GraphQl-93: Implement support for variables in query

-- Fixes after CR

Author: naydav

lib/internal/Magento/Framework/GraphQl/Config.php

@@ -83,11 +83,11 @@ public function getConfigElement(string $configElementName) : ConfigElementInter
     /**
      * Return all type names declared in a GraphQL schema's configuration and their type.
      *
+     * Format is ['name' => 'example value', 'type' = 'example value']
+     *
      * @return array $types
-     *  name string
-     *  type string
      */
-    public function getDeclaredTypeNames() : array
+    public function getDeclaredTypes() : array
     {
         $types = [];
         foreach ($this->configData->get(null) as $item) {

lib/internal/Magento/Framework/GraphQl/Config/Element/InputFactory.php

@@ -73,7 +73,7 @@ public function createFromConfigData(array $data): ConfigElementInterface
     }
 
     /**
-     * Create type object based off array of configured GraphQL InputType data.
+     * Create input type object based off array of configured GraphQL InputType data.
      *
      * Type data must contain name and the type's fields. Optional data includes description.
      *

lib/internal/Magento/Framework/GraphQl/Query/Fields.php

@@ -44,7 +44,7 @@ public function setQuery($query, array $variables = null)
                 ]
             );
             if (isset($variables)) {
-                $queryFields = array_merge($queryFields, $this->getVariables($variables));
+                $queryFields = array_merge($queryFields, $this->extracttVariables($variables));
             }
         } catch (\Exception $e) {
             // If a syntax error is encountered do not collect fields
@@ -75,12 +75,12 @@ public function getFieldsUsedInQuery()
      *
      * @return string[]
      */
-    private function getVariables(array $variables): array
+    private function extracttVariables(array $variables): array
     {
         $fields = [];
         foreach ($variables as $key => $value){
             if (is_array($value)){
-                $fields = array_merge($fields, $this->getVariables($value));
+                $fields = array_merge($fields, $this->extracttVariables($value));
             }
             $fields[$key] = $key;
         }

lib/internal/Magento/Framework/GraphQl/Schema/Type/TypeRegistry.php

@@ -71,7 +71,10 @@ public function get(string $typeName): TypeInterface
             $configElementClass = get_class($configElement);
             if (!isset($this->configToTypeMap[$configElementClass])) {
                 throw new GraphQlInputException(
-                    new Phrase("Type for '{$configElementClass}' has not declared.")
+                    new Phrase(
+                        "No mapping to Webonyx type is declared for '%1' config element type.",
+                        [$configElementClass]
+                    )
                 );
             }