Gorm if column name dupilicat, just return one column

type School struct {
    ID   int64  `gorm:"primary_key" json:"id"`
    Name string `json:"name"`
}
type Student struct {
    ID       int64  `gorm:"primary_key" json:"id"`
    Name     string `json:"name"`
    SchoolId int64  `json:"schoolId"`
}
// if column duplicat,rows.Columns() can add suffix such as name,name(1),name(2)?
func TestGORM(t *testing.T) {

    result := []map[string]interface{}{}
    tx := DB.Model(&Student{}).Select("students.*,b.*").Joins("left join schools as b on students.school_id = b.id")
    rows, err := tx.Rows()
    if err != nil {
        panic(err)
    }

    cl, err := rows.Columns()
    fmt.Println("columns:", cl)
    tx = tx.Find(&result)
    fmt.Println("result:", result)
    err = tx.Error
    if err != nil {
        t.Errorf("Failed, got error: %v", err)
    }
}

sql as this

SELECT students.*,b.* FROM "students" left join schools as b on students.school_id = b.id

but this sql can run right in postgresql.

https://github.com/sumumont/playground

if column duplicat,rows.Columns() can add suffix such as name,name(1),name(2)?

Comment From: github-actions[bot]

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Comment From: github-actions[bot]

Comment From: black-06

Try Joins-Preloading:

type School struct {
    ID   int64  `gorm:"primary_key" json:"id"`
    Name string `json:"name"`
}
type Student struct {
    ID       int64  `gorm:"primary_key" json:"id"`
    Name     string `json:"name"`
    SchoolId int64  `json:"schoolId"`
}

func TestGORM(t *testing.T) {
    type StudentResult struct {
        Student
        School School
    }
    result := StudentResult{}
    db.Table("students").Joins("School").Find(&result)
}

SQL is

SELECT `students`.`id`,`students`.`name`,`students`.`school_id`,`School`.`id` AS `School__id`,`School`.`name` AS `School__name` FROM `students` LEFT JOIN `schools` `School` ON `students`.`school_id` = `School`.`id`

Comment From: github-actions[bot]

Comment From: sumumont

I am making app like navicat , so I need get all cloumns.

Comment From: github-actions[bot]

Comment From: black-06

if column duplicat, rows.Columns() can add suffix such as name,name(1),name(2)?

rows.Columns() is part of the golang standard library.

Or you can Scan yourself without GROM.

columnTypes, err := rows.ColumnTypes()
assert.Nil(t, err)
for _, columnType := range columnTypes {
    fmt.Printf("%v\t", columnType.Name())
}
fmt.Println()

for rows.Next() {
    values := make([]interface{}, len(columnTypes))
    for idx, columnType := range columnTypes {
        if columnType.ScanType() != nil {
            values[idx] = reflect.New(reflect.PtrTo(columnType.ScanType())).Interface()
        } else {
            values[idx] = new(interface{})
        }
    }
    err = rows.Scan(values...)
    assert.Nil(t, err)

    for _, value := range values {
        if reflectValue := reflect.Indirect(reflect.Indirect(reflect.ValueOf(value))); reflectValue.IsValid() {
            value = reflectValue.Interface()
            if valuer, ok := value.(driver.Valuer); ok {
                value, _ = valuer.Value()
            } else if b, ok := value.(sql.RawBytes); ok {
                value = string(b)
            }
        } else {
            value = nil
        }
        fmt.Printf("%v\t", value)
    }
    fmt.Println()
}

std: | id | name | school_id | id | name | | -- | -- | -- | -- | -- | | 1 | student_1 | 1 | 1 | school_1 |

Comment From: github-actions[bot]

Comment From: sumumont

tks.