toPartialJson method
Converts a CommentModel to a JSON object.
Because of the way we store comments in Firestore, this only returns a partial JSON object. This is because the key of the map is the commentID. This JSON is the value of the commentID in the Firestore document.
Implementation
Map<String, dynamic> toPartialJson() => {
'userID': userID,
'comment': comment,
'commentDate': commentDate,
'isEdited': isEdited,
'lastEdited': lastEdited,
};