mirror of https://github.com/go-gorm/gorm.git
467 lines
16 KiB
Go
467 lines
16 KiB
Go
package gorm
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import (
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"database/sql"
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"fmt"
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"go/ast"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/qor/inflection"
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)
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var DefaultTableNameHandler = func(db *DB, defaultTableName string) string {
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return defaultTableName
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}
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type safeModelStructsMap struct {
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m map[reflect.Type]*ModelStruct
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l *sync.RWMutex
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}
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func (s *safeModelStructsMap) Set(key reflect.Type, value *ModelStruct) {
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s.l.Lock()
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defer s.l.Unlock()
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s.m[key] = value
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}
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func (s *safeModelStructsMap) Get(key reflect.Type) *ModelStruct {
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s.l.RLock()
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defer s.l.RUnlock()
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return s.m[key]
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}
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func newModelStructsMap() *safeModelStructsMap {
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return &safeModelStructsMap{l: new(sync.RWMutex), m: make(map[reflect.Type]*ModelStruct)}
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}
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var modelStructsMap = newModelStructsMap()
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type ModelStruct struct {
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PrimaryFields []*StructField
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StructFields []*StructField
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ModelType reflect.Type
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defaultTableName string
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cached bool
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}
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func (s ModelStruct) TableName(db *DB) string {
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return DefaultTableNameHandler(db, s.defaultTableName)
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}
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type StructField struct {
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DBName string
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Name string
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Names []string
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IsPrimaryKey bool
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IsNormal bool
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IsIgnored bool
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IsScanner bool
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HasDefaultValue bool
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Tag reflect.StructTag
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Struct reflect.StructField
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IsForeignKey bool
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Relationship *Relationship
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}
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func (structField *StructField) clone() *StructField {
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return &StructField{
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DBName: structField.DBName,
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Name: structField.Name,
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Names: structField.Names,
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IsPrimaryKey: structField.IsPrimaryKey,
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IsNormal: structField.IsNormal,
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IsIgnored: structField.IsIgnored,
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IsScanner: structField.IsScanner,
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HasDefaultValue: structField.HasDefaultValue,
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Tag: structField.Tag,
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Struct: structField.Struct,
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IsForeignKey: structField.IsForeignKey,
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Relationship: structField.Relationship,
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}
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}
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type Relationship struct {
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Kind string
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PolymorphicType string
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PolymorphicDBName string
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ForeignFieldNames []string
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ForeignDBNames []string
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AssociationForeignFieldNames []string
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AssociationForeignStructFieldNames []string
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AssociationForeignDBNames []string
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JoinTableHandler JoinTableHandlerInterface
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}
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func (scope *Scope) GetModelStruct() *ModelStruct {
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var modelStruct ModelStruct
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reflectValue := reflect.Indirect(reflect.ValueOf(scope.Value))
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if !reflectValue.IsValid() {
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return &modelStruct
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}
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if reflectValue.Kind() == reflect.Slice {
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reflectValue = reflect.Indirect(reflect.New(reflectValue.Type().Elem()))
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}
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scopeType := reflectValue.Type()
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if scopeType.Kind() == reflect.Ptr {
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scopeType = scopeType.Elem()
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}
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if value := modelStructsMap.Get(scopeType); value != nil {
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return value
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}
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modelStruct.ModelType = scopeType
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if scopeType.Kind() != reflect.Struct {
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return &modelStruct
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}
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if tabler, ok := reflect.New(scopeType).Interface().(interface {
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TableName() string
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}); ok {
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modelStruct.defaultTableName = tabler.TableName()
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} else {
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name := ToDBName(scopeType.Name())
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if scope.db == nil || !scope.db.parent.singularTable {
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name = inflection.Plural(name)
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}
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modelStruct.defaultTableName = name
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}
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// Get all fields
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fields := []*StructField{}
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for i := 0; i < scopeType.NumField(); i++ {
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if fieldStruct := scopeType.Field(i); ast.IsExported(fieldStruct.Name) {
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field := &StructField{
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Struct: fieldStruct,
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Name: fieldStruct.Name,
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Names: []string{fieldStruct.Name},
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Tag: fieldStruct.Tag,
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}
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if fieldStruct.Tag.Get("sql") == "-" {
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field.IsIgnored = true
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} else {
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sqlSettings := parseTagSetting(field.Tag.Get("sql"))
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gormSettings := parseTagSetting(field.Tag.Get("gorm"))
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if _, ok := gormSettings["PRIMARY_KEY"]; ok {
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field.IsPrimaryKey = true
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modelStruct.PrimaryFields = append(modelStruct.PrimaryFields, field)
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}
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if _, ok := sqlSettings["DEFAULT"]; ok {
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field.HasDefaultValue = true
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}
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if value, ok := gormSettings["COLUMN"]; ok {
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field.DBName = value
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} else {
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field.DBName = ToDBName(fieldStruct.Name)
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}
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}
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fields = append(fields, field)
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}
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}
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var finished = make(chan bool)
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go func(finished chan bool) {
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for _, field := range fields {
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if !field.IsIgnored {
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fieldStruct := field.Struct
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indirectType := fieldStruct.Type
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if indirectType.Kind() == reflect.Ptr {
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indirectType = indirectType.Elem()
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}
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if _, isScanner := reflect.New(indirectType).Interface().(sql.Scanner); isScanner {
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field.IsScanner, field.IsNormal = true, true
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}
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if _, isTime := reflect.New(indirectType).Interface().(*time.Time); isTime {
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field.IsNormal = true
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}
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if !field.IsNormal {
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gormSettings := parseTagSetting(field.Tag.Get("gorm"))
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toScope := scope.New(reflect.New(fieldStruct.Type).Interface())
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getForeignField := func(column string, fields []*StructField) *StructField {
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for _, field := range fields {
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if field.Name == column || field.DBName == ToDBName(column) {
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return field
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}
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}
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return nil
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}
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var relationship = &Relationship{}
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if polymorphic := gormSettings["POLYMORPHIC"]; polymorphic != "" {
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if polymorphicField := getForeignField(polymorphic+"Id", toScope.GetStructFields()); polymorphicField != nil {
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if polymorphicType := getForeignField(polymorphic+"Type", toScope.GetStructFields()); polymorphicType != nil {
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relationship.ForeignFieldNames = []string{polymorphicField.Name}
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relationship.ForeignDBNames = []string{polymorphicField.DBName}
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relationship.AssociationForeignFieldNames = []string{scope.PrimaryField().Name}
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relationship.AssociationForeignDBNames = []string{scope.PrimaryField().DBName}
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relationship.PolymorphicType = polymorphicType.Name
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relationship.PolymorphicDBName = polymorphicType.DBName
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polymorphicType.IsForeignKey = true
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polymorphicField.IsForeignKey = true
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}
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}
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}
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var foreignKeys []string
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if foreignKey, ok := gormSettings["FOREIGNKEY"]; ok {
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foreignKeys = append(foreignKeys, foreignKey)
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}
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switch indirectType.Kind() {
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case reflect.Slice:
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elemType := indirectType.Elem()
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if elemType.Kind() == reflect.Ptr {
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elemType = elemType.Elem()
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}
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if elemType.Kind() == reflect.Struct {
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if many2many := gormSettings["MANY2MANY"]; many2many != "" {
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relationship.Kind = "many_to_many"
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// foreign keys
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if len(foreignKeys) == 0 {
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for _, field := range scope.PrimaryFields() {
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foreignKeys = append(foreignKeys, field.DBName)
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}
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}
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for _, foreignKey := range foreignKeys {
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if field, ok := scope.FieldByName(foreignKey); ok {
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, field.DBName)
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joinTableDBName := ToDBName(scopeType.Name()) + "_" + field.DBName
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, joinTableDBName)
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}
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}
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// association foreign keys
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var associationForeignKeys []string
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if foreignKey := gormSettings["ASSOCIATIONFOREIGNKEY"]; foreignKey != "" {
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associationForeignKeys = []string{gormSettings["ASSOCIATIONFOREIGNKEY"]}
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} else {
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for _, field := range toScope.PrimaryFields() {
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associationForeignKeys = append(associationForeignKeys, field.DBName)
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}
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}
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for _, name := range associationForeignKeys {
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if field, ok := toScope.FieldByName(name); ok {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, field.DBName)
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relationship.AssociationForeignStructFieldNames = append(relationship.AssociationForeignFieldNames, field.Name)
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joinTableDBName := ToDBName(elemType.Name()) + "_" + field.DBName
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, joinTableDBName)
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}
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}
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joinTableHandler := JoinTableHandler{}
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joinTableHandler.Setup(relationship, many2many, scopeType, elemType)
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relationship.JoinTableHandler = &joinTableHandler
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field.Relationship = relationship
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} else {
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relationship.Kind = "has_many"
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if len(foreignKeys) == 0 {
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for _, field := range scope.PrimaryFields() {
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if foreignField := getForeignField(scopeType.Name()+field.Name, toScope.GetStructFields()); foreignField != nil {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, field.Name)
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, field.DBName)
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, foreignField.Name)
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, foreignField.DBName)
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foreignField.IsForeignKey = true
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}
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}
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} else {
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for _, foreignKey := range foreignKeys {
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if foreignField := getForeignField(foreignKey, toScope.GetStructFields()); foreignField != nil {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, scope.PrimaryField().Name)
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, scope.PrimaryField().DBName)
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, foreignField.Name)
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, foreignField.DBName)
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foreignField.IsForeignKey = true
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}
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}
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}
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if len(relationship.ForeignFieldNames) != 0 {
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field.Relationship = relationship
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}
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}
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} else {
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field.IsNormal = true
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}
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case reflect.Struct:
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if _, ok := gormSettings["EMBEDDED"]; ok || fieldStruct.Anonymous {
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for _, toField := range toScope.GetStructFields() {
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toField = toField.clone()
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toField.Names = append([]string{fieldStruct.Name}, toField.Names...)
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modelStruct.StructFields = append(modelStruct.StructFields, toField)
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if toField.IsPrimaryKey {
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modelStruct.PrimaryFields = append(modelStruct.PrimaryFields, toField)
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}
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}
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continue
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} else {
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if len(foreignKeys) == 0 {
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for _, f := range scope.PrimaryFields() {
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if foreignField := getForeignField(modelStruct.ModelType.Name()+f.Name, toScope.GetStructFields()); foreignField != nil {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, f.Name)
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, f.DBName)
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, foreignField.Name)
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, foreignField.DBName)
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foreignField.IsForeignKey = true
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}
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}
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} else {
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for _, foreignKey := range foreignKeys {
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if foreignField := getForeignField(foreignKey, toScope.GetStructFields()); foreignField != nil {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, scope.PrimaryField().Name)
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, scope.PrimaryField().DBName)
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, foreignField.Name)
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, foreignField.DBName)
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foreignField.IsForeignKey = true
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}
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}
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}
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if len(relationship.ForeignFieldNames) != 0 {
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relationship.Kind = "has_one"
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field.Relationship = relationship
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} else {
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if len(foreignKeys) == 0 {
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for _, f := range toScope.PrimaryFields() {
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if foreignField := getForeignField(field.Name+f.Name, fields); foreignField != nil {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, f.Name)
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, f.DBName)
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, foreignField.Name)
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, foreignField.DBName)
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foreignField.IsForeignKey = true
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}
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}
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} else {
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for _, foreignKey := range foreignKeys {
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if foreignField := getForeignField(foreignKey, fields); foreignField != nil {
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relationship.AssociationForeignFieldNames = append(relationship.AssociationForeignFieldNames, toScope.PrimaryField().Name)
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relationship.AssociationForeignDBNames = append(relationship.AssociationForeignDBNames, toScope.PrimaryField().DBName)
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relationship.ForeignFieldNames = append(relationship.ForeignFieldNames, foreignField.Name)
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relationship.ForeignDBNames = append(relationship.ForeignDBNames, foreignField.DBName)
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foreignField.IsForeignKey = true
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}
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}
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}
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if len(relationship.ForeignFieldNames) != 0 {
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relationship.Kind = "belongs_to"
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field.Relationship = relationship
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}
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}
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}
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default:
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field.IsNormal = true
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}
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}
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if field.IsNormal {
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if len(modelStruct.PrimaryFields) == 0 && field.DBName == "id" {
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field.IsPrimaryKey = true
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modelStruct.PrimaryFields = append(modelStruct.PrimaryFields, field)
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}
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}
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}
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modelStruct.StructFields = append(modelStruct.StructFields, field)
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}
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finished <- true
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}(finished)
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modelStructsMap.Set(scopeType, &modelStruct)
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<-finished
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modelStruct.cached = true
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return &modelStruct
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}
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func (scope *Scope) GetStructFields() (fields []*StructField) {
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return scope.GetModelStruct().StructFields
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}
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func (scope *Scope) generateSqlTag(field *StructField) string {
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var sqlType string
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structType := field.Struct.Type
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if structType.Kind() == reflect.Ptr {
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structType = structType.Elem()
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}
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reflectValue := reflect.Indirect(reflect.New(structType))
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sqlSettings := parseTagSetting(field.Tag.Get("sql"))
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if value, ok := sqlSettings["TYPE"]; ok {
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sqlType = value
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}
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additionalType := sqlSettings["NOT NULL"] + " " + sqlSettings["UNIQUE"]
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if value, ok := sqlSettings["DEFAULT"]; ok {
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additionalType = additionalType + " DEFAULT " + value
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}
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if field.IsScanner {
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var getScannerValue func(reflect.Value)
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getScannerValue = func(value reflect.Value) {
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reflectValue = value
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if _, isScanner := reflect.New(reflectValue.Type()).Interface().(sql.Scanner); isScanner && reflectValue.Kind() == reflect.Struct {
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getScannerValue(reflectValue.Field(0))
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}
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}
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getScannerValue(reflectValue)
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}
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if sqlType == "" {
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var size = 255
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if value, ok := sqlSettings["SIZE"]; ok {
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size, _ = strconv.Atoi(value)
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}
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_, autoIncrease := sqlSettings["AUTO_INCREMENT"]
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if field.IsPrimaryKey {
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autoIncrease = true
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}
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sqlType = scope.Dialect().SqlTag(reflectValue, size, autoIncrease)
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}
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if strings.TrimSpace(additionalType) == "" {
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return sqlType
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} else {
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return fmt.Sprintf("%v %v", sqlType, additionalType)
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}
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}
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func parseTagSetting(str string) map[string]string {
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tags := strings.Split(str, ";")
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setting := map[string]string{}
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for _, value := range tags {
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v := strings.Split(value, ":")
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k := strings.TrimSpace(strings.ToUpper(v[0]))
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if len(v) >= 2 {
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setting[k] = strings.Join(v[1:], ":")
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} else {
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setting[k] = k
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}
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}
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return setting
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}
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