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Beego/orm/models_info_f.go
2014-01-17 23:28:54 +08:00

428 lines
9.5 KiB
Go

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)
}