ensure that the internal model field in the Document struct is tagged with bson:"-"

document.go

@@ -10,9 +10,9 @@ type Document struct {
 	Created time.Time `bson:"createdAt" json:"createdAt"`
 	// Modified time. updated/added automatically.
 	Modified time.Time `bson:"updatedAt" json:"updatedAt"`
-	model    *Model
-	exists   bool `bson:"-"`
-	self     any  `bson:"-"`
+	model    *Model    `bson:"-"`
+	exists   bool      `bson:"-"`
+	self     any       `bson:"-"`
 }
 type IDocument interface {
 	Append(field string, a ...interface{}) error