Update to 8.4.0 | New macro type, new high-optimized MVC features. Read HISTORY.md

Former-commit-id: b72a23ba063be60a9750c8b1b0df024b0c8ed549

mvc/activator/model/model.go

@@ -0,0 +1,73 @@
+package model
+
+import (
+	"reflect"
+
+	"github.com/kataras/iris/mvc/activator/field"
+
+	"github.com/kataras/iris/context"
+)
+
+// Controller is responsible
+// to load and handle the `Model(s)` inside a controller struct
+// via the  `iris:"model"` tag field.
+// It stores the optional models from
+// the struct's fields values that
+// are being setted by the method function
+// and set them as ViewData.
+type Controller struct {
+	fields []field.Field
+}
+
+// Load tries to lookup and set for any valid model field.
+// Returns nil if no models are being used.
+func Load(typ reflect.Type) *Controller {
+	matcher := func(f reflect.StructField) bool {
+		if tag, ok := f.Tag.Lookup("iris"); ok {
+			if tag == "model" {
+				return true
+			}
+		}
+		return false
+	}
+
+	fields := field.LookupFields(typ.Elem(), matcher, nil)
+
+	if len(fields) == 0 {
+		return nil
+	}
+
+	mc := &Controller{
+		fields: fields,
+	}
+	return mc
+}
+
+// Handle transfer the models to the view.
+func (mc *Controller) Handle(ctx context.Context, c reflect.Value) {
+	elem := c.Elem() // controller should always be a pointer at this state
+
+	for _, f := range mc.fields {
+
+		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() != typ {
+			continue
+		}
+
+		fieldValue := elemField.Interface()
+		ctx.ViewData(name, fieldValue)
+		// /*maybe some time in the future*/ if resetable {
+		// 	// clean up
+		// 	elemField.Set(reflect.Zero(typ))
+		// }
+
+	}
+}