Marshalling and unmarshalling [closed] - go

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I'm a golang intern and i have a question . I have a struct
package migrations
import (
"gorm.io/gorm"
)
type Service struct {
gorm.Model
CategoryId uint `json:"category_id"`
ProviderId uint `json:"provider_id"`
CategoryModel Category `gorm:"ForeignKey:category_id"`
ProviderModel Provider `gorm:"ForeignKey:provider_id"`
Uuid string `json:"uuid"`
Title string `json:"title"`
StartDate string `json:"start_date"`
EndDate string `json:"end_date"`
Unit string `json:"unit"`
PaymentType string `json:"payment_type"`
CityId int `json:"city_id"`
HotelId int `json:"hotel_id"`
GroupId int `json:"group_id"`
UserId int `json:"user_id"`
Status bool `json:"status"`
ServiceItems []serviceItem `gorm:"foreignKey:service_id"`
Pricing []ServicePricing `gorm:"foreignKey:service_id"`
Image []ServiceImage `gorm:"foreignKey:service_id"`
}
type serviceItem struct {
ServiceId uint `json:"service_id"`
ItemId uint `json:"item_id"`
Sort uint `json:"sort"`
Status bool `json:"status"`
}
which connect to database . also i have a struct which is my request:
package services
type Request struct {
ProviderId uint `json:"provider_Id" binding:"required"`
CategoryId uint `json:"category_id" binding:"required"`
Title string `json:"title" binding:"required"`
Unit string `json:"unit"`
PaymentType string `json:"payment_type"`
StartDate string `json:"start_date" binding:"required"`
EndDate string `json:"end_date" binding:"required"`
HotelId int `json:"hotel_id"`
GroupId int `json:"group_id"`
UserId int `json:"user_id"`
CityId int `json:"city_id" binding:"required"`
ServiceItems []ServiceItem `json:"service_items"`
}
type ServiceItem struct {
ItemId uint `json:"item_id"`
ServiceId uint `json:"service_id"`
Sort uint `json:"sort"`
}
when i use code blow request.serviceItem wont fill the migration.serviceItem
func Create(c *gin.Context) (error, Response) {
var req Request
var res Response
if e := c.ShouldBind(&req); e != nil {
return e, res
}
result, e := services.Create(req, req.ServiceItems)
if e != nil {
return e, res
}
err, resp := decoder(res, result)
if err != nil {
return err, resp
}
return nil, resp
}
//package services
func Create(req interface{}, items interface{}) (migrations.Service, error) {
var service migrations.Service
b, e := json.Marshal(req)
if e != nil {
return service, e
}
e = json.Unmarshal(b, &service)
if e != nil {
return service, e
}
result := migrations.DB.Model(migrations.Service{}).Create(&service)
if result.Error != nil {
return service, result.Error
}
return service, nil
}