"
    "fmt"
    _ "github.com/bmizerany/pq"
    "github.com/robfig/revel"
    "log"
    "time"
    //"strconv"
)

type DbPlugin struct {
    revel.EmptyPlugin
}



func init() {
    revel.RegisterPlugin(DbPlugin{})
}


var db *sql.DB 
var err error

Answer 1

You appear to compiling using the latest and recently updated version of Revel: https://github.com/robfig/revel.

However, it appears that your code was written for this older version of Revel: https://github.com/robfig/revel/tree/dev.

Update your code to the latest version of Revel.