package orm import ( "errors" "fmt" "reflect" "strings" ) var errSkipField = errors.New("skip field") // field info collection type fields struct { pk *fieldInfo columns map[string]*fieldInfo fields map[string]*fieldInfo fieldsLow map[string]*fieldInfo fieldsByType map[int][]*fieldInfo fieldsRel []*fieldInfo fieldsReverse []*fieldInfo fieldsDB []*fieldInfo rels []*fieldInfo orders []string dbcols []string } // add field info func (f *fields) Add(fi *fieldInfo) (added bool) { if f.fields[fi.name] == nil && f.columns[fi.column] == nil { f.columns[fi.column] = fi f.fields[fi.name] = fi f.fieldsLow[strings.ToLower(fi.name)] = fi } else { return } if _, ok := f.fieldsByType[fi.fieldType]; ok == false { f.fieldsByType[fi.fieldType] = make([]*fieldInfo, 0) } f.fieldsByType[fi.fieldType] = append(f.fieldsByType[fi.fieldType], fi) f.orders = append(f.orders, fi.column) if fi.dbcol { f.dbcols = append(f.dbcols, fi.column) f.fieldsDB = append(f.fieldsDB, fi) } if fi.rel { f.fieldsRel = append(f.fieldsRel, fi) } if fi.reverse { f.fieldsReverse = append(f.fieldsReverse, fi) } return true } // get field info by name func (f *fields) GetByName(name string) *fieldInfo { return f.fields[name] } // get field info by column name func (f *fields) GetByColumn(column string) *fieldInfo { return f.columns[column] } // get field info by string, name is prior func (f *fields) GetByAny(name string) (*fieldInfo, bool) { if fi, ok := f.fields[name]; ok { return fi, ok } if fi, ok := f.fieldsLow[strings.ToLower(name)]; ok { return fi, ok } if fi, ok := f.columns[name]; ok { return fi, ok } return nil, false } // create new field info collection func newFields() *fields { f := new(fields) f.fields = make(map[string]*fieldInfo) f.fieldsLow = make(map[string]*fieldInfo) f.columns = make(map[string]*fieldInfo) f.fieldsByType = make(map[int][]*fieldInfo) return f } // single field info type fieldInfo struct { mi *modelInfo fieldIndex int fieldType int dbcol bool inModel bool name string fullName string column string addrValue reflect.Value sf reflect.StructField auto bool pk bool null bool index bool unique bool initial StrTo size int auto_now bool auto_now_add bool rel bool reverse bool reverseField string reverseFieldInfo *fieldInfo reverseFieldInfoTwo *fieldInfo reverseFieldInfoM2M *fieldInfo relTable string relThrough string relThroughModelInfo *modelInfo relModelInfo *modelInfo digits int decimals int isFielder bool onDelete string } // new field info func newFieldInfo(mi *modelInfo, field reflect.Value, sf reflect.StructField) (fi *fieldInfo, err error) { var ( tag string tagValue string initial StrTo fieldType int attrs map[string]bool tags map[string]string addrField reflect.Value ) fi = new(fieldInfo) addrField = field if field.CanAddr() && field.Kind() != reflect.Ptr { addrField = field.Addr() if _, ok := addrField.Interface().(Fielder); !ok { if field.Kind() == reflect.Slice { addrField = field } } } parseStructTag(sf.Tag.Get(defaultStructTagName), &attrs, &tags) if _, ok := attrs["-"]; ok { return nil, errSkipField } digits := tags["digits"] decimals := tags["decimals"] size := tags["size"] onDelete := tags["on_delete"] initial.Clear() if v, ok := tags["default"]; ok { initial.Set(v) } checkType: switch f := addrField.Interface().(type) { case Fielder: fi.isFielder = true if field.Kind() == reflect.Ptr { err = fmt.Errorf("the model Fielder can not be use ptr") goto end } fieldType = f.FieldType() if fieldType&IsRelField > 0 { err = fmt.Errorf("unsupport rel type custom field") goto end } default: tag = "rel" tagValue = tags[tag] if tagValue != "" { switch tagValue { case "fk": fieldType = RelForeignKey break checkType case "one": fieldType = RelOneToOne break checkType case "m2m": fieldType = RelManyToMany if tv := tags["rel_table"]; tv != "" { fi.relTable = tv } else if tv := tags["rel_through"]; tv != "" { fi.relThrough = tv } break checkType default: err = fmt.Errorf("error") goto wrongTag } } tag = "reverse" tagValue = tags[tag] if tagValue != "" { switch tagValue { case "one": fieldType = RelReverseOne break checkType case "many": fieldType = RelReverseMany break checkType default: err = fmt.Errorf("error") goto wrongTag } } fieldType, err = getFieldType(addrField) if err != nil { goto end } if fieldType == TypeCharField && tags["type"] == "text" { fieldType = TypeTextField } if fieldType == TypeFloatField && (digits != "" || decimals != "") { fieldType = TypeDecimalField } if fieldType == TypeDateTimeField && tags["type"] == "date" { fieldType = TypeDateField } } switch fieldType { case RelForeignKey, RelOneToOne, RelReverseOne: if field.Kind() != reflect.Ptr { err = fmt.Errorf("rel/reverse:one field must be *%s", field.Type().Name()) goto end } case RelManyToMany, RelReverseMany: if field.Kind() != reflect.Slice { err = fmt.Errorf("rel/reverse:many field must be slice") goto end } else { if field.Type().Elem().Kind() != reflect.Ptr { err = fmt.Errorf("rel/reverse:many slice must be []*%s", field.Type().Elem().Name()) goto end } } } if fieldType&IsFieldType == 0 { err = fmt.Errorf("wrong field type") goto end } fi.fieldType = fieldType fi.name = sf.Name fi.column = getColumnName(fieldType, addrField, sf, tags["column"]) fi.addrValue = addrField fi.sf = sf fi.fullName = mi.fullName + "." + sf.Name fi.null = attrs["null"] fi.index = attrs["index"] fi.auto = attrs["auto"] fi.pk = attrs["pk"] fi.unique = attrs["unique"] switch fieldType { case RelManyToMany, RelReverseMany, RelReverseOne: fi.null = false fi.index = false fi.auto = false fi.pk = false fi.unique = false default: fi.dbcol = true } switch fieldType { case RelForeignKey, RelOneToOne, RelManyToMany: fi.rel = true if fieldType == RelOneToOne { fi.unique = true } case RelReverseMany, RelReverseOne: fi.reverse = true } if fi.rel && fi.dbcol { switch onDelete { case od_CASCADE, od_DO_NOTHING: case od_SET_DEFAULT: if initial.Exist() == false { err = errors.New("on_delete: set_default need set field a default value") goto end } case od_SET_NULL: if fi.null == false { err = errors.New("on_delete: set_null need set field null") goto end } default: if onDelete == "" { onDelete = od_CASCADE } else { err = fmt.Errorf("on_delete value expected choice in `cascade,set_null,set_default,do_nothing`, unknown `%s`", onDelete) goto end } } fi.onDelete = onDelete } switch fieldType { case TypeBooleanField: case TypeCharField: if size != "" { v, e := StrTo(size).Int32() if e != nil { err = fmt.Errorf("wrong size value `%s`", size) } else { fi.size = int(v) } } else { fi.size = 255 } case TypeTextField: fi.index = false fi.unique = false case TypeDateField, TypeDateTimeField: if attrs["auto_now"] { fi.auto_now = true } else if attrs["auto_now_add"] { fi.auto_now_add = true } case TypeFloatField: case TypeDecimalField: d1 := digits d2 := decimals v1, er1 := StrTo(d1).Int8() v2, er2 := StrTo(d2).Int8() if er1 != nil || er2 != nil { err = fmt.Errorf("wrong digits/decimals value %s/%s", d2, d1) goto end } fi.digits = int(v1) fi.decimals = int(v2) default: switch { case fieldType&IsIntegerField > 0: case fieldType&IsRelField > 0: } } if fieldType&IsIntegerField == 0 { if fi.auto { err = fmt.Errorf("non-integer type cannot set auto") goto end } } if fi.auto || fi.pk { if fi.auto { switch addrField.Elem().Kind() { case reflect.Int, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint32, reflect.Uint64: default: err = fmt.Errorf("auto primary key only support int, int32, int64, uint, uint32, uint64 but found `%s`", addrField.Elem().Kind()) goto end } fi.pk = true } fi.null = false fi.index = false fi.unique = false } if fi.unique { fi.index = false } if fi.auto || fi.pk || fi.unique || fieldType == TypeDateField || fieldType == TypeDateTimeField { // can not set default initial.Clear() } if initial.Exist() { v := initial switch fieldType { case TypeBooleanField: _, err = v.Bool() case TypeFloatField, TypeDecimalField: _, err = v.Float64() case TypeBitField: _, err = v.Int8() case TypeSmallIntegerField: _, err = v.Int16() case TypeIntegerField: _, err = v.Int32() case TypeBigIntegerField: _, err = v.Int64() case TypePositiveBitField: _, err = v.Uint8() case TypePositiveSmallIntegerField: _, err = v.Uint16() case TypePositiveIntegerField: _, err = v.Uint32() case TypePositiveBigIntegerField: _, err = v.Uint64() } if err != nil { tag, tagValue = "default", tags["default"] goto wrongTag } } fi.initial = initial end: if err != nil { return nil, err } return wrongTag: return nil, fmt.Errorf("wrong tag format: `%s:\"%s\"`, %s", tag, tagValue, err) }