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model.go
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model.go
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package pop
import (
"fmt"
"reflect"
"sync"
"time"
"github.com/markbates/inflect"
"github.com/markbates/validate"
"github.com/pkg/errors"
"github.com/satori/go.uuid"
)
var tableMap = map[string]string{}
var tableMapMu = sync.RWMutex{}
// MapTableName allows for the customize table mapping
// between a name and the database. For example the value
// `User{}` will automatically map to "users".
// MapTableName would allow this to change.
//
// m := &pop.Model{Value: User{}}
// m.TableName() // "users"
//
// pop.MapTableName("user", "people")
// m = &pop.Model{Value: User{}}
// m.TableName() // "people"
func MapTableName(name string, tableName string) {
defer tableMapMu.Unlock()
tableMapMu.Lock()
tableMap[name] = tableName
}
type Value interface{}
// Model is used throughout Pop to wrap the end user interface
// that is passed in to many functions.
type Model struct {
Value
tableName string
}
func (m *Model) runValidations(c *Connection, names ...string) (*validate.Errors, error) {
for _, n := range names {
rv := reflect.ValueOf(m.Value)
mv := rv.MethodByName(n)
if mv.IsValid() {
if mv.Type().NumOut() < 2 {
return nil, errors.Errorf("%s does not have the correct method signature!", n)
}
out := mv.Call([]reflect.Value{reflect.ValueOf(c)})
verrs := validate.NewErrors()
var err error
if !out[0].IsNil() {
verrs = out[0].Interface().(*validate.Errors)
}
if !out[1].IsNil() {
err = out[1].Interface().(error)
}
if verrs.HasAny() || err != nil {
return verrs, err
}
}
}
return validate.NewErrors(), nil
}
func (m *Model) validate(c *Connection) (*validate.Errors, error) {
return m.runValidations(c, "Validate")
}
func (m *Model) validateCreate(c *Connection) (*validate.Errors, error) {
return m.runValidations(c, "Validate", "ValidateCreate")
}
func (m *Model) validateSave(c *Connection) (*validate.Errors, error) {
return m.runValidations(c, "Validate", "ValidateSave")
}
func (m *Model) validateUpdate(c *Connection) (*validate.Errors, error) {
return m.runValidations(c, "Validate", "ValidateUpdate")
}
// ID returns the ID of the Model. All models must have an `ID` field this is
// of type `int` or of type `uuid.UUID`.
func (m *Model) ID() interface{} {
fbn, err := m.fieldByName("ID")
if err != nil {
return 0
}
if m.PrimaryKeyType() == "UUID" {
return fbn.Interface().(uuid.UUID).String()
}
return fbn.Interface()
}
func (m *Model) PrimaryKeyType() string {
fbn, err := m.fieldByName("ID")
if err != nil {
return "int"
}
return fbn.Type().Name()
}
// TableName returns the corresponding name of the underlying database table
// for a given `Model`. See also `MapTableName` to change the default name of
// the table.
func (m *Model) TableName() string {
if m.tableName != "" {
return m.tableName
}
t := reflect.TypeOf(m.Value)
name := m.typeName(t)
defer tableMapMu.Unlock()
tableMapMu.Lock()
if tableMap[name] == "" {
m.tableName = inflect.Tableize(name)
tableMap[name] = m.tableName
}
return tableMap[name]
}
func (m *Model) typeName(t reflect.Type) string {
kind := t.Kind().String()
switch kind {
case "ptr":
st := reflect.ValueOf(m.Value).Elem()
return m.typeName(st.Type())
case "string":
return m.Value.(string)
case "slice":
if t.Elem().Kind().String() == "ptr" {
return m.typeName(t.Elem().Elem())
}
return t.Elem().Name()
default:
return t.Name()
}
}
func (m *Model) fieldByName(s string) (reflect.Value, error) {
el := reflect.ValueOf(m.Value).Elem()
fbn := el.FieldByName(s)
if !fbn.IsValid() {
return fbn, errors.Errorf("Model does not have a field named %s", s)
}
return fbn, nil
}
func (m *Model) associationName() string {
tn := inflect.Singularize(m.TableName())
return fmt.Sprintf("%s_id", tn)
}
func (m *Model) setID(i interface{}) {
fbn, err := m.fieldByName("ID")
if err == nil {
fbn.Set(reflect.ValueOf(i))
}
}
func (m *Model) touchCreatedAt() {
fbn, err := m.fieldByName("CreatedAt")
if err == nil {
fbn.Set(reflect.ValueOf(time.Now()))
}
}
func (m *Model) touchUpdatedAt() {
fbn, err := m.fieldByName("UpdatedAt")
if err == nil {
fbn.Set(reflect.ValueOf(time.Now()))
}
}
func (m *Model) whereID() string {
id := m.ID()
if _, ok := id.(int); ok {
return fmt.Sprintf("%s.id = %d", m.TableName(), id)
}
return fmt.Sprintf("%s.id ='%s'", m.TableName(), id)
}