Field Overwriting Issue with Embedded Structs in GORM

[TalesPalma]

GORM Playground Link

https://github.com/go-gorm/playground/pull/1

Description

When using GORM to map structs to a database, an issue arises when embedding structs that have fields with the same name as those in the outer struct. Specifically, when embedding an Author struct within a Food struct, if both structs contain a field named Name, only the outer struct's field (Food.Name) is saved to the database, while the embedded struct's field (Author.Name) is ignored.

Example Code:

package main

import (
    "gorm.io/driver/sqlite"
    "gorm.io/gorm"
    "log"
)

type Author struct {
    gorm.Model
    Name  string `json:"name" gorm:"not null"`
    Email string `json:"email" gorm:"not null"`
}

type Food struct {
    gorm.Model
    Name          string `json:"name" gorm:"not null"`
    Price         string `json:"price" gorm:"not null"`
    Calories      string `json:"calories"`
    Proteins      string `json:"proteins"`
    Fats          string `json:"fats"`
    Carbohydrates string `json:"carbohydrates"`
    Sodium        string `json:"sodium"`
    Author        Author `json:"author" gorm:"embedded"`
}

func main() {
    db, err := gorm.Open(sqlite.Open("food.db"), &gorm.Config{})
    if err != nil {
        log.Fatalf("failed to connect to the database: %v", err)
    }

    // Auto-migrate the Food and Author structs to create the necessary tables
    if err := db.AutoMigrate(&Food{}); err != nil {
        log.Fatalf("failed to migrate: %v", err)
    }

    // Create a new Food item with an embedded Author
    food := Food{
        Name: "Pasta",
        Author: Author{
            Name:      "Chef Mario",
            Biography: "A renowned chef known for Italian cuisine.",
        },
    }

    // Save the food item to the database
    if err := db.Create(&food).Error; err != nil {
        log.Fatalf("failed to create food item: %v", err)
    }

    log.Println("Food item created successfully!")
}

[github-actions[bot]]

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