Pongo2 filter using reflect

test.go

// TrueCondition implement IConditionCheckable interface
func (test *TestStruct) TrueCondition() bool {
  if test.IsTrue {
		return true
	}

	return false
}

util.go

// IConditionCheckable interface for every type that have function to return true condition
type IConditionCheckable interface {
	TrueCondition() bool
}

// FilterTrueCondition pongo2 filter to check if there is a value in the map return true for a condition
func FilterTrueCondition(in *pongo2.Value, param *pongo2.Value) (*pongo2.Value, *pongo2.Error) {
	inValue := reflect.ValueOf(in.Interface())
	if inValue.Kind() != reflect.Map {
		return nil, &pongo2.Error{Sender: "filter:trueCondition"}
	}

	for _, k := range inValue.MapKeys() {
		v := inValue.MapIndex(k)
		mapVal := v.Interface()
		if rv, ok := mapVal.(IConditionCheckable); ok {
			if rv.TrueCondition() {
				return pongo2.AsValue(true), nil
			}
		}
	}

	return pongo2.AsValue(false), nil
}