Gin How define a common template variable in middleware

router := gin.Default()

router.use(func (ctx *gin.Context) {
    // if user.isLogged()
        // how define a variable use in template
    // endif
})

like fiber can do this

app.Use(func(ctx *fiber.Ctx) error {
    _ = ctx.Bind(fiber.Map{
        "time": time.Now().UnixNano(),
    })
    return ctx.Next()
})

app.Get("/", func(ctx *fiber.Ctx) error {
    return ctx.Render("tmpl_name", fiber.Map{
    })
})

// in template use {{ .time }}

Scenarios such as public page title suffix

{{ .page_title }} - {{ .common_title_suffix }}

page title - site-name

Comment From: toudi

how about c.Set and c.Get ? so in your example:

router.use(func (ctx *gin.Context) {
    // if user.isLogged()
            c.Set("userName", "fooBar")
    // endif
})

app.GET("/", func(c *gin.Context) {
    user, exists := c.Get("userName")
    if exists {
        // user is an interface so you have to cast it to a propert (already known type) like so:
        userName := user.(string)
         // or a pointer like so:
        // stuffFromContext := user.(*someModelStruct)
    }
})

Comment From: cevin

how about c.Set and c.Get ? so in your example:

```go router.use(func (ctx *gin.Context) { // if user.isLogged() c.Set("userName", "fooBar") // endif })

app.GET("/", func(c gin.Context) { user, exists := c.Get("userName") if exists { // user is an interface so you have to cast it to a propert (already known type) like so: userName := user.(string) // or a pointer like so: // stuffFromContext := user.(someModelStruct) } }) ```

However, for Fiber and Echo, it feels better to have Ctx's dedicated Map objects automatically merged into template variables when performing template rendering.

Otherwise in the case of Gin, when I have a lot of Handlers, I need to write gin.H{ xx: ctx.Get() } repeatedly in each Handle. That's too bad.