server/posts: add ownFavorite field to posts

server/szurubooru/func/posts.py

@@ -93,6 +93,9 @@ def serialize_post(post, authenticated_user, options=None):
             'user': lambda: users.serialize_micro_user(post.user),
             'score': lambda: post.score,
             'ownScore': lambda: scores.get_score(post, authenticated_user),
+            'ownFavorite': lambda: len(
+                [user for user in post.favorited_by \
+                    if user.user_id == authenticated_user.user_id]) > 0,
             'tagCount': lambda: post.tag_count,
             'favoriteCount': lambda: post.favorite_count,
             'commentCount': lambda: post.comment_count,

server/szurubooru/tests/func/test_posts.py

@@ -147,6 +147,7 @@ def test_serialize_post(
         'notes': [],
         'user': 'post author',
         'score': 1,
+        'ownFavorite': False,
         'ownScore': -1,
         'tagCount': 2,
         'favoriteCount': 1,