329 lines
8.1 KiB
Go
329 lines
8.1 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package orm
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import (
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"errors"
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"fmt"
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"os"
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"reflect"
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"strings"
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)
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// register models.
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// prefix means table name prefix.
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func registerModel(prefix string, model interface{}) {
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val := reflect.ValueOf(model)
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ind := reflect.Indirect(val)
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typ := ind.Type()
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if val.Kind() != reflect.Ptr {
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panic(fmt.Errorf("<orm.RegisterModel> cannot use non-ptr model struct `%s`", getFullName(typ)))
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}
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table := getTableName(val)
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if prefix != "" {
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table = prefix + table
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}
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name := getFullName(typ)
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if _, ok := modelCache.getByFN(name); ok {
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fmt.Printf("<orm.RegisterModel> model `%s` repeat register, must be unique\n", name)
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os.Exit(2)
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}
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if _, ok := modelCache.get(table); ok {
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fmt.Printf("<orm.RegisterModel> table name `%s` repeat register, must be unique\n", table)
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os.Exit(2)
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}
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info := newModelInfo(val)
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if info.fields.pk == nil {
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outFor:
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for _, fi := range info.fields.fieldsDB {
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if strings.ToLower(fi.name) == "id" {
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switch fi.addrValue.Elem().Kind() {
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case reflect.Int, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint32, reflect.Uint64:
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fi.auto = true
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fi.pk = true
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info.fields.pk = fi
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break outFor
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}
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}
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}
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if info.fields.pk == nil {
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fmt.Printf("<orm.RegisterModel> `%s` need a primary key field\n", name)
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os.Exit(2)
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}
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}
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info.table = table
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info.pkg = typ.PkgPath()
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info.model = model
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info.manual = true
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modelCache.set(table, info)
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}
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// boostrap models
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func bootStrap() {
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if modelCache.done {
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return
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}
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var (
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err error
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models map[string]*modelInfo
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)
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if dataBaseCache.getDefault() == nil {
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err = fmt.Errorf("must have one register DataBase alias named `default`")
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goto end
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}
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models = modelCache.all()
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for _, mi := range models {
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for _, fi := range mi.fields.columns {
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if fi.rel || fi.reverse {
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elm := fi.addrValue.Type().Elem()
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switch fi.fieldType {
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case RelReverseMany, RelManyToMany:
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elm = elm.Elem()
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}
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name := getFullName(elm)
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mii, ok := modelCache.getByFN(name)
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if ok == false || mii.pkg != elm.PkgPath() {
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err = fmt.Errorf("can not found rel in field `%s`, `%s` may be miss register", fi.fullName, elm.String())
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goto end
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}
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fi.relModelInfo = mii
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switch fi.fieldType {
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case RelManyToMany:
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if fi.relThrough != "" {
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msg := fmt.Sprintf("field `%s` wrong rel_through value `%s`", fi.fullName, fi.relThrough)
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if i := strings.LastIndex(fi.relThrough, "."); i != -1 && len(fi.relThrough) > (i+1) {
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pn := fi.relThrough[:i]
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rmi, ok := modelCache.getByFN(fi.relThrough)
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if ok == false || pn != rmi.pkg {
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err = errors.New(msg + " cannot find table")
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goto end
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}
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fi.relThroughModelInfo = rmi
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fi.relTable = rmi.table
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} else {
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err = errors.New(msg)
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goto end
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}
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} else {
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i := newM2MModelInfo(mi, mii)
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if fi.relTable != "" {
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i.table = fi.relTable
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}
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if v := modelCache.set(i.table, i); v != nil {
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err = fmt.Errorf("the rel table name `%s` already registered, cannot be use, please change one", fi.relTable)
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goto end
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}
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fi.relTable = i.table
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fi.relThroughModelInfo = i
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}
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fi.relThroughModelInfo.isThrough = true
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}
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}
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}
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}
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models = modelCache.all()
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for _, mi := range models {
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for _, fi := range mi.fields.fieldsRel {
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switch fi.fieldType {
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case RelForeignKey, RelOneToOne, RelManyToMany:
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inModel := false
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for _, ffi := range fi.relModelInfo.fields.fieldsReverse {
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if ffi.relModelInfo == mi {
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inModel = true
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break
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}
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}
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if inModel == false {
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rmi := fi.relModelInfo
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ffi := new(fieldInfo)
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ffi.name = mi.name
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ffi.column = ffi.name
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ffi.fullName = rmi.fullName + "." + ffi.name
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ffi.reverse = true
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ffi.relModelInfo = mi
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ffi.mi = rmi
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if fi.fieldType == RelOneToOne {
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ffi.fieldType = RelReverseOne
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} else {
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ffi.fieldType = RelReverseMany
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}
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if rmi.fields.Add(ffi) == false {
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added := false
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for cnt := 0; cnt < 5; cnt++ {
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ffi.name = fmt.Sprintf("%s%d", mi.name, cnt)
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ffi.column = ffi.name
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ffi.fullName = rmi.fullName + "." + ffi.name
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if added = rmi.fields.Add(ffi); added {
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break
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}
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}
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if added == false {
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panic(fmt.Errorf("cannot generate auto reverse field info `%s` to `%s`", fi.fullName, ffi.fullName))
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}
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}
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}
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}
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}
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}
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models = modelCache.all()
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for _, mi := range models {
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for _, fi := range mi.fields.fieldsRel {
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switch fi.fieldType {
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case RelManyToMany:
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for _, ffi := range fi.relThroughModelInfo.fields.fieldsRel {
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switch ffi.fieldType {
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case RelOneToOne, RelForeignKey:
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if ffi.relModelInfo == fi.relModelInfo {
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fi.reverseFieldInfoTwo = ffi
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}
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if ffi.relModelInfo == mi {
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fi.reverseField = ffi.name
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fi.reverseFieldInfo = ffi
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}
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}
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}
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if fi.reverseFieldInfoTwo == nil {
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err = fmt.Errorf("can not find m2m field for m2m model `%s`, ensure your m2m model defined correct",
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fi.relThroughModelInfo.fullName)
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goto end
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}
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}
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}
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}
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models = modelCache.all()
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for _, mi := range models {
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for _, fi := range mi.fields.fieldsReverse {
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switch fi.fieldType {
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case RelReverseOne:
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found := false
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mForA:
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for _, ffi := range fi.relModelInfo.fields.fieldsByType[RelOneToOne] {
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if ffi.relModelInfo == mi {
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found = true
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fi.reverseField = ffi.name
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fi.reverseFieldInfo = ffi
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ffi.reverseField = fi.name
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ffi.reverseFieldInfo = fi
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break mForA
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}
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}
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if found == false {
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err = fmt.Errorf("reverse field `%s` not found in model `%s`", fi.fullName, fi.relModelInfo.fullName)
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goto end
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}
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case RelReverseMany:
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found := false
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mForB:
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for _, ffi := range fi.relModelInfo.fields.fieldsByType[RelForeignKey] {
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if ffi.relModelInfo == mi {
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found = true
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fi.reverseField = ffi.name
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fi.reverseFieldInfo = ffi
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ffi.reverseField = fi.name
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ffi.reverseFieldInfo = fi
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break mForB
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}
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}
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if found == false {
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mForC:
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for _, ffi := range fi.relModelInfo.fields.fieldsByType[RelManyToMany] {
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conditions := fi.relThrough != "" && fi.relThrough == ffi.relThrough ||
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fi.relTable != "" && fi.relTable == ffi.relTable ||
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fi.relThrough == "" && fi.relTable == ""
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if ffi.relModelInfo == mi && conditions {
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found = true
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fi.reverseField = ffi.reverseFieldInfoTwo.name
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fi.reverseFieldInfo = ffi.reverseFieldInfoTwo
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fi.relThroughModelInfo = ffi.relThroughModelInfo
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fi.reverseFieldInfoTwo = ffi.reverseFieldInfo
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fi.reverseFieldInfoM2M = ffi
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ffi.reverseFieldInfoM2M = fi
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break mForC
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}
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}
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}
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if found == false {
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err = fmt.Errorf("reverse field for `%s` not found in model `%s`", fi.fullName, fi.relModelInfo.fullName)
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goto end
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}
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}
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}
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}
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end:
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if err != nil {
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fmt.Println(err)
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os.Exit(2)
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}
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}
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// RegisterModel register models
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func RegisterModel(models ...interface{}) {
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RegisterModelWithPrefix("", models...)
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}
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// RegisterModelWithPrefix register models with a prefix
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func RegisterModelWithPrefix(prefix string, models ...interface{}) {
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if modelCache.done {
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panic(fmt.Errorf("RegisterModel must be run before BootStrap"))
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}
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for _, model := range models {
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registerModel(prefix, model)
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}
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}
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// BootStrap bootrap models.
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// make all model parsed and can not add more models
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func BootStrap() {
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if modelCache.done {
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return
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}
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modelCache.Lock()
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defer modelCache.Unlock()
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bootStrap()
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modelCache.done = true
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}
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