Update to 8.3.3 | Even better MVC. Read HISTORY.md

Former-commit-id: 88998c317117abff1a214cf396b205d8d8ea888c

mvc/activator/activator.go

@@ -151,8 +151,8 @@ func ActivateController(base BaseController, bindValues []interface{},
 	binder := newBinder(typ.Elem(), bindValues)
 	if binder != nil {
 		for _, bf := range binder.fields {
-			golog.Debugf("MVC %s: binder loaded for '%s' with field index of: %d",
-				ctrlName, bf.Name, bf.Index)
+			golog.Debugf("MVC %s: binder loaded for '%s' with value:\n%#v",
+				ctrlName, bf.getFullName(), bf.getValue())
 		}
 	}
 

mvc/activator/binder.go

@@ -66,79 +66,19 @@ func (b *binder) lookup(elem reflect.Type) (fields []field) {
 			continue
 		}
 
-		for i, n := 0, elem.NumField(); i < n; i++ {
-			elemField := elem.Field(i)
-			if elemField.Type == value.Type() {
-				// we area inside the correct type
-				// println("[0] prepare bind filed for " + elemField.Name)
-				fields = append(fields, field{
-					Index: i,
-					Name:  elemField.Name,
-					Type:  elemField.Type,
-					Value: value,
-				})
-				continue
-			}
-
-			f := lookupStruct(elemField.Type, value)
-			if f != nil {
-				fields = append(fields, field{
-					Index:    i,
-					Name:     elemField.Name,
-					Type:     elemField.Type,
-					embedded: f,
-				})
-			}
-
+		matcher := func(elemField reflect.StructField) bool {
+			return elemField.Type == value.Type()
 		}
+
+		handler := func(f *field) {
+			f.Value = value
+		}
+
+		fields = append(fields, lookupFields(elem, matcher, handler)...)
 	}
 	return
 }
 
-func lookupStruct(elem reflect.Type, value reflect.Value) *field {
-	// ignore if that field is not a struct
-	if elem.Kind() != reflect.Struct {
-		// and it's not a controller because we don't want to accidentally
-		// set fields to other user fields. Or no?
-		//  ||
-		// 	(elem.Name() != "" && !strings.HasSuffix(elem.Name(), "Controller")) {
-		return nil
-	}
-
-	// search by fields.
-	for i, n := 0, elem.NumField(); i < n; i++ {
-		elemField := elem.Field(i)
-		if elemField.Type == value.Type() {
-			// println("Types are equal of: " + elemField.Type.Name() + " " + elemField.Name + " and " + value.Type().Name())
-			// we area inside the correct type.
-			return &field{
-				Index: i,
-				Name:  elemField.Name,
-				Type:  elemField.Type,
-				Value: value,
-			}
-		}
-
-		// if field is struct and the value is struct
-		// then try inside its fields for a compatible
-		// field type.
-		if elemField.Type.Kind() == reflect.Struct && value.Type().Kind() == reflect.Struct {
-			elemFieldEmb := elem.Field(i)
-			f := lookupStruct(elemFieldEmb.Type, value)
-			if f != nil {
-				fp := &field{
-					Index:    i,
-					Name:     elemFieldEmb.Name,
-					Type:     elemFieldEmb.Type,
-					embedded: f,
-				}
-				return fp
-			}
-		}
-	}
-	return nil
-}
-
 func (b *binder) handle(c reflect.Value) {
 	// we could make check for middlewares here but
 	// these could easly be used outside of the controller

mvc/activator/field.go

@@ -0,0 +1,217 @@
+package activator
+
+import (
+	"reflect"
+)
+
+type field struct {
+	Name string // the field's original name
+	// but if a tag with `name: "other"`
+	// exist then this fill is filled, otherwise it's the same as the Name.
+	TagName string
+	Index   int
+	Type    reflect.Type
+	Value   reflect.Value
+
+	embedded *field
+}
+
+// getIndex returns all the "dimensions"
+// of the controller struct field's position that this field is referring to,
+// recursively.
+// Usage: elem.FieldByIndex(field.getIndex())
+// for example the {0,1} means that the field is on the second field of the first's
+// field of this struct.
+func (ff field) getIndex() []int {
+	deepIndex := []int{ff.Index}
+
+	if emb := ff.embedded; emb != nil {
+		deepIndex = append(deepIndex, emb.getIndex()...)
+	}
+
+	return deepIndex
+}
+
+// getType returns the type of the referring field, recursively.
+func (ff field) getType() reflect.Type {
+	typ := ff.Type
+	if emb := ff.embedded; emb != nil {
+		return emb.getType()
+	}
+
+	return typ
+}
+
+// getFullName returns the full name of that field
+// i.e: UserController.SessionController.Manager,
+// it's useful for debugging only.
+func (ff field) getFullName() string {
+	name := ff.Name
+
+	if emb := ff.embedded; emb != nil {
+		return name + "." + emb.getFullName()
+	}
+
+	return name
+}
+
+// getTagName returns the tag name of the referring field
+// recursively.
+func (ff field) getTagName() string {
+	name := ff.TagName
+
+	if emb := ff.embedded; emb != nil {
+		return emb.getTagName()
+	}
+
+	return name
+}
+
+// checkVal checks if that value
+// is valid to be set-ed to the new controller's instance.
+// Used on binder.
+func checkVal(val reflect.Value) bool {
+	return val.IsValid() && (val.Kind() == reflect.Ptr && !val.IsNil()) && val.CanInterface()
+}
+
+// getValue returns a valid value of the referring field, recursively.
+func (ff field) getValue() interface{} {
+	if ff.embedded != nil {
+		return ff.embedded.getValue()
+	}
+
+	if checkVal(ff.Value) {
+		return ff.Value.Interface()
+	}
+
+	return "undefinied value"
+}
+
+// sendTo should be used when this field or its embedded
+// has a Value on it.
+// It sets the field's value to the "elem" instance, it's the new controller.
+func (ff field) sendTo(elem reflect.Value) {
+	// note:
+	// we don't use the getters here
+	// because we do recursively search by our own here
+	// to be easier to debug if ever needed.
+	if embedded := ff.embedded; embedded != nil {
+		if ff.Index >= 0 {
+			embedded.sendTo(elem.Field(ff.Index))
+		}
+		return
+	}
+	elemField := elem.Field(ff.Index)
+	if elemField.Kind() == reflect.Ptr && !elemField.IsNil() {
+		return
+	}
+
+	elemField.Set(ff.Value)
+}
+
+// lookupTagName checks if the "elemField" struct's field
+// contains a tag `name`, if it contains then it returns its value
+// otherwise returns the field's original Name.
+func lookupTagName(elemField reflect.StructField) string {
+	vname := elemField.Name
+
+	if taggedName, ok := elemField.Tag.Lookup("name"); ok {
+		vname = taggedName
+	}
+	return vname
+}
+
+// lookupFields iterates all "elem"'s fields and its fields
+// if structs, recursively.
+// Compares them to the "matcher", if they passed
+// then it executes the "handler" if any,
+// the handler can change the field as it wants to.
+//
+// It finally returns that collection of the valid fields, can be empty.
+func lookupFields(elem reflect.Type, matcher func(reflect.StructField) bool, handler func(*field)) (fields []field) {
+	for i, n := 0, elem.NumField(); i < n; i++ {
+		elemField := elem.Field(i)
+		if matcher(elemField) {
+			field := field{
+				Index:   i,
+				Name:    elemField.Name,
+				TagName: lookupTagName(elemField),
+				Type:    elemField.Type,
+			}
+
+			if handler != nil {
+				handler(&field)
+			}
+
+			// we area inside the correct type
+			fields = append(fields, field)
+			continue
+		}
+
+		f := lookupStructField(elemField.Type, matcher, handler)
+		if f != nil {
+			fields = append(fields, field{
+				Index:    i,
+				Name:     elemField.Name,
+				Type:     elemField.Type,
+				embedded: f,
+			})
+		}
+
+	}
+	return
+}
+
+// lookupStructField is here to search for embedded field only,
+// is working with the "lookupFields".
+// We could just one one function
+// for both structured (embedded) fields and normal fields
+// but we keep that as it's, a new function like this
+// is easier for debugging, if ever needed.
+func lookupStructField(elem reflect.Type, matcher func(reflect.StructField) bool, handler func(*field)) *field {
+	// fmt.Printf("lookup struct for elem: %s\n", elem.Name())
+
+	// ignore if that field is not a struct
+	if elem.Kind() != reflect.Struct {
+		return nil
+	}
+
+	// search by fields.
+	for i, n := 0, elem.NumField(); i < n; i++ {
+		elemField := elem.Field(i)
+		if matcher(elemField) {
+			// we area inside the correct type.
+			f := &field{
+				Index:   i,
+				Name:    elemField.Name,
+				TagName: lookupTagName(elemField),
+				Type:    elemField.Type,
+			}
+
+			if handler != nil {
+				handler(f)
+			}
+
+			return f
+		}
+
+		// if field is struct and the value is struct
+		// then try inside its fields for a compatible
+		// field type.
+		if elemField.Type.Kind() == reflect.Struct { // 3-level
+			elemFieldEmb := elem.Field(i)
+			f := lookupStructField(elemFieldEmb.Type, matcher, handler)
+			if f != nil {
+				fp := &field{
+					Index:    i,
+					Name:     elemFieldEmb.Name,
+					TagName:  lookupTagName(elemFieldEmb),
+					Type:     elemFieldEmb.Type,
+					embedded: f,
+				}
+				return fp
+			}
+		}
+	}
+	return nil
+}

mvc/activator/model_control.go

@@ -11,14 +11,16 @@ type modelControl struct {
 }
 
 func (mc *modelControl) Load(t *TController) error {
-	fields := lookupFields(t, func(f reflect.StructField) bool {
+	matcher := func(f reflect.StructField) bool {
 		if tag, ok := f.Tag.Lookup("iris"); ok {
 			if tag == "model" {
 				return true
 			}
 		}
 		return false
-	})
+	}
+
+	fields := lookupFields(t.Type.Elem(), matcher, nil)
 
 	if len(fields) == 0 {
 		// first is the `Controller` so we need to
@@ -34,15 +36,22 @@ func (mc *modelControl) Handle(ctx context.Context, c reflect.Value, methodFunc
 	elem := c.Elem() // controller should always be a pointer at this state
 
 	for _, f := range mc.fields {
-		elemField := elem.Field(f.Index)
+
+		index := f.getIndex()
+		typ := f.getType()
+		name := f.getTagName()
+
+		elemField := elem.FieldByIndex(index)
 		// check if current controller's element field
 		// is valid, is not nil and it's type is the same (should be but make that check to be sure).
-		if !elemField.IsValid() || (elemField.Kind() == reflect.Ptr && elemField.IsNil()) || elemField.Type() != f.Type {
+		if !elemField.IsValid() ||
+			(elemField.Kind() == reflect.Ptr && elemField.IsNil()) ||
+			elemField.Type() != typ {
 			continue
 		}
+
 		fieldValue := elemField.Interface()
-		// fmt.Printf("setting %s to %#v", f.Name, fieldValue)
-		ctx.ViewData(f.Name, fieldValue)
+		ctx.ViewData(name, fieldValue)
 	}
 }
 

mvc/activator/persistence_data_control.go

@@ -6,77 +6,31 @@ import (
 	"github.com/kataras/iris/context"
 )
 
-type field struct {
-	Name  string // by-defaultis the field's name but if `name: "other"` then it's overridden.
-	Index int
-	Type  reflect.Type
-	Value reflect.Value
-
-	embedded *field
-}
-
-func (ff field) sendTo(elem reflect.Value) {
-	if embedded := ff.embedded; embedded != nil {
-		if ff.Index >= 0 {
-			embedded.sendTo(elem.Field(ff.Index))
-		}
-		return
-	}
-	elemField := elem.Field(ff.Index)
-	if elemField.Kind() == reflect.Ptr && !elemField.IsNil() {
-		return
-	}
-
-	elemField.Set(ff.Value)
-}
-
-func lookupFields(t *TController, validator func(reflect.StructField) bool) (fields []field) {
-	elem := t.Type.Elem()
-
-	for i, n := 0, elem.NumField(); i < n; i++ {
-		elemField := elem.Field(i)
-		valF := t.Value.Field(i)
-
-		// catch persistence data by tags, i.e:
-		// MyData string `iris:"persistence"`
-		if validator(elemField) {
-			name := elemField.Name
-			if nameTag, ok := elemField.Tag.Lookup("name"); ok {
-				name = nameTag
-			}
-
-			f := field{
-				Name:  name,
-				Index: i,
-				Type:  elemField.Type,
-			}
-
-			if valF.IsValid() || (valF.Kind() == reflect.Ptr && !valF.IsNil()) {
-				val := reflect.ValueOf(valF.Interface())
-				if val.IsValid() || (val.Kind() == reflect.Ptr && !val.IsNil()) {
-					f.Value = val
-				}
-			}
-
-			fields = append(fields, f)
-		}
-	}
-	return
-}
-
 type persistenceDataControl struct {
 	fields []field
 }
 
 func (d *persistenceDataControl) Load(t *TController) error {
-	fields := lookupFields(t, func(f reflect.StructField) bool {
-		if tag, ok := f.Tag.Lookup("iris"); ok {
+	matcher := func(elemField reflect.StructField) bool {
+		if tag, ok := elemField.Tag.Lookup("iris"); ok {
 			if tag == "persistence" {
 				return true
 			}
 		}
 		return false
-	})
+	}
+
+	handler := func(f *field) {
+		valF := t.Value.Field(f.Index)
+		if valF.IsValid() || (valF.Kind() == reflect.Ptr && !valF.IsNil()) {
+			val := reflect.ValueOf(valF.Interface())
+			if val.IsValid() || (val.Kind() == reflect.Ptr && !val.IsNil()) {
+				f.Value = val
+			}
+		}
+	}
+
+	fields := lookupFields(t.Type.Elem(), matcher, handler)
 
 	if len(fields) == 0 {
 		// first is the `Controller` so we need to