add relationships to Sam::Calendar

Sam/Calendar.pm

@@ -20,6 +20,22 @@ __PACKAGE__->meta->setup
     ],
 
     primary_key_columns => [ 'id' ],
+
+    relationships =>
+    [
+        chans =>
+        {
+            type        => 'one to many',
+            class       => 'Sam::Chan',
+            column_map  => { id => 'calendar_id' },
+        },
+        events =>
+        {
+            type        => 'one to many',
+            class       => 'Sam::Event',
+            column_map  => { id => 'calendar_id' },
+        },
+    ],
 );
 
 1;