MAGETWO-58652: [GitHub] REST API multiselect attribute values are sent in an incompatible format and cannot be cleared #6120

Author: Alex Paliarush

app/code/Magento/Eav/Model/EavCustomAttributeTypeLocator/SimpleType.php

@@ -28,10 +28,14 @@ class SimpleType
      */
     public function getType($attribute)
     {
-        if (in_array($attribute->getAttributeCode(), $this->anyTypeAttributes)) {
+        $arrayFrontendInputs = ['multiselect'];
+        $frontendInput = $attribute->getFrontendInput();
+        if (in_array($attribute->getAttributeCode(), $this->anyTypeAttributes)
+            || in_array($frontendInput, $arrayFrontendInputs)
+        ) {
             return TypeProcessor::NORMALIZED_ANY_TYPE;
         }
-        $frontendInput = $attribute->getFrontendInput();
+
         $backendType = $attribute->getBackendType();
         $backendTypeMap = [
             'static' => TypeProcessor::NORMALIZED_ANY_TYPE,
@@ -41,11 +45,6 @@ public function getType($attribute)
             'datetime' => TypeProcessor::NORMALIZED_STRING_TYPE,
             'decimal' => TypeProcessor::NORMALIZED_DOUBLE_TYPE,
         ];
-        $arrayFrontendInputs = ['multiselect'];
-        $type = $backendTypeMap[$backendType];
-        if (in_array($frontendInput, $arrayFrontendInputs)) {
-            $type .= '[]';
-        }
-        return $type;
+        return $backendTypeMap[$backendType];
     }
 }