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model.go
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model.go
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package norm
import (
"database/sql"
"errors"
"fmt"
"github.com/gocraft/dbr"
"github.com/picatic/norm/field"
"reflect"
)
var (
fieldType = reflect.TypeOf((*field.Field)(nil)).Elem()
modelType = reflect.TypeOf((*Model)(nil)).Elem()
)
// Model This interface provides basic information to help with building queries and behaviours in dbr.
type Model interface {
// TableName is the name used in the name used in database.
//
// Typically implemented to return in storage table name
//
// // TableName returns database table name
// func (u *User) TableName() string {
// return "norm_users"
// }
TableName() string
// PrimaryKey returns a PrimaryKeyer which can be one of a few provided implementations
//
// // PrimaryKey returns SinglePrimaryKey
// func (u *User) PrimaryKey() PrimaryKeyer {
// return norm.NewSinglePrimaryKey(field.Name("Id"))
// }
//
// // PrimaryKey returns Composite Key as MultiplePrimaryKey
// func (u *User) PrimaryKey() PrimaryKeyer {
// return norm.NewMultiplePrimaryKey(field.Names{"OrgId", "AccountId"})
// }
//
// // PrimaryKey returns CustomPrimaryKey example for generating a uuid
// func (t OauthAccessToken) PrimaryKey() norm.PrimaryKeyer {
// return norm.NewCustomPrimaryKey(Names{"Id"}, func(pk norm.PrimaryKeyer, model norm.Model) (Names, error) {
// f, _ := norm.ModelGetField(model, "Id")
// f.Scan(newUuid())
// return Names{"Id"}, nil
// })
// }
//
// Must not be called more than once and should only be done by norm.
PrimaryKey() PrimaryKeyer
// IsNew returns if the the model does not already exist in storage.
// The Primarykey on the model should not be Valid.
//
// Typically this can be implemented as
//
// // IsNew indicates that model instance does not already exist.
// func (u *User) IsNew() bool {
// return !u.Id.Valid
// }
IsNew() bool
}
// ModelFields Fetch list of fields on this model via reflection of fields that are from norm/field
// If model fails to be a Ptr to a Struct we return an error
func ModelFields(model Model) field.Names {
modelType := reflect.TypeOf(model)
if modelType.Kind() != reflect.Ptr {
panic("Expected Model to be a Ptr")
}
if modelType.Elem().Kind() != reflect.Struct {
panic("Expected Model to be a Ptr to a Struct")
}
return modelFields(model)
}
func modelFields(model interface{}) field.Names {
fields := make(field.Names, 0)
// Value of model
ifv := reflect.ValueOf(model)
if ifv.Kind() == reflect.Ptr {
ifv = ifv.Elem()
}
// Type of Model
itf := reflect.TypeOf(model)
if itf.Kind() == reflect.Ptr {
itf = itf.Elem()
}
for i := 0; i < itf.NumField(); i++ {
v := ifv.Field(i)
// Straight up struct field of type field.Field
if v.CanAddr() == true && v.Addr().Type().Implements(fieldType) == true {
fields = append(fields, field.Name(itf.Field(i).Name))
} else {
t := itf.Field(i)
// Embedded Struct with potential field.Field fields
if t.Anonymous == true && v.CanAddr() == true && v.Kind() == reflect.Struct {
fields = append(fields, modelFields(v.Addr().Interface())...)
} else if t.Anonymous == true && v.CanAddr() == true && v.Kind() == reflect.Interface { // Embedded Model interface
fields = append(fields, modelFields(v.Elem().Interface())...)
}
}
}
return fields
}
// ModelGetField Get a field on a model by name
func ModelGetField(model Model, fieldName field.Name) (field.Field, error) {
modelType := reflect.TypeOf(model)
if modelType.Kind() != reflect.Ptr {
panic("Expected Model to be a Ptr")
}
if modelType.Elem().Kind() != reflect.Struct {
panic("Expected Model to be a Ptr to Struct")
}
return modelGetField(model, fieldName)
}
func modelGetField(model interface{}, fieldName field.Name) (field.Field, error) {
modelType := reflect.TypeOf(model)
if modelType.Kind() == reflect.Ptr {
modelType = modelType.Elem()
}
if _, ok := modelType.FieldByName(string(fieldName)); ok == true {
modelValue := reflect.ValueOf(model).Elem().FieldByName(string(fieldName)).Addr().Interface()
return modelValue.(field.Field), nil
} else {
modelValue := reflect.ValueOf(model)
if modelValue.Kind() == reflect.Ptr {
modelValue = modelValue.Elem()
}
for i := 0; i < modelType.NumField(); i++ {
t := modelType.Field(i)
v := modelValue.Field(i)
if t.Anonymous == true && v.CanAddr() == true && v.Kind() == reflect.Interface {
if m, ok := v.Elem().Interface().(Model); ok == true {
if f, err := modelGetField(m, fieldName); err == nil {
return f, nil
}
}
}
}
}
return nil, errors.New("Name not found")
}
// ModelGetSetFields is named poorly but returns all the fields on a model that have been set.
// For a field to be set, it must of been successfully called with Scan at least once.
func ModelGetSetFields(model Model) (field.Names, error) {
fields := ModelFields(model)
var setFields field.Names
for _, field := range fields {
modelField, err := ModelGetField(model, field)
if err != nil {
return nil, err
}
if modelField.IsSet() {
setFields = append(setFields, field)
}
}
return setFields, nil
}
// ModelTableName get the complete table name including the database
func ModelTableName(s Session, m Model) string {
return fmt.Sprintf("%s.%s", s.Connection().Database(), m.TableName())
}
//
// TODO: Would be nice to have the Session reliant code in a sub package...maybe.
// This is kind of an ActiveRecord/RemoteProxy/RecordGateway pattern
//
// NewSelect builds a select from the Model and Fields
// Selects all fields if no fields provided
func NewSelect(s Session, m Model, fields field.Names) *dbr.SelectBuilder {
return s.Select(defaultFieldsEscaped(m, fields)...).From(ModelTableName(s, m))
}
// NewUpdate builds an update from the Model and Fields
func NewUpdate(s Session, m Model, fields field.Names) *dbr.UpdateBuilder {
if fields == nil {
fields = ModelFields(m)
}
fields = fields.Remove(m.PrimaryKey().Fields())
setMap := defaultUpdate(m, fields)
return s.Update(ModelTableName(s, m)).SetMap(setMap)
}
// NewInsert create an insert from the Model and Fields
func NewInsert(s Session, m Model, fields field.Names) *dbr.InsertBuilder {
if fields == nil {
fields = ModelFields(m)
}
pk := m.PrimaryKey()
fields = fields.Remove(pk.Fields())
// TODO do not eat this error
setFields, _ := pk.Generator(m)
fields = fields.Add(setFields)
return s.InsertInto(ModelTableName(s, m)).Columns(fields.SnakeCase()...)
}
// NewDelete creates a delete from the Model
func NewDelete(s Session, m Model) *dbr.DeleteBuilder {
return s.DeleteFrom(ModelTableName(s, m))
}
// ModelSave Save a model, calls appropriate Insert or Update based on Model.IsNew()
func ModelSave(dbrSess Session, model Model, fields field.Names) (sql.Result, error) {
if model.IsNew() == true {
return nil, errors.New("ModelSave for when IsNew Not Implement")
}
// TODO: handle composite primary keys
if len(model.PrimaryKey().Fields()) > 1 {
panic("ModelSave Composite Primary Keys not yet implemented")
}
primaryFieldName := model.PrimaryKey().Fields()[0]
idField, err := ModelGetField(model, primaryFieldName)
if err != nil {
return nil, err
}
id, err := idField.Value()
if err != nil {
return nil, err
}
return NewUpdate(dbrSess, model, fields).Where(fmt.Sprintf("`%s`=?", primaryFieldName.SnakeCase()), id).Exec()
}
// ModelLoadMap load a map into a model
func ModelLoadMap(model Model, data map[string]interface{}) error {
for k, v := range data {
modelField, err := ModelGetField(model, field.NewNameFromSnakeCase(k))
if err != nil {
continue
}
err = modelField.Scan(v)
if err != nil {
return err
}
}
return nil
}
// ModelDirtyFields return Names of the fields that are dirty
func ModelDirtyFields(model Model) (field.Names, error) {
dirtyFields := make(field.Names, 0)
fields := ModelFields(model)
for _, fieldName := range fields {
mf, err := ModelGetField(model, fieldName)
if err != nil {
return nil, err
}
if mf.IsDirty() == true {
dirtyFields = append(dirtyFields, fieldName)
}
}
return dirtyFields, nil
}
// ModelValidate fields provided on model, if no fields validate all fields
func ModelValidate(sess Session, model Model, fields field.Names) error {
validators := sess.Connection().ValidatorCache()
if fields == nil {
fields = ModelFields(model)
}
if len(validators.Get(model)) == 0 {
if vm, ok := model.(ModelValidators); ok == true {
validators.Set(model, vm.Validators())
} else {
return nil
}
}
err := validators.Validate(sess, model, fields)
if err == nil { // a ptr to a struct cast into an interface is no longer really nil
return nil
}
return err
}