How to Store Embedded Structs in GORM as a Single Entity?-Golang-php.cn

How to Store Embedded Structs in GORM as a Single Entity?

Susan Sarandon

Release： 2024-11-02 22:04:30

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How to Store Embedded Structs in GORM as a Single Entity?

Incorporating Embedded Structs in GORM

Storing embedded structs with GORM poses a challenge when dealing with types such as:

<code class="go">type A struct {
    point GeoPoint
}

type GeoPoint struct {
    Lat float64
    Lon float64
}</code>

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By default, GORM attempts to create a separate table for the embedded struct GeoPoint. However, to add it as a field within the parent struct A, consider the following solution inspired by the insights of Chris:

<code class="go">import (
    "encoding/json"

    "gorm.io/gorm"
)

// Define custom Scan and Value methods for ChildArray to enable automatic marshalling and unmarshalling.
type ChildArray []Child

func (sla *ChildArray) Scan(src interface{}) error {
    return json.Unmarshal(src.([]byte), &sla)
}

func (sla ChildArray) Value() (driver.Value, error) {
    val, err := json.Marshal(sla)
    return string(val), err
}

// Define the parent struct with the embedded ChildArray.
type Parent struct {
    *gorm.Model
    Childrens ChildArray `gorm:"column:childrens;type:longtext"`
}</code>

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This approach allows for seamless marshalling and unmarshalling of the embedded struct within the parent struct, ensuring it is stored and retrieved from the database as a single entity.

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