GORM does not output related data - go

Question

I ran into the following problem:
I specified relationships in the data structures, but some data is output empty.
For example: I get data on a product, the price is pulled up, the stocks are pulled up, but the data on the store where they are located is not pulled up to the stock.
The structures that I use:
type Product struct {
Id uint `json:"id"`
Code int `json:"code" gorm:"index"`
ProductName string `json:"name"`
Brand string `json:"brand"`
Price Price `json:"price" gorm:"foreignKey:ProductCode;references:Code"`
Stocks []Stock `json:"stock" gorm:"foreignKey:ProductCode;references:Code"`
}
type Stock struct {
ProductCode int `json:"product_code"`
StoreCode uint `json:"store_code" gorm:"index;"`
Quantity int `json:"quantity"`
Store Store `json:"store" gorm:"foreignKey:StoreId;references:StoreCode;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
Timestamp int64 `json:"timestamp"`
}
type Price struct {
ProductCode int `json:"product_code"`
OldPrice int `json:"old_price"`
CurrentPrice int `json:"current_price"`
WholesalePrice int `json:"wholesale_price"`
Timestamp int64 `json:"timestamp"`
}
type Store struct {
Id uint `json:"id" gorm:"primaryKey"`
StoreKaspiId string `json:"store_kaspi_id"`
StoreId uint `json:"store_id"`
CityId uint `json:"city_id"`
City City `json:"city" gorm:"foreignKey:CityId"`
StoreAddress string `json:"store_address"`
}
type City struct {
Id uint `json:"id"`
Name string `json:"name"`
}
Query result:
{
"id": 79,
"code": 687,
"name": "Электромясорубка Аксион M21.03",
"brand": "Аксион",
"price": {
"product_code": 687,
"old_price": 30990,
"current_price": 23910,
"wholesale_price": 19900,
"timestamp": 1628824966063
},
"stock": [
{
"product_code": 687,
"store_code": 15,
"quantity": 37,
"store": {
"id": 0,
"store_kaspi_id": "",
"store_id": 0,
"city_id": 0,
"city": {
"id": 0,
"name": ""
},
"store_address": ""
},
"timestamp": 1628824966219
},
{
"product_code": 687,
"store_code": 20,
"quantity": 39,
"store": {
"id": 0,
"store_kaspi_id": "",
"store_id": 0,
"city_id": 0,
"city": {
"id": 0,
"name": ""
},
"store_address": ""
},
"timestamp": 1628824966219
},
{
"product_code": 687,
"store_code": 42,
"quantity": 39,
"store": {
"id": 0,
"store_kaspi_id": "",
"store_id": 0,
"city_id": 0,
"city": {
"id": 0,
"name": ""
},
"store_address": ""
},
"timestamp": 1628824966219
},
{
"product_code": 687,
"store_code": 45,
"quantity": 47,
"store": {
"id": 0,
"store_kaspi_id": "",
"store_id": 0,
"city_id": 0,
"city": {
"id": 0,
"name": ""
},
"store_address": ""
},
"timestamp": 1628824966219
}
]
}
Please help me understand!
Thank you in advance!