names := strings.Split(chk, ",")
			if len(names) > 1 && regEnLetterAndMidline.MatchString(names[0]) {
				checks[names[0]] = CheckConstraint{Name: names[0], Constraint: strings.Join(names[1:], ","), Field: field}
			} else {
				if names[0] == "" {
					chk = strings.Join(names[1:], ",")
				}
				name := schema.namer.CheckerName(schema.Table, field.DBName)
				checks[name] = CheckConstraint{Name: name, Constraint: chk, Field: field}
			}
		}

							}
						}
					} else {
						fromClause.Joins = append(fromClause.Joins, clause.Join{
							Expression: clause.NamedExpr{SQL: join.Name, Vars: join.Conds},
						})
					}
				} else {
					fromClause.Joins = append(fromClause.Joins, clause.Join{
						Expression: clause.NamedExpr{SQL: join.Name, Vars: join.Conds},
					})
				}
			}

			db.Statement.AddClause(fromClause)
		} else {

			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
			nestedJoinSchemas := joinFields[idx][:len(joinFields[idx])-1]
			// current reflect value
			currentReflectValue := reflectValue

			}

			if r.JoinTable != nil {
				if r.JoinTable.Name != relation.JoinTable.Name {
					t.Errorf("schema %v relation's join table name expects %v, but got %v", s, relation.JoinTable.Name, r.JoinTable.Name)
				}

				if r.JoinTable.Table != relation.JoinTable.Table {
					t.Errorf("schema %v relation's join table tablename expects %v, but got %v", s, relation.JoinTable.Table, r.JoinTable.Table)
				}

		default:
			results[idx] = "nil"
			vv := reflect.ValueOf(v)
			if vv.IsValid() && !vv.IsZero() {
				results[idx] = fmt.Sprint(reflect.Indirect(vv).Interface())
			}
		}
	}

	return strings.Join(results, "_")
}

func Contains(elems []string, elem string) bool {
	for _, e := range elems {
		if elem == e {
			return true
		}
	}
	return false
}

func AssertEqual(x, y interface{}) bool {

	}
	return
}

// Joins specify Joins conditions
//
//	db.Joins("Account").Find(&user)
//	db.Joins("JOIN emails ON emails.user_id = users.id AND emails.email = ?", "******@****.***").Find(&user)
//	db.Joins("Account", DB.Select("id").Where("user_id = users.id AND name = ?", "someName").Model(&Account{}))
func (db *DB) Joins(query string, args ...interface{}) (tx *DB) {
	return joins(db, clause.LeftJoin, query, args...)
}

			k := strings.TrimSpace(strings.ToUpper(v[0]))
			if k == "INDEX" || k == "UNIQUEINDEX" {
				var (
					name       string
					tag        = strings.Join(v[1:], ":")
					idx        = strings.Index(tag, ",")
					tagSetting = strings.Join(strings.Split(tag, ",")[1:], ",")
					settings   = ParseTagSetting(tagSetting, ",")
					length, _  = strconv.Atoi(settings["LENGTH"])
				)

				if idx == -1 {

				}

				if rel.Type == schema.HasOne || rel.Type == schema.HasMany {
					beDependedOn[rel.FieldSchema] = true
				}

				if rel.JoinTable != nil {
					// append join value
					defer func(rel *schema.Relationship, joinValue interface{}) {
						if !beDependedOn[rel.FieldSchema] {
							dep.Depends = append(dep.Depends, rel.FieldSchema)
						} else {

	query := DB.Model(&User{}).
		Select("users.id as users_id, users.name as users_name, pets.id as pets_id, pets.name as pets_name").
		Joins("inner join pets on pets.user_id = users.id")

	if err := DB.Migrator().CreateView("users_pets", gorm.ViewOption{Query: query}); err != nil {
		t.Fatalf("Failed to crate view, got %v", err)
	}

	var count int64
	if err := DB.Table("users_pets").Count(&count).Error; err != nil {

	value1 := Value{
		Name: "value",
		Nested: Nested{
			Preloads: []*Preload{
				{Value: "p1"}, {Value: "p2"},
			},
			Join: Join{Value: "j1"},
		},
	}
	value2 := Value{
		Name: "value2",
		Nested: Nested{
			Preloads: []*Preload{
				{Value: "p3"}, {Value: "p4"}, {Value: "p5"},
			},
			Join: Join{Value: "j2"},
		},
	}