- fixed bug in addXml builder for multivalue fields

- removed duplicate code in ReadOnly and ReadWrite document
- added a new unittest for testing XML building for multivalue fields

library/Solarium/Client/Request/Update.php

@@ -128,10 +128,15 @@ class Solarium_Client_Request_Update extends Solarium_Client_Request
             $xml .= '>';
 
             foreach ($doc->getFields() AS $name => $value) {
-                $xml .= '<field name="' . $name . '"';
-                $xml .= $this->attrib('boost', $doc->getFieldBoost($name));
-                $xml .= '>' . htmlspecialchars($value, ENT_NOQUOTES, 'UTF-8')
-                        . '</field>';
+                $boost = $doc->getFieldBoost($name);
+                if(is_array($value))
+                {
+                    foreach ($value AS $multival) {
+                        $xml .= $this->_buildFieldXml($name, $boost, $multival);
+                    }
+                } else {
+                    $xml .= $this->_buildFieldXml($name, $boost, $value);
+                }
             }
 
             $xml .= '</doc>';
@@ -142,6 +147,26 @@ class Solarium_Client_Request_Update extends Solarium_Client_Request
         return $xml;
     }
 
+    /**
+     * Build XML for a field
+     *
+     * Used in the add command
+     *
+     * @param string $name
+     * @param float $boost
+     * @param mixed $value
+     * @return string
+     */
+    protected function _buildFieldXml($name, $boost, $value)
+    {
+        $xml = '<field name="' . $name . '"';
+        $xml .= $this->attrib('boost', $boost);
+        $xml .= '>' . htmlspecialchars($value, ENT_NOQUOTES, 'UTF-8');
+        $xml .= '</field>';
+
+        return $xml;
+    }
+
     /**
      * Build XML for a delete command
      *

library/Solarium/Document/ReadOnly.php

@@ -150,7 +150,7 @@ class Solarium_Document_ReadOnly
      */
     public function offsetExists($offset)
     {
-        return isset($this->_fields[$offset]);
+        return ($this->__get($offset) !== null);
     }
 
     /**
@@ -172,7 +172,7 @@ class Solarium_Document_ReadOnly
      */
     public function offsetGet($offset)
     {
-        return isset($this->_fields[$offset]) ? $this->_fields[$offset] : null;
+        return $this->__get($offset);
     }
 
 }
\ No newline at end of file

library/Solarium/Document/ReadWrite.php

@@ -218,15 +218,8 @@ class Solarium_Document_ReadWrite extends Solarium_Document_ReadOnly
      */
     public function __set($name, $value)
     {
-        if (is_array($value)) {
-            $this->removeField($name); // remove any existing value(s)
-            foreach ($value AS $multival) {
-                $this->addField($name, $multival);
-            }
-        } else {
         $this->setField($name, $value);
     }
-    }
 
     /**
      * Unset field value

tests/Solarium/Client/Request/UpdateTest.php

@@ -103,6 +103,19 @@ class Solarium_Client_Request_UpdateTest extends PHPUnit_Framework_TestCase
         );
     }
 
+    public function testBuildAddXmlMultivalueField()
+    {
+        $command = new Solarium_Query_Update_Command_Add;
+        $command->addDocument(new Solarium_Document_ReadWrite(array('id' => array(1,2,3), 'text' => 'test < 123 > test')));
+
+        $request = new Solarium_Client_Request_Update($this->_options, $this->_query);
+
+        $this->assertEquals(
+            '<add><doc><field name="id">1</field><field name="id">2</field><field name="id">3</field><field name="text">test &lt; 123 &gt; test</field></doc></add>',
+            $request->buildAddXml($command)
+        );
+    }
+
     public function testBuildAddXmlSingleDocumentWithBoost()
     {
         $doc = new Solarium_Document_ReadWrite(array('id' => 1));