Add tests and implement POSTing comments to a specific comment on the API

[Rikuoja]

Also, serialize all comments related to a comment inside the specific comment JSON in the API.

[sanesane]

Commenting child comments is not supported/allowed. "Single thread commenting"

[Rikuoja]

Agreed.

[Rikuoja]

This is probably doable by first adding the existing Commentable mixin as a superclass for a BaseComment, and then creating CommentComment subclass for BaseComment? Then, a comment could be POSTed to a comment just as well as to a section.

However, then we would require recursively counting all the subcomments of a comment when counting the comments belonging to a section; as the comments would not be directly linked to the section itself, but we want to keep the section total comment number up to date.

[Rikuoja]

Also, we would have to limit commentability so that CommentComment may not have CommentComment as a parent, but only a SectionComment?

[Rikuoja]

If you feel that the current Commentable mixin is not useful here, feel free to suggest a refactor, as the mixin is currently used only for Section but no other classes.