server/posts: add relation-count token

API.md

@@ -593,6 +593,7 @@ data.
     | `comment-count`  | having given number of comments                            |
     | `fav-count`      | favorited by given number of users                         |
     | `note-count`     | having given number of annotations                         |
+    | `relation-count` | having given number of relations                           |
     | `feature-count`  | having been featured given number of times                 |
     | `type`           | given type of posts. `<value>` can be either `image`, `animation` (or `animated` or `anim`), `flash` (or `swf`) or `video` (or `webm`). |
     | `file-size`      | having given file size (in bytes)                          |
@@ -630,6 +631,7 @@ data.
     | `comment-count`  | most commented first                             |
     | `fav-count`      | loved by most                                    |
     | `note-count`     | with most annotations                            |
+    | `relation-count` | with most relations                              |
     | `feature-count`  | most often featured                              |
     | `file-size`      | largest files first                              |
     | `image-width`    | widest images first                              |

client/html/help_search_posts.tpl

@@ -54,6 +54,10 @@
             <td><code>note-count</code></td>
             <td>having given number of annotations</td>
         </tr>
+        <tr>
+            <td><code>relation-count</code></td>
+            <td>having given number of relations</td>
+        </tr>
         <tr>
             <td><code>feature-count</code></td>
             <td>having been featured given number of times</td>
@@ -189,6 +193,10 @@
             <td><code>note-count</code></td>
             <td>with most annotations</td>
         </tr>
+        <tr>
+            <td><code>relation-count</code></td>
+            <td>with most relations</td>
+        </tr>
         <tr>
             <td><code>feature-count</code></td>
             <td>most often featured</td>

server/szurubooru/db/post.py

@@ -187,3 +187,8 @@ class Post(Base):
         select([func.count(PostNote.post_id)]) \
         .where(PostNote.post_id == post_id) \
         .correlate_except(PostNote))
+
+    relation_count = column_property(
+        select([func.count(PostRelation.child_id)]) \
+        .where(PostRelation.parent_id == post_id) \
+        .correlate_except(PostRelation))

server/szurubooru/search/configs/post_search_config.py

@@ -153,6 +153,7 @@ class PostSearchConfig(BaseSearchConfig):
             'comment-count': search_util.create_num_filter(db.Post.comment_count),
             'fav-count': search_util.create_num_filter(db.Post.favorite_count),
             'note-count': search_util.create_num_filter(db.Post.note_count),
+            'relation-count': search_util.create_num_filter(db.Post.relation_count),
             'feature-count': search_util.create_num_filter(db.Post.feature_count),
             'type': search_util.create_str_filter(db.Post.type, _type_transformer),
             'file-size': search_util.create_num_filter(db.Post.file_size),
@@ -186,6 +187,7 @@ class PostSearchConfig(BaseSearchConfig):
             'comment-count': (db.Post.comment_count, self.SORT_DESC),
             'fav-count': (db.Post.favorite_count, self.SORT_DESC),
             'note-count': (db.Post.note_count, self.SORT_DESC),
+            'relation-count': (db.Post.relation_count, self.SORT_DESC),
             'feature-count': (db.Post.feature_count, self.SORT_DESC),
             'file-size': (db.Post.file_size, self.SORT_DESC),
             ('image-width', 'width'): (db.Post.canvas_width, self.SORT_DESC),