There are a few differences:

* `table=True` tells SQLModel that this is a *table model*, it should represent a **table** in the SQL database, it's not just a *data model* (as would be any other regular Pydantic class).

* `Field(primary_key=True)` tells SQLModel that the `id` is the **primary key** in the SQL database (you can learn more about SQL primary keys in the SQLModel docs).

	Name  string
	Token Token `gorm:"foreignKey:UserID"`
}

func (t *TokenOwner) BeforeSave(tx *gorm.DB) error {
	t.Name += "_name"
	return nil
}

type Token struct {
	UserID  int    `gorm:"primary_key"`
	Content string `gorm:"type:varchar(100)"`
}

func (t *Token) BeforeSave(tx *gorm.DB) error {
	t.Content += "_encrypted"
	return nil
}

func TestSaveWithHooks(t *testing.T) {

	}

	AssertEqual(t, p, p2)
}

func TestStringPrimaryKeyForNumericValueStartingWithZero(t *testing.T) {
	type AddressByZipCode struct {
		ZipCode string `gorm:"primary_key"`
		Address string
	}

	DB.Migrator().DropTable(&AddressByZipCode{})
	if err := DB.AutoMigrate(&AddressByZipCode{}); err != nil {
		t.Fatalf("failed to migrate, got error %v", err)
	}

	} else {
		primarySchemaName := primarySchema.Name
		if primarySchemaName == "" {
			primarySchemaName = relation.FieldSchema.Name
		}

		if len(relation.primaryKeys) > 0 {
			for _, primaryKey := range relation.primaryKeys {
				if f := primarySchema.LookUpField(primaryKey); f != nil {
					primaryFields = append(primaryFields, f)
				}
			}
		} else {
			primaryFields = primarySchema.PrimaryFields
		}

				createTableSQL += "PRIMARY KEY ?,"
				primaryKeys := make([]interface{}, 0, len(stmt.Schema.PrimaryFields))
				for _, field := range stmt.Schema.PrimaryFields {
					primaryKeys = append(primaryKeys, clause.Column{Name: field.DBName})
				}

				values = append(values, primaryKeys)
			}

			for _, idx := range stmt.Schema.ParseIndexes() {

					for _, rf := range r.References {
						var primaryKey, primaryKeySchema string
						if rf.PrimaryKey != nil {
							primaryKey, primaryKeySchema = rf.PrimaryKey.Name, rf.PrimaryKey.Schema.Name
						}
						refs = append(refs, fmt.Sprintf(
							"{PrimaryKey: %v PrimaryKeySchame: %v ForeignKey: %v ForeignKeySchema: %v PrimaryValue: %v OwnPrimaryKey: %v}",

	Name     string
	CustomID string
	Type     string
}

type Company struct {
	ID   int
	Name string
}

type Language struct {
	Code string `gorm:"primarykey"`
	Name string
}

type Coupon struct {
	ID               int              `gorm:"primarykey; size:255"`
	AppliesToProduct []*CouponProduct `gorm:"foreignKey:CouponId;constraint:OnDelete:CASCADE"`
	AmountOff        uint32           `gorm:"column:amount_off"`

	// check fields
	fields := []schema.Field{
		{Name: "ID", DBName: "id", BindNames: []string{"Model", "ID"}, DataType: schema.Uint, PrimaryKey: true, Tag: `gorm:"primarykey"`, TagSettings: map[string]string{"PRIMARYKEY": "PRIMARYKEY"}, Size: 64, HasDefaultValue: true, AutoIncrement: true},
		{Name: "CreatedAt", DBName: "created_at", BindNames: []string{"Model", "CreatedAt"}, DataType: schema.Time},

			c.AfterExpression.Build(builder)
		}
	}
}

const (
	PrimaryKey   string = "~~~py~~~" // primary key
	CurrentTable string = "~~~ct~~~" // current table
	Associations string = "~~~as~~~" // associations
)

var (
	currentTable  = Table{Name: CurrentTable}
	PrimaryColumn = Column{Table: CurrentTable, Name: PrimaryKey}
)

// Column quote with name
type Column struct {
	Table string
	Name  string

			}
			builder.WriteQuoted(assignment.Column)
			builder.WriteByte('=')
			builder.AddVar(builder, assignment.Value)
		}
	} else {
		builder.WriteQuoted(Column{Name: PrimaryKey})
		builder.WriteByte('=')
		builder.WriteQuoted(Column{Name: PrimaryKey})
	}
}

// MergeClause merge assignments clauses
func (set Set) MergeClause(clause *Clause) {
	copiedAssignments := make([]Assignment, len(set))
	copy(copiedAssignments, set)