mirror of https://github.com/go-gorm/gorm.git
121 lines
3.0 KiB
Go
121 lines
3.0 KiB
Go
package schema
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import (
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"fmt"
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"go/ast"
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"reflect"
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"strings"
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"sync"
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)
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type Schema struct {
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Name string
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ModelType reflect.Type
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Table string
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PrioritizedPrimaryField *Field
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PrimaryFields []*Field
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Fields []*Field
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FieldsByName map[string]*Field
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FieldsByDBName map[string]*Field
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Relationships Relationships
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err error
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namer Namer
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cacheStore sync.Map
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}
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func (schema Schema) String() string {
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return schema.ModelType.PkgPath()
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}
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func (schema Schema) LookUpField(name string) *Field {
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if field, ok := schema.FieldsByDBName[name]; ok {
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return field
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}
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if field, ok := schema.FieldsByName[name]; ok {
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return field
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}
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return nil
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}
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// get data type from dialector
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func Parse(dest interface{}, cacheStore sync.Map, namer Namer) (*Schema, error) {
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modelType := reflect.ValueOf(dest).Type()
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for modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Ptr {
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modelType = modelType.Elem()
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}
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if modelType.Kind() != reflect.Struct {
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if modelType.PkgPath() == "" {
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return nil, fmt.Errorf("unsupported data %+v when parsing model", dest)
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}
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return nil, fmt.Errorf("unsupported data type %v when parsing model", modelType.PkgPath())
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}
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if v, ok := cacheStore.Load(modelType); ok {
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return v.(*Schema), nil
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}
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schema := &Schema{
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Name: modelType.Name(),
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ModelType: modelType,
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Table: namer.TableName(modelType.Name()),
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FieldsByName: map[string]*Field{},
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FieldsByDBName: map[string]*Field{},
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cacheStore: cacheStore,
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}
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defer func() {
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if schema.err != nil {
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cacheStore.Delete(modelType)
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}
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}()
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for i := 0; i < modelType.NumField(); i++ {
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if fieldStruct := modelType.Field(i); ast.IsExported(fieldStruct.Name) {
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field := schema.ParseField(fieldStruct)
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schema.Fields = append(schema.Fields, field)
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if field.EmbeddedSchema != nil {
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schema.Fields = append(schema.Fields, field.EmbeddedSchema.Fields...)
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}
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}
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}
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for _, field := range schema.Fields {
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if field.DBName == "" {
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field.DBName = namer.ColumnName(field.Name)
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}
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if field.DBName != "" {
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// nonexistence or shortest path or first appear prioritized if has permission
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if v, ok := schema.FieldsByDBName[field.DBName]; !ok || (field.Creatable && len(field.BindNames) < len(v.BindNames)) {
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schema.FieldsByDBName[field.DBName] = field
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schema.FieldsByName[field.Name] = field
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}
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}
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if _, ok := schema.FieldsByName[field.Name]; !ok {
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schema.FieldsByName[field.Name] = field
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}
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}
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for db, field := range schema.FieldsByDBName {
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if strings.ToLower(db) == "id" {
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schema.PrioritizedPrimaryField = field
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}
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if field.PrimaryKey {
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if schema.PrioritizedPrimaryField == nil {
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schema.PrioritizedPrimaryField = field
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}
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schema.PrimaryFields = append(schema.PrimaryFields, field)
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}
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if field.DataType == "" {
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defer schema.parseRelation(field)
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}
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}
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cacheStore.Store(modelType, schema)
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return schema, schema.err
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}
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