Golang using lowercase for first letter in Struct property

mysql templates web go

10,210

read the doc here

An identifier may be exported to permit access to it from another package. An identifier is exported if both:

the first character of the identifier's name is a Unicode upper case letter (Unicode class "Lu");
and the identifier is declared in thepackage block or it is a field name or method name.

All other identifiers are not exported.

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Author by

Yusuf Ibrahim

Java, PHP, and Javascript (Symfony, Laravel, VueJS, and AngularJS ) fullstack Web developer from Bandung Indonesia

Updated on June 20, 2022

Comments

Yusuf Ibrahim almost 2 years

I have an issue with Golang view template, I currently using lowercase in the struct properties to build the struct then passed it to the view as a map.

here is my Struct look like:

type User struct {
      uid                  int
      username, departname string
}

then I passed the collection of structs to the file view:

func (App *App) indexHander(w http.ResponseWriter, r *http.Request) {
      rows, err := App.db.Query("SELECT * FROM userinfo")
      checkErr(err)

      t, _ := template.ParseFiles(App.folderpath + "/list.gtpl")

      users := make([]User, 0) // define empty collection of users

      for rows.Next() {
          var uid int 
          var username string
          var departname string
          var created string
          err = rows.Scan(&uid, &username, &departname, &created)
          checkErr(err)
          users = append(users, User{uid, username, departname})

      }   

      t.Execute(w, users)

      defer rows.Close()
  }

and here is my view html code:

<html>
      <head>
      <title></title>
      </head>
      <body>
          <ul>
          {{ range  . }}
             <li>{{ .username }}</li>
          {{ end }}
          </ul>
      </body>
  </html>

Those code above gave me empty users data:

But however, using capitalize first letter in struct give me working result:

Struct

type User struct {
     Uid                  int
     Username, Departname string  
}

html

<html>
      <head>
      <title></title>
      </head>
      <body>
          <ul>
          {{ range  . }}
             <li>{{ .Username }}</li>
          {{ end }}
          </ul>
      </body>
  </html>

it works now