diff --git a/db/seeds/08_dummy_announcement_authors.js b/db/seeds/08_dummy_announcement_authors.js
new file mode 100644
index 0000000000000000000000000000000000000000..154dd90f00ea023204cca5997e93109a87e3d81d
--- /dev/null
+++ b/db/seeds/08_dummy_announcement_authors.js
@@ -0,0 +1,25 @@
+
+exports.seed = async function (knex, Promise) {
+    // Deletes ALL existing entries
+    await knex('announcements_authors').del();
+    // Inserts seed entries
+    const announcements_authors = [{
+        mid: 0,
+        gid: 'br'
+    },{
+        mid: 1,
+        gid: 'jtx'
+    },{
+        mid: 2,
+        gid: 'x-chine'
+    },{
+        mid: 3,
+        gid: 'br'
+    },{
+        mid: 4,
+        gid: 'federez'
+    }
+    ];
+    return knex('announcements_authors').insert(announcements_authors)
+        .then(console.log("finished running 04_dummy_announcements"));
+};
diff --git a/src/graphql/models/messageModel.ts b/src/graphql/models/messageModel.ts
index a2b20b8400351ff2f2159fb375375c4507a53ee6..c3a2f92fb23150448ac1b821f4ce133d95f3fe2f 100644
--- a/src/graphql/models/messageModel.ts
+++ b/src/graphql/models/messageModel.ts
@@ -112,7 +112,6 @@ export class MessageModel {
      */
     async getAllAnnouncements(groups: GroupSet): Promise<Announcement[]> {
         throw "Not implemented";
-        
         /*let result = await knex.select().from('announcements').whereIn('id', selection);
         result = result.concat(
             await knex.select().from('events').whereIn('id', selection)
@@ -133,8 +132,9 @@ export class MessageModel {
      * @rights member of groups
      */
     async getAllAnnouncementsSent(groups: GroupSet): Promise<Announcement[]> {
-        throw "Not implemented";
-        
+        let announces = await knex.distinct('mid').select().from('announcements_authors').whereIn('gid', [...groups]);
+        return announces.map(elt => new Announcement(elt.mid));
+
         /*let result = await knex.select().from('announcements').whereIn('gid');
         result = result.concat(
             await knex.select().from('events').whereIn('id')