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schema.go
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schema.go
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package schema
import (
"context"
"errors"
"fmt"
"go/ast"
"reflect"
"sync"
"gorm.io/gorm/clause"
"gorm.io/gorm/logger"
)
// ErrUnsupportedDataType unsupported data type
var ErrUnsupportedDataType = errors.New("unsupported data type")
type Schema struct {
Name string
ModelType reflect.Type
Table string
PrioritizedPrimaryField *Field
DBNames []string
PrimaryFields []*Field
PrimaryFieldDBNames []string
Fields []*Field
FieldsByName map[string]*Field
FieldsByDBName map[string]*Field
FieldsWithDefaultDBValue []*Field // fields with default value assigned by database
Relationships Relationships
CreateClauses []clause.Interface
QueryClauses []clause.Interface
UpdateClauses []clause.Interface
DeleteClauses []clause.Interface
BeforeCreate, AfterCreate bool
BeforeUpdate, AfterUpdate bool
BeforeDelete, AfterDelete bool
BeforeSave, AfterSave bool
AfterFind bool
err error
namer Namer
cacheStore *sync.Map
}
func (schema Schema) String() string {
if schema.ModelType.Name() == "" {
return fmt.Sprintf("%v(%v)", schema.Name, schema.Table)
}
return fmt.Sprintf("%v.%v", schema.ModelType.PkgPath(), schema.ModelType.Name())
}
func (schema Schema) MakeSlice() reflect.Value {
slice := reflect.MakeSlice(reflect.SliceOf(reflect.PtrTo(schema.ModelType)), 0, 0)
results := reflect.New(slice.Type())
results.Elem().Set(slice)
return results
}
func (schema Schema) LookUpField(name string) *Field {
if field, ok := schema.FieldsByDBName[name]; ok {
return field
}
if field, ok := schema.FieldsByName[name]; ok {
return field
}
return nil
}
type Tabler interface {
TableName() string
}
// get data type from dialector
func Parse(dest interface{}, cacheStore *sync.Map, namer Namer) (*Schema, error) {
if dest == nil {
return nil, fmt.Errorf("%w: %+v", ErrUnsupportedDataType, dest)
}
modelType := reflect.ValueOf(dest).Type()
for modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Array || modelType.Kind() == reflect.Ptr {
modelType = modelType.Elem()
}
if modelType.Kind() != reflect.Struct {
if modelType.PkgPath() == "" {
return nil, fmt.Errorf("%w: %+v", ErrUnsupportedDataType, dest)
}
return nil, fmt.Errorf("%w: %v.%v", ErrUnsupportedDataType, modelType.PkgPath(), modelType.Name())
}
if v, ok := cacheStore.Load(modelType); ok {
return v.(*Schema), nil
}
modelValue := reflect.New(modelType)
tableName := namer.TableName(modelType.Name())
if tabler, ok := modelValue.Interface().(Tabler); ok {
tableName = tabler.TableName()
}
schema := &Schema{
Name: modelType.Name(),
ModelType: modelType,
Table: tableName,
FieldsByName: map[string]*Field{},
FieldsByDBName: map[string]*Field{},
Relationships: Relationships{Relations: map[string]*Relationship{}},
cacheStore: cacheStore,
namer: namer,
}
defer func() {
if schema.err != nil {
logger.Default.Error(context.Background(), schema.err.Error())
cacheStore.Delete(modelType)
}
}()
for i := 0; i < modelType.NumField(); i++ {
if fieldStruct := modelType.Field(i); ast.IsExported(fieldStruct.Name) {
if field := schema.ParseField(fieldStruct); field.EmbeddedSchema != nil {
schema.Fields = append(schema.Fields, field.EmbeddedSchema.Fields...)
} else {
schema.Fields = append(schema.Fields, field)
}
}
}
for _, field := range schema.Fields {
if field.DBName == "" && field.DataType != "" {
field.DBName = namer.ColumnName(schema.Table, field.Name)
}
if field.DBName != "" {
// nonexistence or shortest path or first appear prioritized if has permission
if v, ok := schema.FieldsByDBName[field.DBName]; !ok || (field.Creatable && len(field.BindNames) < len(v.BindNames)) {
if _, ok := schema.FieldsByDBName[field.DBName]; !ok {
schema.DBNames = append(schema.DBNames, field.DBName)
}
schema.FieldsByDBName[field.DBName] = field
schema.FieldsByName[field.Name] = field
if v != nil && v.PrimaryKey {
for idx, f := range schema.PrimaryFields {
if f == v {
schema.PrimaryFields = append(schema.PrimaryFields[0:idx], schema.PrimaryFields[idx+1:]...)
}
}
}
if field.PrimaryKey {
schema.PrimaryFields = append(schema.PrimaryFields, field)
}
}
}
if _, ok := schema.FieldsByName[field.Name]; !ok {
schema.FieldsByName[field.Name] = field
}
field.setupValuerAndSetter()
}
if f := schema.LookUpField("id"); f != nil {
if f.PrimaryKey {
schema.PrioritizedPrimaryField = f
} else if len(schema.PrimaryFields) == 0 {
f.PrimaryKey = true
schema.PrioritizedPrimaryField = f
schema.PrimaryFields = append(schema.PrimaryFields, f)
}
}
if schema.PrioritizedPrimaryField == nil && len(schema.PrimaryFields) == 1 {
schema.PrioritizedPrimaryField = schema.PrimaryFields[0]
}
for _, field := range schema.PrimaryFields {
schema.PrimaryFieldDBNames = append(schema.PrimaryFieldDBNames, field.DBName)
}
for _, field := range schema.FieldsByDBName {
if field.HasDefaultValue && field.DefaultValueInterface == nil {
schema.FieldsWithDefaultDBValue = append(schema.FieldsWithDefaultDBValue, field)
}
}
if field := schema.PrioritizedPrimaryField; field != nil {
switch field.GORMDataType {
case Int, Uint:
if _, ok := field.TagSettings["AUTOINCREMENT"]; !ok {
if !field.HasDefaultValue || field.DefaultValueInterface != nil {
schema.FieldsWithDefaultDBValue = append(schema.FieldsWithDefaultDBValue, field)
}
field.HasDefaultValue = true
field.AutoIncrement = true
}
}
}
callbacks := []string{"BeforeCreate", "AfterCreate", "BeforeUpdate", "AfterUpdate", "BeforeSave", "AfterSave", "BeforeDelete", "AfterDelete", "AfterFind"}
for _, name := range callbacks {
if methodValue := modelValue.MethodByName(name); methodValue.IsValid() {
switch methodValue.Type().String() {
case "func(*gorm.DB) error": // TODO hack
reflect.Indirect(reflect.ValueOf(schema)).FieldByName(name).SetBool(true)
default:
logger.Default.Warn(context.Background(), "Model %v don't match %vInterface, should be %v(*gorm.DB)", schema, name, name)
}
}
}
if _, loaded := cacheStore.LoadOrStore(modelType, schema); !loaded {
if _, embedded := schema.cacheStore.Load(embeddedCacheKey); !embedded {
for _, field := range schema.Fields {
if field.DataType == "" && field.Creatable {
if schema.parseRelation(field); schema.err != nil {
return schema, schema.err
}
}
fieldValue := reflect.New(field.IndirectFieldType)
if fc, ok := fieldValue.Interface().(CreateClausesInterface); ok {
field.Schema.CreateClauses = append(field.Schema.CreateClauses, fc.CreateClauses(field)...)
}
if fc, ok := fieldValue.Interface().(QueryClausesInterface); ok {
field.Schema.QueryClauses = append(field.Schema.QueryClauses, fc.QueryClauses(field)...)
}
if fc, ok := fieldValue.Interface().(UpdateClausesInterface); ok {
field.Schema.UpdateClauses = append(field.Schema.UpdateClauses, fc.UpdateClauses(field)...)
}
if fc, ok := fieldValue.Interface().(DeleteClausesInterface); ok {
field.Schema.DeleteClauses = append(field.Schema.DeleteClauses, fc.DeleteClauses(field)...)
}
}
}
}
return schema, schema.err
}