BUGFIX: Allow to define zero as valid filter value via TypoScript

The configured filter is no longer filtered, it's up to the integrator
to provide proper configuration. Therefore `0` is now a valid and
respected filter value.

Resolves: #163

Classes/Domain/Search/SearchService.php

@@ -126,9 +126,7 @@ class SearchService
 
             ArrayUtility::mergeRecursiveWithOverrule(
                 $filter,
-                $this->configuration->get('searching.filter'),
+                $this->configuration->get('searching.filter')
-                true,
-                false
             );
 
             $searchRequest->setFilter($filter);

Documentation/source/changelog.rst

@@ -13,3 +13,4 @@ Changelog
    changelog/20180308-131-respect-page-cache-clear
    changelog/20180308-introduce-php70-type-hints
    changelog/20180306-120-facet-configuration
+   changelog/20180926-163-allow-zero-as-typoscript-filter-value

Documentation/source/changelog/20180926-163-allow-zero-as-typoscript-filter-value.rst

@@ -0,0 +1,10 @@
+Bugfix 163 "It's not possible to configure a filter via TS with value 0 - zero"
+===============================================================================
+
+Prior to the change it was not possible to define a filter while searching, via
+TypoScript, with the value `0`. `0` was filtered as empty value.
+
+Now the configured filter is no longer filtered, it's up to the integrator to provide
+proper configuration. Therefore `0` is now a valid and respected filter value.
+
+See :issue:`163`.

Tests/Unit/Domain/Search/SearchServiceTest.php

@@ -164,6 +164,33 @@ class SearchServiceTest extends AbstractUnitTestCase
         $this->subject->search($searchRequest);
     }
 
+    /**
+     * @test
+     */
+    public function configuredFilterWithValueZeroAreAddedToRequestWithoutAnyFilter()
+    {
+        $this->configuration->expects($this->any())
+            ->method('getIfExists')
+            ->withConsecutive(['searching.size'], ['searching.facets'])
+            ->will($this->onConsecutiveCalls(null, null));
+        $this->configuration->expects($this->any())
+            ->method('get')
+            ->will($this->onConsecutiveCalls(
+                ['property' => '0'],
+                $this->throwException(new InvalidArgumentException)
+            ));
+
+        $this->connection->expects($this->once())
+            ->method('search')
+            ->with($this->callback(function ($searchRequest) {
+                return $searchRequest->getFilter() === ['property' => '0'];
+            }))
+            ->willReturn($this->getMockBuilder(SearchResultInterface::class)->getMock());
+
+        $searchRequest = new SearchRequest('SearchWord');
+        $this->subject->search($searchRequest);
+    }
+
     /**
      * @test
      */
@@ -220,34 +247,6 @@ class SearchServiceTest extends AbstractUnitTestCase
         $this->subject->search($searchRequest);
     }
 
-    /**
-     * @test
-     */
-    public function emptyConfiguredFilterIsNotChangingRequestWithExistingFilter()
-    {
-        $this->configuration->expects($this->any())
-            ->method('getIfExists')
-            ->withConsecutive(['searching.size'], ['searching.facets'])
-            ->will($this->onConsecutiveCalls(null, null));
-        $this->configuration->expects($this->any())
-            ->method('get')
-            ->will($this->onConsecutiveCalls(
-                ['anotherProperty' => ''],
-                $this->throwException(new InvalidArgumentException)
-            ));
-
-        $this->connection->expects($this->once())
-            ->method('search')
-            ->with($this->callback(function ($searchRequest) {
-                return $searchRequest->getFilter() === ['anotherProperty' => 'anything'];
-            }))
-            ->willReturn($this->getMockBuilder(SearchResultInterface::class)->getMock());
-
-        $searchRequest = new SearchRequest('SearchWord');
-        $searchRequest->setFilter(['anotherProperty' => 'anything']);
-        $this->subject->search($searchRequest);
-    }
-
     /**
      * @test
      */