Use custom generate alias callback.

src/Netzmacht/Contao/Leaflet/Dca/Helper.php

@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @package    dev
+ * @author     David Molineus <david.molineus@netzmacht.de>
+ * @copyright  2015 netzmacht creative David Molineus
+ * @license    LGPL 3.0
+ * @filesource
+ *
+ */
+
+namespace Netzmacht\Contao\Leaflet\Dca;
+
+use Netzmacht\Contao\Toolkit\Dca;
+use Netzmacht\Contao\Toolkit\Dca\Callback\GenerateAliasCallback;
+
+/**
+ * Helper class for dca functions.
+ *
+ * @package Netzmacht\Contao\Leaflet\Dca
+ */
+class Helper
+{
+    /**
+     * Generate an alias callback which creates a valid javascript var name.
+     *
+     * @param string $table  The table.
+     * @param string $column The value column,
+     *
+     * @return GenerateAliasCallback
+     */
+    public static function createGenerateAliasCallback($table, $column)
+    {
+        $callback = Dca::createGenerateAliasCallback($table, $column);
+        $callback->getGenerator()->addFilter(
+            function ($value) {
+                return str_replace('-', '_', $value);
+            }
+        );
+
+        return $callback;
+    }
+}