Remove usage of entity_id_N

Ok great, I always wondered why we needed the parent options.

general question
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+  // Field API date fields.
+  foreach (field_info_fields() as $id => $field) {
+    if (in_array($field['type'], array('date', 'datestamp', 'datetime'))) {
+      $data['field_data_' . $id][$id]['field']['handler'] = 'fullcalendar_handler_field_field';

This code will find ALL the date fields in our system even if we don't need them?
Will this not affect performance?

EDIT:
And what will happen if you have a date field not added to the view. That field would not be a part of $data I guess. So $data['field_data_' . $id][$id]['field']['handler'] doesn't exist and it will throw errors?

After some serious brain dead testing I'm positive about the fact that this patch is working :).