fix(SIte Users): 502 errors for member of lots of organisations (LLC-34) (#1513)

Author: PrinceWaune

Diff for: lib/models/plugins/addCRUDFunctions.js

@@ -181,7 +181,7 @@ async function getConnection({
     query.where(cursorFilter);
   } else if (before) {
     const cursorFilter = paginationToFilter({
-      cursor: after,
+      cursor: before,
       sort,
       paginationDirection: direction
     });

Diff for: ui/src/pages/SiteUsersPage/SiteUserOrgItems.js

@@ -1,7 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { Map } from 'immutable';
-import { compose, withProps, setPropTypes } from 'recompose';
+import { compose, setPropTypes, withProps } from 'recompose';
 import { withModels } from 'ui/utils/hocs';
 import SiteUserOrgItem from './SiteUserOrgItem';
 
@@ -11,12 +11,12 @@ const enhance = compose(
   }),
   withProps(({ user }) => {
     const schema = 'organisation';
-    const organisations = user
-      .get('organisations')
-      .map(org => new Map({ $oid: org }));
+    const organisations = user.get('organisations').map(org => new Map({ $oid: org }));
+    // Decision made via (https://github.com/LearningLocker/learninglocker/pull/1513#issuecomment-587064642)
+    // Need to change when we will have OrganisationUser model.
     const filter = new Map({
       _id: new Map({
-        $in: organisations
+        $in: organisations.slice(0, 10)
       })
     });
 
@@ -25,11 +25,37 @@ const enhance = compose(
   withModels
 );
 
-const SiteUserOrgItems = ({ models, user }) => {
-  const orgsItems = models
-    .map(org => <SiteUserOrgItem key={org.get('_id').toString()} org={org} user={user} />)
+const SiteUserOrgItems = ({ models, user, filter }) => {
+  // Decision made via (https://github.com/LearningLocker/learninglocker/pull/1513#issuecomment-587064642)
+  // Need to change when we will have OrganisationUser model.
+  const orgItems = filter
+    .get('_id')
+    .get('$in')
+    .map((org) => {
+      const orgModel = models.find(model =>
+        model.get('_id').toString() === org.get('$oid').toString()
+      );
+
+      if (orgModel === undefined) {
+        return (
+          <li key={org.get('$oid').toString()}>
+            Sorry organisation with id {org.get('$oid')} was deleted!
+          </li>
+        );
+      }
+
+      return <SiteUserOrgItem key={orgModel.get('_id').toString()} org={orgModel} user={user} />;
+    })
     .valueSeq();
-  return <ul>{orgsItems}</ul>;
+
+  const countOfRemainingOrganisations = user.get('organisations').count() - orgItems.count();
+
+  return (
+    <div>
+      <ul>{orgItems}</ul>
+      {countOfRemainingOrganisations > 0 && <p>Plus { countOfRemainingOrganisations } more not displayed</p>}
+    </div>
+  );
 };
 
 export default enhance(SiteUserOrgItems);