Add missing EventRef.get_schema()

gramps/gen/lib/eventref.py

@@ -108,8 +108,32 @@ class EventRef(PrivacyBase, NoteBase, AttributeBase, RefBase,
             "role": self.__role.to_struct()
             }
 
+    @classmethod
+    def get_schema(cls):
+        """
+        Returns the schema for EventRef.
+
+        :returns: Returns a dict containing the fields to types.
+        :rtype: dict
+        """
+        from .attribute import Attribute
+        return {
+            "private": bool,
+            "note_list": [Handle("Note", "NOTE-HANDLE")],
+            "attribute_list": [Attribute],
+            "ref": Handle("Event", "EVENT-HANDLE"),
+            "role": EventRoleType,
+        }
+
     @classmethod
     def get_labels(cls, _):
+        """
+        Given a translation function, returns the labels for
+        each field of this object.
+
+        :returns: Returns a dict containing the fields to labels.
+        :rtype: dict
+        """
         return {
             "private": _("Private"),
             "note_list": _("Notes"),
@@ -252,4 +276,3 @@ class EventRef(PrivacyBase, NoteBase, AttributeBase, RefBase,
         """
         self.__role.set(role)
     role = property(get_role, set_role, None, 'Returns or sets role property')
-