More edit changes

models/comment.js

@@ -2,6 +2,8 @@ const mongoose = require('../services/mongoose');
 const Schema = mongoose.Schema;
 const uuid = require('uuid');
 
+const EDIT_WINDOW_MS = 30 * 1000; // 30 seconds
+
 const STATUSES = [
   'ACCEPTED',
   'REJECTED',
@@ -107,7 +109,16 @@ const CommentSchema = new Schema({
   }
 });
 
+CommentSchema.virtual('edited').get(function() {
+  return this.body_history.length > 1;
+});
+
+CommentSchema.virtual('editableUntil').get(function() {
+  return new Date(Number(this.created_at) + EDIT_WINDOW_MS);
+});
+
 // Comment model.
 const Comment = mongoose.model('Comment', CommentSchema);
 
 module.exports = Comment;
+module.exports.EDIT_WINDOW_MS = EDIT_WINDOW_MS;