server/comments: allow anonymous users to leave comments

client/html/comment.tpl

@@ -26,7 +26,7 @@
                         %><a href='<%- ctx.formatClientLink('user', ctx.user.name) %>'><%
                     %><% } %><%
 
-                    %><%- ctx.user ? ctx.user.name : 'Deleted user' %><%
+                    %><%- ctx.user ? ctx.user.name : 'Anonymous' %><%
 
                     %><% if (ctx.user && ctx.user.name && ctx.canViewUsers) { %><%
                         %></a><%

server/szurubooru/api/comment_api.py

@@ -48,7 +48,7 @@ def create_comment(
     text = ctx.get_param_as_string("text")
     post_id = ctx.get_param_as_int("postId")
     post = posts.get_post_by_id(post_id)
-    comment = comments.create_comment(ctx.user, post, text)
+    comment = comments.create_comment(ctx.user if ctx.user.name else None, post, text)
     ctx.session.add(comment)
     ctx.session.commit()
     return _serialize(ctx, comment)

server/szurubooru/model/comment.py

@@ -46,7 +46,7 @@ class Comment(Base):
     user_id = sa.Column(
         "user_id",
         sa.Integer,
-        sa.ForeignKey("user.id"),
+        sa.ForeignKey("user.id", ondelete="SET NULL"),
         nullable=True,
         index=True,
     )