- Added partial support for Index as primary keys

src/EntityTrait.php

@@ -144,13 +144,27 @@ trait EntityTrait {
             return false;
         }
 
-        if ( null === $pkField = $this->resolveEntity()->getPrimaryKeyField($this) ) {
-            throw new Exception\EntityPrimaryKeyUnknown(sprintf("Entity %s has no field containing attributes 'primary_key'", static::class));
+        if ( null === $pkField = $this->resolveEntity()->getPrimaryKeyField() ) {
+            if ( null !== $compoundKeyFields = $this->resolveEntity()->getCompoundKeyFields() ) {
+                $loaded = false;
+
+                foreach ($compoundKeyFields->column as $column) {
+                    $field = $this->resolveEntity()->field($column);
+
+                    if (! $field->allowsNull() ) {
+                        $loaded |= isset($this->{$field->name});
+                    }
+                }
+
+                return $loaded;
+            };
+        }
+        else {
+            $key = key($pkField);
+            return isset($this->$key);
         }
 
-        $key = key($pkField);
-
-        return isset($this->$key);
+        throw new Exception\EntityPrimaryKeyUnknown(sprintf("Entity %s has no field containing attributes 'primary_key'", static::class));
     }
 
     #[Ignore]