Method readStructColumns

db.go:281–414

(t reflect.Type)

}

func (m *DbMap) readStructColumns(t reflect.Type) (cols []*ColumnMap, primaryKey []*ColumnMap) {
	primaryKey = make([]*ColumnMap, 0)
	n := t.NumField()
	for i := 0; i < n; i++ {
		f := t.Field(i)
		if f.Anonymous && f.Type.Kind() == reflect.Struct {
			// Recursively add nested fields in embedded structs.
			subcols, subpk := m.readStructColumns(f.Type)
			// Don't append nested fields that have the same field
			// name as an already-mapped field.
			for _, subcol := range subcols {
				shouldAppend := true
				for _, col := range cols {
					if !subcol.Transient && subcol.fieldName == col.fieldName {
						shouldAppend = false
						break
					}
				}
				if shouldAppend {
					cols = append(cols, subcol)
				}
			}
			if subpk != nil {
				primaryKey = append(primaryKey, subpk...)
			}
		} else {
			// Tag = Name { ','  Option }
			// Option = OptionKey [ ':' OptionValue ]
			cArguments := strings.Split(f.Tag.Get("db"), ",")
			columnName := cArguments[0]
			var maxSize int
			var defaultValue string
			var isAuto bool
			var isPK bool
			var isNotNull bool
			for _, argString := range cArguments[1:] {
				argString = strings.TrimSpace(argString)
				arg := strings.SplitN(argString, ":", 2)

				// check mandatory/unexpected option values
				switch arg[0] {
				case "size", "default":
					// options requiring value
					if len(arg) == 1 {
						panic(fmt.Sprintf("missing option value for option %v on field %v", arg[0], f.Name))
					}
				default:
					// options where value is invalid (currently all other options)
					if len(arg) == 2 {
						panic(fmt.Sprintf("unexpected option value for option %v on field %v", arg[0], f.Name))
					}
				}

				switch arg[0] {
				case "size":
					maxSize, _ = strconv.Atoi(arg[1])
				case "default":
					defaultValue = arg[1]