Fixed: Book filters on author properties

Fixes #1755

frontend/src/Utilities/Array/sortCollection.js

@@ -0,0 +1,42 @@
+import _ from 'lodash';
+import { sortDirections } from 'Helpers/Props';
+
+function getSortClause(sortKey, sortDirection, sortPredicates) {
+  if (sortPredicates && sortPredicates.hasOwnProperty(sortKey)) {
+    return function(item) {
+      return sortPredicates[sortKey](item, sortDirection);
+    };
+  }
+
+  return function(item) {
+    return item[sortKey];
+  };
+}
+
+function sortCollection(items, state) {
+  const {
+    sortKey,
+    sortDirection,
+    sortPredicates,
+    secondarySortKey,
+    secondarySortDirection
+  } = state;
+
+  const clauses = [];
+  const orders = [];
+
+  clauses.push(getSortClause(sortKey, sortDirection, sortPredicates));
+  orders.push(sortDirection === sortDirections.ASCENDING ? 'asc' : 'desc');
+
+  if (secondarySortKey &&
+        secondarySortDirection &&
+        (sortKey !== secondarySortKey ||
+         sortDirection !== secondarySortDirection)) {
+    clauses.push(getSortClause(secondarySortKey, secondarySortDirection, sortPredicates));
+    orders.push(secondarySortDirection === sortDirections.ASCENDING ? 'asc' : 'desc');
+  }
+
+  return _.orderBy(items, clauses, orders);
+}
+
+export default sortCollection;