- it技术
- golang-buffalo框架
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 = lvl
l.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.Name
field["code"] = d.Code
field["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 string
Field map[string]string
tx *pop.Connection
}
func (v *NameNotTaken) IsValid(errors *validate.Errors) {
tx := v.tx
module := &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>
<%}%>
