Fix problem when 1 column identifier in propel is a string.

The ModelChoiceList thinks it can be used as the index of the ChoiceList, when it can only be used if it is an integer.

src/Symfony/Bridge/Propel1/Form/ChoiceList/ModelChoiceList.php

@@ -45,6 +45,13 @@ class ModelChoiceList extends ObjectChoiceList
      */
     private $loaded = false;
 
+    /**
+     * Whether to use the identifier for index generation
+     *
+     * @var Boolean
+     */
+    private $identifierAsIndex = false;
+
     /**
      * @param string         $class
      * @param string         $labelPath
@@ -69,6 +76,13 @@ public function __construct($class, $labelPath = null, $choices = null, $queryOb
             $choices = array();
         }
 
+        if (1 === count($this->identifier)) {
+          // TODO this should be current($this->identifier)->isInteger() when propel ColumnMap contains the isInteger function
+          if ($this->isInteger(current($this->identifier))) {
+            $this->identifierAsIndex = true;
+          }
+        }
+
         parent::__construct($choices, $labelPath, array(), $groupPath);
     }
 
@@ -224,7 +238,7 @@ public function getIndicesForChoices(array $models)
             // know that the IDs are used as indices
 
             // Attention: This optimization does not check choices for existence
-            if (1 === count($this->identifier)) {
+            if ($this->identifierAsIndex) {
                 $indices = array();
 
                 foreach ($models as $model) {
@@ -259,7 +273,7 @@ public function getIndicesForValues(array $values)
             // know that the IDs are used as indices and values
 
             // Attention: This optimization does not check values for existence
-            if (1 === count($this->identifier)) {
+            if ($this->identifierAsIndex) {
                 return $this->fixIndices($values);
             }
 
@@ -283,7 +297,7 @@ public function getIndicesForValues(array $values)
      */
     protected function createIndex($model)
     {
-        if (1 === count($this->identifier)) {
+        if ($this->identifierAsIndex) {
             return current($this->getIdentifierValues($model));
         }
 
@@ -351,4 +365,15 @@ private function getIdentifierValues($model)
 
         return $model->getPrimaryKeys();
     }
+
+    /**
+     * Whether this column in an integer
+     * TODO we could add this function to propel ColumnMap class instead
+     *
+     * @return boolean
+     */
+    private function isInteger($col)
+    {
+      return $col->getType() === \PDO::PARAM_INT;
+    }
 }