Partially implements Announcements.authors

Missing the verification of authorisations

src/graphql/object_resolvers/messages.ts

@@ -254,10 +254,15 @@ export class Announcement extends Message {
      * @async
      */
     async authors(args, context: Context, info): Promise<Group[]> {
+        //TODO: verifier les authorisations
         throw "Not implemented";
-    
-        /*return knex.select({ uid: 'group' }).from('group_message_relationships')
-            .where('message', messageID).whereIn('status', ['host', 'publish']);*/
+        
+        await this.fetchData();
+        var ret:Group[];
+        for(let t of this.m_authors) {
+            ret.push(new SimpleGroup(t));
+        }
+        return ret;
     }
 
     /**