Update to 8.3.0 | MVC Models and Bindings and fix of #723 , read HISTORY.md

Former-commit-id: d8f66d8d370c583a288333df2a14c6ee2dc56466

mvc/activator/model_control.go

@@ -0,0 +1,54 @@
+package activator
+
+import (
+	"reflect"
+
+	"github.com/kataras/iris/context"
+)
+
+type modelControl struct {
+	fields []field
+}
+
+func (mc *modelControl) Load(t *TController) error {
+	fields := lookupFields(t, func(f reflect.StructField) bool {
+		if tag, ok := f.Tag.Lookup("iris"); ok {
+			if tag == "model" {
+				return true
+			}
+		}
+		return false
+	})
+
+	if len(fields) == 0 {
+		// first is the `Controller` so we need to
+		// check the second and after that.
+		return ErrControlSkip
+	}
+
+	mc.fields = fields
+	return nil
+}
+
+func (mc *modelControl) Handle(ctx context.Context, c reflect.Value, methodFunc func()) {
+	elem := c.Elem() // controller should always be a pointer at this state
+
+	for _, f := range mc.fields {
+		elemField := elem.Field(f.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 {
+			continue
+		}
+		fieldValue := elemField.Interface()
+		// fmt.Printf("setting %s to %#v", f.Name, fieldValue)
+		ctx.ViewData(f.Name, fieldValue)
+	}
+}
+
+// ModelControl returns a TControl which is responsible
+// to load and handle the `Model(s)` inside a controller struct
+// via the  `iris:"model"` tag field.
+func ModelControl() TControl {
+	return &modelControl{}
+}