t.Errorf("Expected to get Author name %v but got: %v", NewPost.Author.Name, hnPost.Author.Name)
	}

	if !reflect.DeepEqual(NewPost.Author.Content, hnPost.Author.Content) {
		t.Errorf("Expected to get Author content %v but got: %v", NewPost.Author.Content, hnPost.Author.Content)
	}

	if hnPost.Author.ContentPtr != nil {
		t.Errorf("Expected to get nil Author contentPtr but got: %v", hnPost.Author.ContentPtr)
	}

	}

	var contents []ItemContent
	if err := tx.Find(&contents).Error; err != nil {
		t.Errorf("failed to find contents, got error: %v", err)
	}
	if len(contents) != 3 {
		t.Errorf("expected %d contents, got %d", 3, len(contents))
	}

	// test delete
	if err := tx.Model(&item).Association("Contents").Unscoped().Delete(&contents[0]); err != nil {
		t.Errorf("failed to delete Contents, got error: %v", err)
	}

	Value(ctx context.Context, field *Field, dst reflect.Value, fieldValue interface{}) (interface{}, error)
}

// JSONSerializer json serializer
type JSONSerializer struct{}

// Scan implements serializer interface
func (JSONSerializer) Scan(ctx context.Context, field *Field, dst reflect.Value, dbValue interface{}) (err error) {
	fieldValue := reflect.New(field.FieldType)

	if dbValue != nil {
		var bytes []byte

	c.conn.got = append(c.conn.got, query)
	return c.Tx.ExecContext(ctx, query, args...)
}

func (c *wrapperTx) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) {
	c.conn.got = append(c.conn.got, query)
	return c.Tx.QueryContext(ctx, query, args...)
}

		}
	}

	for _, f := range p.fns {
		f(db)
	}

	if stmt.SQL.Len() > 0 {
		db.Logger.Trace(stmt.Context, curTime, func() (string, int64) {
			sql, vars := stmt.SQL.String(), stmt.Vars
			if filter, ok := db.Logger.(ParamsFilter); ok {
				sql, vars = filter.ParamsFilter(stmt.Context, stmt.SQL.String(), stmt.Vars...)
			}
			return db.Dialector.Explain(sql, vars...), db.RowsAffected
		}, db.Error)
	}

import (
	"context"
	"errors"
	"sync"
	"testing"
	"time"

	"gorm.io/gorm"
	. "gorm.io/gorm/utils/tests"
)

func TestPreparedStmt(t *testing.T) {
	tx := DB.Session(&gorm.Session{PrepareStmt: true})

	if _, ok := tx.ConnPool.(*gorm.PreparedStmtDB); !ok {
		t.Fatalf("should assign PreparedStatement Manager back to database when using PrepareStmt mode")
	}

	for idx, field := range fields {
		if field == nil {
			continue
		}

		if len(joinFields) == 0 || len(joinFields[idx]) == 0 {
			db.AddError(field.Set(db.Statement.Context, reflectValue, values[idx]))
		} else { // joinFields count is larger than 2 when using join
			var isNilPtrValue bool
			var relValue reflect.Value
			// does not contain raw dbname

		// sqlserver driver treats NULL and 'NULL' the same
		t.Skip("skip sqlserver")
	}

	type NullModel struct {
		ID      uint
		Content string `gorm:"default:null"`
	}

	type NullStringModel struct {
		ID      uint
		Content string `gorm:"default:'null'"`
		Active  bool   `gorm:"default:false"`
	}

	tableName := "null_string_model"

	DB.Migrator().DropTable(tableName)

	LogLevel                  LogLevel
}

// Interface logger interface
type Interface interface {
	LogMode(LogLevel) Interface
	Info(context.Context, string, ...interface{})
	Warn(context.Context, string, ...interface{})
	Error(context.Context, string, ...interface{})
	Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error)
}

var (
	// Discard logger will print any log to io.Discard

						if _, isZero := pkField.ValueOf(db.Statement.Context, rv); isZero {
							db.AddError(pkField.Set(db.Statement.Context, rv, insertID))
							insertID += pkField.AutoIncrementIncrement
						}
					}
				}
			case reflect.Struct:
				_, isZero := pkField.ValueOf(db.Statement.Context, db.Statement.ReflectValue)
				if isZero {
					db.AddError(pkField.Set(db.Statement.Context, db.Statement.ReflectValue, insertID))
				}
			}