Cover image linked to gallery

You are not doing anything wrong. This a bug with the current gallery grid view. (and with your custom view)

I need to think about how to handle this. It seems like I need another view mode for the gallery items that is specifically for gallery covers. One that is not linked to the node by default.

Just as a note, in D6 we did this through a CCK field formatter that linked to the gallery. In my opinion, it is nice to have this also for other images, not just the cover. E.g. we typically have a preview of 3 to 4 images, that all link to the gallery by default. You can also use this in other places then.

Providing 2 field formatters in NG (one linking to the image and one to the gallery) would probably also render the file entity link module dependency obsolete.

Attached is a patch which should make linking to the gallery possible. Apply the patch, then run update.php. After update, you will need to go edit your view, and on the media file instead of view mode Node Gallery File Thumbnail, choose Node Gallery File Cover. That should give you a link to the gallery with the thumbnail of the item.

I'm getting rid of the dependency on File Entity Link module with this patch. There is a new option in its place from NG API that allows linking to the gallery item or the gallery. The update script sets reasonable defaults. Note: this patch currently works only on update. I still need to go back and make this change work with new installs.

Did you make your own view or are you using the default galleries grid view that came with Node Gallery. If you made your own, can you export it and post it here?

You need to use a relationship to get the cover item for the gallery, and you need to use fields in the view so you can get the title of the gallery with the image from the item. Try this version:

$view = new view();
$view->name = 'gallery_test';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'Gallery';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'Gallery';
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['use_more_text'] = 'altro';
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['exposed_form']['options']['submit_button'] = 'Applica';
$handler->display->display_options['exposed_form']['options']['reset_button_label'] = 'Ripristina';
$handler->display->display_options['exposed_form']['options']['exposed_sorts_label'] = 'Ordina per';
$handler->display->display_options['exposed_form']['options']['sort_desc_label'] = 'Disc';
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['pager']['options']['items_per_page'] = '15';
$handler->display->display_options['pager']['options']['expose']['items_per_page_label'] = 'Voci per pagina';
$handler->display->display_options['pager']['options']['expose']['items_per_page_options_all_label'] = '- Tutto -';
$handler->display->display_options['pager']['options']['expose']['offset_label'] = 'Scostamento';
$handler->display->display_options['pager']['options']['tags']['first'] = '« prima';
$handler->display->display_options['pager']['options']['tags']['previous'] = '‹ precedente';
$handler->display->display_options['pager']['options']['tags']['next'] = 'seguente ›';
$handler->display->display_options['pager']['options']['tags']['last'] = 'ultima »';
$handler->display->display_options['style_plugin'] = 'grid';
$handler->display->display_options['row_plugin'] = 'fields';
/* Relationship: Node Gallery: Gallery Cover Item */
$handler->display->display_options['relationships']['cover_item']['id'] = 'cover_item';
$handler->display->display_options['relationships']['cover_item']['table'] = 'node_gallery_galleries';
$handler->display->display_options['relationships']['cover_item']['field'] = 'cover_item';
/* Field: Content: Title */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['label'] = '';
$handler->display->display_options['fields']['title']['element_type'] = 'h2';
$handler->display->display_options['fields']['title']['element_label_colon'] = FALSE;
/* Field: Content: Gallery Media  */
$handler->display->display_options['fields']['node_gallery_media']['id'] = 'node_gallery_media';
$handler->display->display_options['fields']['node_gallery_media']['table'] = 'field_data_node_gallery_media';
$handler->display->display_options['fields']['node_gallery_media']['field'] = 'node_gallery_media';
$handler->display->display_options['fields']['node_gallery_media']['relationship'] = 'cover_item';
$handler->display->display_options['fields']['node_gallery_media']['label'] = '';
$handler->display->display_options['fields']['node_gallery_media']['alter']['path'] = 'node';
$handler->display->display_options['fields']['node_gallery_media']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['node_gallery_media']['click_sort_column'] = 'fid';
$handler->display->display_options['fields']['node_gallery_media']['type'] = 'file_rendered';
$handler->display->display_options['fields']['node_gallery_media']['settings'] = array(
  'file_view_mode' => 'node_gallery_file_cover',
);
/* Sort criterion: Content: Post date */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
/* Filter criterion: Content: Published */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 1;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Content: Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
  'node_gallery_gallery' => 'node_gallery_gallery',
);

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page');
$handler->display->display_options['defaults']['hide_admin_links'] = FALSE;
$handler->display->display_options['path'] = 'gallery/foto';
$handler->display->display_options['menu']['type'] = 'normal';
$handler->display->display_options['menu']['title'] = 'Galleryfoto';
$handler->display->display_options['menu']['weight'] = '0';
$handler->display->display_options['menu']['name'] = 'main-menu';
$handler->display->display_options['menu']['context'] = 0;

I made a few changes to that patch, and then committed them to dev. The changes were mainly related to making it work for a new install so I don't think you need to do anything on the next update. Your custom view should work.

For anyone else planning to apply the patch from #5, use the attached one instead. (@edubacco, you don't need to do this)