Add message from service administrator

models/notices.js

@@ -0,0 +1,36 @@
+Notices = new Mongo.Collection('notices');
+
+Notices.attachSchema(new SimpleSchema({
+  enabled: {
+    type: Boolean,
+    defaultValue: false,
+  },
+  title: {
+    type: String,
+    optional: true,
+  },
+  body: {
+    type: String,
+    optional: true,
+  },
+  sort: {
+    type: Number,
+    decimal: true,
+  },
+}));
+
+Notices.allow({
+  update(userId) {
+    const user = Users.findOne(userId);
+    return user && user.isAdmin;
+  },
+});
+
+if (Meteor.isServer) {
+  Meteor.startup(() => {
+    const notices = Notices.findOne({});
+    if(!notices){
+      Notices.insert({enabled: false, sort: 0});
+    }
+  });
+}