Adding upstream version 0.28.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

core/collection_model_view_options.go

@@ -0,0 +1,18 @@
+package core
+
+import (
+	validation "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+var _ optionsValidator = (*collectionViewOptions)(nil)
+
+// collectionViewOptions defines the options for the "view" type collection.
+type collectionViewOptions struct {
+	ViewQuery string `form:"viewQuery" json:"viewQuery"`
+}
+
+func (o *collectionViewOptions) validate(cv *collectionValidator) error {
+	return validation.ValidateStruct(o,
+		validation.Field(&o.ViewQuery, validation.Required, validation.By(cv.checkViewQuery)),
+	)
+}