[graphql] Add graphql filter with multiple values (#2070)

* add falling test for filter with multiple values

* update graphql filter to support multiple values

* replace array prefix by _list suffix

Author: ArnoudThibaut

features/graphql/filters.feature

@@ -154,3 +154,28 @@ Feature: Collections filtering
     And the header "Content-Type" should be equal to "application/json"
     And the JSON node "data.dummies.edges[0].node.name" should be equal to "Dummy #2"
     And the JSON node "data.dummies.edges[1].node.name" should be equal to "Dummy #1"
+
+  @createSchema
+  Scenario: Retrieve a collection filtered using the related search filter with two values and exact strategy
+    Given there are 3 dummy objects with relatedDummy
+    When  I send the following GraphQL request:
+    """
+    {
+      dummies(relatedDummy_name_list: ["RelatedDummy #1", "RelatedDummy #2"]) {
+        edges {
+          node {
+            id
+            name
+            relatedDummy {
+              name
+            }
+          }
+        }
+      }
+    }
+    """
+    Then the response status code should be 200
+    And the header "Content-Type" should be equal to "application/json"
+    And the JSON node "data.dummies.edges" should have 2 element
+    And the JSON node "data.dummies.edges[0].node.relatedDummy.name" should be equal to "RelatedDummy #1"
+    And the JSON node "data.dummies.edges[1].node.relatedDummy.name" should be equal to "RelatedDummy #2"

src/GraphQl/Resolver/Factory/CollectionResolverFactory.php

@@ -162,13 +162,16 @@ private function getSubresource(string $rootClass, array $rootResolvedFields, ar
     private function getNormalizedFilters(array $args): array
     {
         $filters = $args;
+
         foreach ($filters as $name => $value) {
             if (\is_array($value)) {
+                if (strpos($name, '_list')) {
+                    $name = substr($name, 0, \strlen($name) - \strlen('_list'));
+                }
                 $filters[$name] = $this->getNormalizedFilters($value);
-                continue;
             }
 
-            if (strpos($name, '_')) {
+            if (\is_string($name) && strpos($name, '_')) {
                 // Gives a chance to relations/nested fields.
                 $filters[str_replace('_', '.', $name)] = $value;
             }

src/GraphQl/Type/SchemaBuilder.php

@@ -231,12 +231,15 @@ private function getResourceFieldConfiguration(string $resourceClass, ResourceMe
                         $filterType = \in_array($value['type'], Type::$builtinTypes, true) ? new Type($value['type'], $nullable) : new Type('object', $nullable, $value['type']);
                         $graphqlFilterType = $this->convertType($filterType, false, null, $depth);
 
-                        if ('[]' === $newKey = substr($key, -2)) {
-                            $key = $newKey;
+                        if ('[]' === substr($key, -2)) {
                             $graphqlFilterType = GraphQLType::listOf($graphqlFilterType);
+                            $key = substr($key, 0, -2).'_list';
                         }
 
                         parse_str($key, $parsed);
+                        if (array_key_exists($key, $parsed) && \is_array($parsed[$key])) {
+                            $parsed = [$key => ''];
+                        }
                         array_walk_recursive($parsed, function (&$value) use ($graphqlFilterType) {
                             $value = $graphqlFilterType;
                         });