Gorm gorm cant detect proper foreign key in case of field embedding

https://github.com/go-gorm/playground/pull/414

Hi, gorm cant detect proper foreign key in case of field embedding. How to fix it?

type A struct {
    ID uint
}

type B struct {
    A `gorm:"embedded"`
}

type C struct {
    ID uint
    B  B
}

func Migrate(db *gorm.DB) error {
    return db.AutoMigrate(
        B{},
        C{},
    )
}

...

invalid field found for struct models.C's field B: define a valid foreign key for relations or implement the Valuer/Scanner interface
panic: interface conversion: interface {} is models.C, not string [recovered]
    panic: interface conversion: interface {} is models.C, not string

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Comment From: jinzhu

Hi @gstarikov

In your issues, the problem is not caused by embedding, but B, C doesn't have a valid foreign key definition.

Checkout how to define a valid belongs to, has one association from https://gorm.io/docs/has_one.html