Throw deprecation notice on non-abstract parent when it's not in the map

Author: supersmile2009

src/JMS/Serializer/Metadata/ClassMetadata.php

@@ -268,20 +268,22 @@ public function unserialize($str)
 
     private function handleDiscriminatorProperty()
     {
-        if (
-            $this->discriminatorMap
-            && !$this->reflection->isAbstract()
-            && !$this->reflection->isInterface()
-        ) {
-            if (
-                false === ($typeValue = array_search($this->name, $this->discriminatorMap, true))
-                && $this->discriminatorBaseClass !== $this->name
-            ) {
-                throw new \LogicException(sprintf(
-                    'The sub-class "%s" is not listed in the discriminator of the base class "%s".',
-                    $this->name,
-                    $this->discriminatorBaseClass
-                ));
+        if ($this->discriminatorMap && !$this->reflection->isAbstract() && !$this->reflection->isInterface()) {
+            if (false === $typeValue = array_search($this->name, $this->discriminatorMap, true)) {
+                if ($this->discriminatorBaseClass === $this->name) {
+                    @trigger_error(
+                        'Discriminator map was configured on non-abstract parent class but parent class'
+                        .' was not included into discriminator map. It will throw exception in next major version.'
+                        .' Either declare parent as abstract class or add it into discriminator map.',
+                        E_USER_DEPRECATED
+                    );
+                } else {
+                    throw new \LogicException(sprintf(
+                        'The sub-class "%s" is not listed in the discriminator of the base class "%s".',
+                        $this->name,
+                        $this->discriminatorBaseClass
+                    ));
+                }
             }
 
             $this->discriminatorValue = $typeValue;