mirror of
https://github.com/astaxie/beego.git
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149 lines
3.5 KiB
Go
149 lines
3.5 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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"fmt"
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"os"
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"reflect"
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)
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// single model info
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type modelInfo struct {
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pkg string
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name string
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fullName string
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table string
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model interface{}
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fields *fields
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manual bool
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addrField reflect.Value //store the original struct value
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uniques []string
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isThrough bool
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}
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// new model info
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func newModelInfo(val reflect.Value) (mi *modelInfo) {
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mi = &modelInfo{}
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mi.fields = newFields()
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ind := reflect.Indirect(val)
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mi.addrField = val
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mi.name = ind.Type().Name()
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mi.fullName = getFullName(ind.Type())
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addModelFields(mi, ind, "", []int{})
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return
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}
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// index: FieldByIndex returns the nested field corresponding to index
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func addModelFields(mi *modelInfo, ind reflect.Value, mName string, index []int) {
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var (
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err error
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fi *fieldInfo
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sf reflect.StructField
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)
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for i := 0; i < ind.NumField(); i++ {
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field := ind.Field(i)
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sf = ind.Type().Field(i)
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// if the field is unexported skip
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if sf.PkgPath != "" {
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continue
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}
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// add anonymous struct fields
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if sf.Anonymous {
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addModelFields(mi, field, mName+"."+sf.Name, append(index, i))
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continue
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}
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fi, err = newFieldInfo(mi, field, sf, mName)
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if err == errSkipField {
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err = nil
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continue
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} else if err != nil {
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break
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}
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//record current field index
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fi.fieldIndex = append(fi.fieldIndex, index...)
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fi.fieldIndex = append(fi.fieldIndex, i)
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fi.mi = mi
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fi.inModel = true
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if !mi.fields.Add(fi) {
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err = fmt.Errorf("duplicate column name: %s", fi.column)
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break
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}
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if fi.pk {
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if mi.fields.pk != nil {
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err = fmt.Errorf("one model must have one pk field only")
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break
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} else {
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mi.fields.pk = fi
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}
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}
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}
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if err != nil {
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fmt.Println(fmt.Errorf("field: %s.%s, %s", ind.Type(), sf.Name, err))
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os.Exit(2)
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}
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}
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// combine related model info to new model info.
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// prepare for relation models query.
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func newM2MModelInfo(m1, m2 *modelInfo) (mi *modelInfo) {
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mi = new(modelInfo)
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mi.fields = newFields()
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mi.table = m1.table + "_" + m2.table + "s"
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mi.name = camelString(mi.table)
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mi.fullName = m1.pkg + "." + mi.name
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fa := new(fieldInfo) // pk
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f1 := new(fieldInfo) // m1 table RelForeignKey
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f2 := new(fieldInfo) // m2 table RelForeignKey
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fa.fieldType = TypeBigIntegerField
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fa.auto = true
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fa.pk = true
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fa.dbcol = true
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fa.name = "Id"
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fa.column = "id"
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fa.fullName = mi.fullName + "." + fa.name
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f1.dbcol = true
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f2.dbcol = true
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f1.fieldType = RelForeignKey
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f2.fieldType = RelForeignKey
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f1.name = camelString(m1.table)
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f2.name = camelString(m2.table)
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f1.fullName = mi.fullName + "." + f1.name
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f2.fullName = mi.fullName + "." + f2.name
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f1.column = m1.table + "_id"
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f2.column = m2.table + "_id"
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f1.rel = true
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f2.rel = true
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f1.relTable = m1.table
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f2.relTable = m2.table
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f1.relModelInfo = m1
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f2.relModelInfo = m2
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f1.mi = mi
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f2.mi = mi
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mi.fields.Add(fa)
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mi.fields.Add(f1)
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mi.fields.Add(f2)
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mi.fields.pk = fa
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mi.uniques = []string{f1.column, f2.column}
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return
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}
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