Validation in GO "ozzo-validation" - go

Question

I'm nob in GO :) just try to create simple crud throw it using gin and plugin called ozzo-validation
My code:
package models
import (
validation "github.com/go-ozzo/ozzo-validation"
"gorm.io/gorm"
)
type Post struct {
gorm.Model
Name string `gorm:"type:varchar(255);"`
Desc string `gorm:"type:varchar(500);"`
}
type PostData struct {
Name string `json:"name"`
Desc string `json:"desc"`
}
func (p PostData) Validate() error {
return validation.ValidateStruct(&p,
validation.Field(&p.Name, validation.Required, validation.Length(5, 20)),
validation.Field(&p.Desc, validation.Required),
)
}
PostController:
package controllers
import (
"curd/app/models"
"fmt"
"github.com/gin-gonic/gin"
)
func Store(c *gin.Context) {
// Validate Input
var post models.PostData
err := post.Validate()
fmt.Println(err)
}
{
"name": "sdfsdfsfsdf"
}
The problem is once I submit the above JSON data from the postman the validation gives me this in terminal :
desc: cannot be blank; name: cannot be blank.

Answer 1

As noted in the comments, you need to decode the data from the HTTP request into the struct before you can perform validation. The validation errors you're seeing are a product of calling Validate() on a fresh instance (with zero values in every field) of your Post struct. Try this.
func Store(c *gin.Context) {
var post models.PostData
// This will infer what binder to use depending on the content-type header.
if err := c.ShouldBind(&post); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// Validate Input
err := post.Validate()
fmt.Println(err)
}