关于c.value("tx").(*pop.connection)

var s = x.(T) //语法为golang的类型断言, 如果x不为nil,且可以转换为T类型,则断言成功,返回一个T类型的变量 s, 如果T为接口,则要求x实现T,如果断言失败 panic
c.valule() //获取context中的值,关于tx在下面 buffalo.context返回值中说明

结构体中定义文件上传

c.Bind(posts)//model中处理
type posts struct{MyFile binding.File `-`
}
//调用AfterCreate方法在创建后上传文件
func (p *posts) AfterCreate(tx *pop.connection){if !p.MyFile.Valid() {return nil}dir := filepath.Join(".","uploads")if err := os.MkdirAll(dir,0755);err != nil {return errors.WithStack(err)}f,err := os.Create(fileppaht.join(dir,w.MyFile.Filename))if err != nil{return errors.WithStack(err)}defer f.Close()_,err := io.Copy(f,w.MyFile)return err
}
//eg 
func (u *User) AfterSave(tx *pop.Connection) error {tokened := strings.Split(u.Image, "/")fileName := tokened[len(tokened)-1]output, err := os.Create(fileName)if err != nil {return err}defer output.Close()response, err := http.Get(u.Image)if err != nil {return err}defer response.Body.Close()n, err := io.Copy(output, response.Body)if err != nil {return err}
}
//action中处理
f,err := c.File("MyFile")
if err != nil {return ...
}
...

定义日志记录器

func JSONLogger(lvl logger.Level) logger.FieldLogger {f,err := os.OpenFile("./log.txt",os.O_RDWR|os.O_CREATE|os.O_APPEND, 0766)if err != nil {log.Fatal(err)}l := logrus.New()l.Level = lvll.SetFormatter(&logrus.JSONFormatter{})l.SetOutput(f)return logger.Logrus{FieldLogger: l}
}
app = buffalo.New(buffalo.Options{Env:         ENV,SessionName: "_cxy_session",Logger: JSONLogger(logger.DebugLevel),})

buffalo.context 返回值

type : map[string][][string]
return{app{name : addr :host :env :log_level :log_lvl :session_name :worker_off :prefix :},authenticity_token : ,contentType : ,current_path : ,current_route{method : ,path : ,handler : ,pathName : ,aliases : ,},env : ,languages{},method : ,request_id : ,routes{method : ,path : ,handler : ,pathName : ,aliases : ,},tx{"ID": "zxNdoFdzFJAZebIzibCdEewkPZDOpG","Store": {"ID": 4641137705029448206,"Mapper": {}},"Dialect": {"ConnectionDetails": {"Dialect": "postgres","Driver": "","Database": "dcmaster","Host": "127.0.0.1","Port": "5432","User": "postgres","Password": "postgres","Encoding": "","URL": "","Pool": 5,"IdlePool": 0,"ConnMaxLifetime": 0,"Options": {"sslmode": "disable"},"RawOptions": ""}},"Elapsed": 9000500,"TX": {"ID": 4641137705029448206,"Mapper": {}}}
}

自定义验证规则验证create时同名验证及编辑时除本对象外同名的验证

func (d *DevopsModule) Validate(tx *pop.Connection) (*validate.Errors, error) {field := make(map[string]string)field["name"] = d.Namefield["code"] = d.Codefield["id"] = d.ID.String()return validate.Validate(&validators.StringIsPresent{Field: d.DefaultAction, Name: "DefaultAction", Message: "默认方法不能为空"},&NameNotTaken{Field: field, Name: "Name", tx: tx},), nil
}
type NameNotTaken struct {Name  stringField map[string]stringtx    *pop.Connection
}
func (v *NameNotTaken) IsValid(errors *validate.Errors) {tx := v.txmodule := &DevopsModule{}if err := tx.Find(module, v.Field["id"]); err == nil {if err := tx.Where("id != ?", v.Field["id"]).Where("name = ?", v.Field["name"]).First(module); err == nil {errors.Add(validators.GenerateKey(v.Name), "该名称已存在!")} else {if err := tx.Where("id != ?", v.Field["id"]).Where("code = ?", v.Field["code"]).First(module); err == nil {errors.Add(validators.GenerateKey(v.Name), "该编码已存在!")}}} else {if err := tx.Where("name = ?", v.Field["name"]).First(module); err == nil {errors.Add(validators.GenerateKey(v.Name), "该名称已存在!")} else {if err := tx.Where("code = ?", v.Field["code"]).First(module); err == nil {errors.Add(validators.GenerateKey(v.Name), "该编码已存在!")}}}}

写一个helper函数生成div块

"div":func (opts map[string]interface{},help plush.HelperContext)(template.HTML,error)  		{div := tags.New("div",opts)s,err := help.Block()if err != nil { return template.HTML(""),err}div.Append(s)return div.HTML(),nil},
//页面中使用:
<%= div({class:"row",id:"mydiv"}) {%> <b>生成的div中的b标签</b>
<%}%>