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Docs: Update README.md Custom Validator sample code (#2448) 

Co-authored-by: Bo-Yi Wu <appleboy.tw@gmail.com>
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森 優太 2020-08-01 16:26:29 +09:00 committed by GitHub
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@ -758,12 +758,12 @@ import (
"github.com/gin-gonic/gin"
"github.com/gin-gonic/gin/binding"
"gopkg.in/go-playground/validator.v10"
"github.com/go-playground/validator/v10"
)
// Booking contains binded and validated data.
type Booking struct {
CheckIn time.Time `form:"check_in" binding:"required" time_format:"2006-01-02"`
CheckIn time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn" time_format:"2006-01-02"`
}
@ -800,11 +800,14 @@ func getBookable(c *gin.Context) {
```
```console
$ curl "localhost:8085/bookable?check_in=2018-04-16&check_out=2018-04-17"
$ curl "localhost:8085/bookable?check_in=2030-04-16&check_out=2030-04-17"
{"message":"Booking dates are valid!"}
$ curl "localhost:8085/bookable?check_in=2018-03-10&check_out=2018-03-09"
$ curl "localhost:8085/bookable?check_in=2030-03-10&check_out=2030-03-09"
{"error":"Key: 'Booking.CheckOut' Error:Field validation for 'CheckOut' failed on the 'gtfield' tag"}
$ curl "localhost:8085/bookable?check_in=2000-03-09&check_out=2000-03-10"
{"error":"Key: 'Booking.CheckIn' Error:Field validation for 'CheckIn' failed on the 'bookabledate' tag"}%
```
[Struct level validations](https://github.com/go-playground/validator/releases/tag/v8.7) can also be registered this way.