mirror of https://github.com/go-gorm/gorm.git
359 lines
10 KiB
Go
359 lines
10 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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"regexp"
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"strconv"
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"strings"
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"time"
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)
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type ModelStruct struct {
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PrimaryKeyField *StructField
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StructFields []*StructField
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ModelType reflect.Type
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TableName string
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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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SqlTag string
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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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SqlTag: structField.SqlTag,
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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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ForeignFieldName string
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ForeignDBName string
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AssociationForeignFieldName string
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AssociationForeignDBName string
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JoinTable string
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}
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var pluralMapKeys = []*regexp.Regexp{regexp.MustCompile("ch$"), regexp.MustCompile("ss$"), regexp.MustCompile("sh$"), regexp.MustCompile("day$"), regexp.MustCompile("y$"), regexp.MustCompile("x$"), regexp.MustCompile("([^s])s?$")}
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var pluralMapValues = []string{"ches", "sses", "shes", "days", "ies", "xes", "${1}s"}
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func (scope *Scope) GetModelStruct(noRelationship ...bool) *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 scope.db != nil {
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if value, ok := scope.db.parent.ModelStructs[scopeType]; ok {
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return value
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}
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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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// Set tablename
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if fm := reflect.New(scopeType).MethodByName("TableName"); fm.IsValid() {
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if results := fm.Call([]reflect.Value{}); len(results) > 0 {
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if name, ok := results[0].Interface().(string); ok {
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modelStruct.TableName = name
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}
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}
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} else {
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modelStruct.TableName = ToDBName(scopeType.Name())
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if scope.db == nil || !scope.db.parent.singularTable {
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for index, reg := range pluralMapKeys {
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if reg.MatchString(modelStruct.TableName) {
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modelStruct.TableName = reg.ReplaceAllString(modelStruct.TableName, pluralMapValues[index])
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}
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}
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}
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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.PrimaryKeyField = 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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for _, field := range fields {
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if !field.IsIgnored {
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fieldStruct := field.Struct
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fieldType, indirectType := fieldStruct.Type, 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(fieldType).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 && len(noRelationship) == 0 {
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gormSettings := parseTagSetting(field.Tag.Get("gorm"))
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toModelStruct := scope.New(reflect.New(fieldStruct.Type).Interface()).GetModelStruct(true)
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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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foreignKey := gormSettings["FOREIGNKEY"]
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if polymorphic := gormSettings["POLYMORPHIC"]; polymorphic != "" {
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if polymorphicField := getForeignField(polymorphic+"Id", toModelStruct.StructFields); polymorphicField != nil {
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if polymorphicType := getForeignField(polymorphic+"Type", toModelStruct.StructFields); polymorphicType != nil {
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relationship.ForeignFieldName = polymorphicField.Name
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relationship.ForeignDBName = polymorphicField.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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switch indirectType.Kind() {
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case reflect.Slice:
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if len(toModelStruct.StructFields) > 0 {
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if foreignKey == "" {
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foreignKey = scopeType.Name() + "Id"
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}
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if many2many := gormSettings["MANY2MANY"]; many2many != "" {
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relationship.Kind = "many_to_many"
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relationship.JoinTable = many2many
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associationForeignKey := gormSettings["ASSOCIATIONFOREIGNKEY"]
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if associationForeignKey == "" {
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associationForeignKey = toModelStruct.ModelType.Name() + "Id"
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}
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relationship.ForeignFieldName = foreignKey
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relationship.ForeignDBName = ToDBName(foreignKey)
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relationship.AssociationForeignFieldName = associationForeignKey
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relationship.AssociationForeignDBName = ToDBName(associationForeignKey)
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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 foreignField := getForeignField(foreignKey, toModelStruct.StructFields); foreignField != nil {
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relationship.ForeignFieldName = foreignField.Name
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relationship.ForeignDBName = foreignField.DBName
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foreignField.IsForeignKey = true
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field.Relationship = relationship
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} else if relationship.ForeignFieldName != "" {
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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 _, f := range scope.New(reflect.New(indirectType).Interface()).GetStructFields() {
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f = f.clone()
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f.Names = append([]string{fieldStruct.Name}, f.Names...)
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modelStruct.StructFields = append(modelStruct.StructFields, f)
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}
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break
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} else {
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belongsToForeignKey := foreignKey
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if belongsToForeignKey == "" {
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belongsToForeignKey = field.Name + "Id"
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}
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if foreignField := getForeignField(belongsToForeignKey, fields); foreignField != nil {
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relationship.Kind = "belongs_to"
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relationship.ForeignFieldName = foreignField.Name
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relationship.ForeignDBName = foreignField.DBName
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foreignField.IsForeignKey = true
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field.Relationship = relationship
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} else {
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if foreignKey == "" {
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foreignKey = modelStruct.ModelType.Name() + "Id"
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}
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relationship.Kind = "has_one"
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if foreignField := getForeignField(foreignKey, toModelStruct.StructFields); foreignField != nil {
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relationship.ForeignFieldName = foreignField.Name
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relationship.ForeignDBName = foreignField.DBName
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foreignField.IsForeignKey = true
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field.Relationship = relationship
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} else if relationship.ForeignFieldName != "" {
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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 modelStruct.PrimaryKeyField == nil && field.DBName == "id" {
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field.IsPrimaryKey = true
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modelStruct.PrimaryKeyField = field
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}
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if scope.db != nil {
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scope.generateSqlTag(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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if scope.db != nil && len(noRelationship) == 0 {
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scope.db.parent.ModelStructs[scopeType] = &modelStruct
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}
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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) {
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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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if field.IsPrimaryKey {
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sqlType = scope.Dialect().PrimaryKeyTag(reflectValue, size)
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} else {
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sqlType = scope.Dialect().SqlTag(reflectValue, size)
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}
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}
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if strings.TrimSpace(additionalType) == "" {
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field.SqlTag = sqlType
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} else {
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field.SqlTag = 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] = 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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