fix(Browser): Inifite scroll not working (#1432)

After #1334, the infinite scroll is no longer loading the next set of objects. This commit undoes #1334, and tries another approach in order to fix the original problem.

Author: douglasmuraoka

src/dashboard/Data/Browser/Browser.react.js

@@ -405,7 +405,7 @@ class Browser extends DashboardView {
     let className = this.props.params.className;
     let source = this.state.relation || className;
     let query = queryFromFilters(source, this.state.filters);
-    if (this.state.ordering !== 'createdAt') {
+    if (this.state.ordering !== '-createdAt') {
       // Construct complex pagination query
       let equalityQuery = queryFromFilters(source, this.state.filters);
       let field = this.state.ordering;
@@ -421,8 +421,12 @@ class Browser extends DashboardView {
       } else {
         query.greaterThan(field, comp);
       }
-      equalityQuery.equalTo(field, comp);
-      equalityQuery.lessThan('createdAt', this.state.data[this.state.data.length - 1].get('createdAt'));
+      if (field === 'createdAt') {
+        equalityQuery.greaterThan('createdAt', this.state.data[this.state.data.length - 1].get('createdAt'));
+      } else {
+        equalityQuery.lessThan('createdAt', this.state.data[this.state.data.length - 1].get('createdAt'));
+        equalityQuery.equalTo(field, comp);
+      }
       query = Parse.Query.or(query, equalityQuery);
       if (ascending) {
         query.ascending(this.state.ordering);
@@ -431,8 +435,8 @@ class Browser extends DashboardView {
       }
     } else {
       query.lessThan('createdAt', this.state.data[this.state.data.length - 1].get('createdAt'));
+      query.addDescending('createdAt');
     }
-    query.addDescending('createdAt');
     query.limit(MAX_ROWS_FETCHED);
 
     query.find({ useMasterKey: true }).then((nextPage) => {