Sandro Lutz
--- a/src/models/groups.js 0 → 100644
+++ b/src/models/groups.js 0 → 100644
+  }
+  return this.memberships;
+}
+
+export function enroll(groupId) {
+  return m.request({
+    method: 'POST',
+    url: `${apiUrl}/groupmemberships`,
+    headers: getToken() ? {
+      Authorization: `Token ${getToken()}`,
+    } : {},
+    data: { group: groupId, user: getUserId() },
+  }).then((result) => {
+    const membership = result;
+    const group = this.groups.find(item => item._id === membership.group);
+    membership.group = group === undefined ? membership.group : group;
--- a/src/views/profile.js 0 → 100644
+++ b/src/views/profile.js 0 → 100644
+          },
+        };
+
+        if (this.busy[membership.group._id]) {
+          buttonArgs.disabled = 'disabled';
+        }
+
+        return m('div', [
+          m('span', membership.group.name),
+          membership.expiry === undefined ? undefined : m('span', `(expires on ${membership.expiry})`),
+          m('button', buttonArgs, 'withdraw'),
+        ]);
+      })),
+      m('div', groups.getList().map((group) => {
+        if (groups.getMemberships().some(element => element.group._id === group._id)) {
+          return m.trust('');