fixes #5951 throw an exception in getRowEvolution if a report is requ…

…est that does not have a dimension

CHANGELOG.md

@@ -8,6 +8,7 @@ This is a changelog for Piwik platform developers. All changes for our HTTP API'
 * The [settings](http://developer.piwik.org/guides/piwik-configuration) API will receive the actual entered value and will no longer convert characters like `&` to `&`. If you still want this behavior - for instance to prevent XSS - you can define a filter by setting the `transform` property like this:
   `$setting->transform = function ($value) { return Common::sanitizeInputValue($value); }`
 * Config setting `disable_merged_assets` moved from `Debug` section to `Development`. The updater will automatically change the section for you.
+* `API.getRowEvolution` will throw an exception if a report is requested that does not have a dimension, for instance `VisitsSummary.get`. This is a fix as an invalid format was returned before see [#5951](https://github.com/piwik/piwik/issues/5951)
 
 ### Deprecations
 The following events are considered as deprecated and the new structure should be used in the future. We have not scheduled when those events will be removed but probably in Piwik 3.0 which is not scheduled yet and won't be soon. New features will be added only to the new classes.

plugins/API/RowEvolution.php

@@ -331,6 +331,10 @@ private function getRowEvolutionMetaData($idSite, $period, $date, $apiModule, $a
             $metrics = $metrics + $reportMetadata['processedMetrics'];
         }
 
+        if (empty($reportMetadata['dimension'])) {
+            throw new Exception(sprintf('Reports like %s.%s which do not have a dimension are not supported by row evolution', $apiModule, $apiAction));
+        }
+
         $dimension = $reportMetadata['dimension'];
 
         return compact('metrics', 'dimension');

plugins/API/tests/RowEvolutionTest.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Plugins\API\tests;
+use Piwik\Plugins\API\RowEvolution;
+use Piwik\Tests\Fixture;
+
+/**
+ * @group API
+ * @group RowEvolutionTest
+ * @group Database
+ */
+class RowEvolutionTest extends \DatabaseTestCase
+{
+
+    public function setUp()
+    {
+        parent::setUp();
+        Fixture::createWebsite('2014-01-01 00:00:00');
+    }
+
+    /**
+     * @expectedException \Exception
+     * @expectedExceptionMessage Reports like VisitsSummary.get which do not have a dimension are not supported by row evolution
+     */
+    public function test_getRowEvolution_shouldTriggerAnException_IfReportHasNoDimension()
+    {
+        $rowEvolution = new RowEvolution();
+        $rowEvolution->getRowEvolution(1, 'day', 'last7', 'VisitsSummary', 'get');
+    }
+
+    public function test_getRowEvolution_shouldNotTriggerAnException_IfReportHasADimension()
+    {
+        $rowEvolution = new RowEvolution();
+        $table = $rowEvolution->getRowEvolution(1, 'day', 'last7', 'Actions', 'getPageUrls');
+        $this->assertNotEmpty($table);
+    }
+
+}