如何从Gin中发布的JSON获取特定参数？

Question

I need to get one param from posted json. And I don't want to make struct for only this. This is what I have tried

type NewTask struct {
    Price uint64 `json:"price"`
}

func (pc TaskController) Create(c *gin.Context) {

    var service Service
    if err := c.BindJSON(&service); err != nil {
        log.Println(err) // this works
    }

    var u NewTask
    if err := c.BindJSON(&u); err != nil {
        log.Println(err) // this return EOF error
    }

    fmt.Println(u.Price)
}

Requested Json data have many other fields including price

{
   ...other fields
   price: 30
}

But this don't work.I think its because I am binding twice, How can I success in binding multiple?

Thanks

Answer 1

Try to use ShouldBindJSON. The BindJSON is reading the body, so we are at EOF if the context Body get read multiple times.

ShouldBindJSON stores the request body into the context, and reuse when it is called again.