From 3392971ce5b390a6488a783547a03d6e37e3b003 Mon Sep 17 00:00:00 2001
From: Taylor Otwell <taylorotwell@gmail.com>
Date: Wed, 22 Jun 2011 21:11:35 -0500
Subject: [PATCH] added dynamic finders to fluent query builder and eloquent.

---
 system/db/query.php         | 14 +++++++++
 system/db/query/dynamic.php | 60 +++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 system/db/query/dynamic.php

diff --git a/system/db/query.php b/system/db/query.php
index 3e28f20d..0d053554 100644
--- a/system/db/query.php
+++ b/system/db/query.php
@@ -500,6 +500,20 @@ class Query {
 	 */
 	public function __call($method, $parameters)
 	{
+		// ---------------------------------------------------------
+		// Dynamic methods allows the building of very expressive
+		// queries. All dynamic methods start with "where_".
+		//
+		// Ex: DB::table('users')->where_email($email)->first();
+		// ---------------------------------------------------------
+		if (strpos($method, 'where_') === 0)
+		{
+			return Query\Dynamic::build($method, $parameters, $this);
+		}
+
+		// ---------------------------------------------------------
+		// Handle any of the aggregate functions.
+		// ---------------------------------------------------------
 		if (in_array($method, array('count', 'min', 'max', 'avg', 'sum')))
 		{
 			return ($method == 'count') ? $this->aggregate(Str::upper($method), '*') : $this->aggregate(Str::upper($method), $parameters[0]);
diff --git a/system/db/query/dynamic.php b/system/db/query/dynamic.php
new file mode 100644
index 00000000..ea90e2ea
--- /dev/null
+++ b/system/db/query/dynamic.php
@@ -0,0 +1,60 @@
+<?php namespace System\DB\Query;
+
+use System\Str;
+
+class Dynamic {
+
+	/**
+	 * Add conditions to a query from a dynamic method call.
+	 *
+	 * @param  string  $method
+	 * @param  array   $parameters
+	 * @param  Query   $query
+	 * @return Query
+	 */
+	public static function build($method, $parameters, $query)
+	{
+		// ---------------------------------------------------------
+		// Strip the "where_" off of the method.
+		// ---------------------------------------------------------
+		$method = substr($method, 6);
+
+		// ---------------------------------------------------------
+		// Split the column names from the connectors.
+		// ---------------------------------------------------------
+		$segments = preg_split('/(_and_|_or_)/i', $method, -1, PREG_SPLIT_DELIM_CAPTURE);
+
+		// ---------------------------------------------------------
+		// The connector variable will determine which connector
+		// will be used for the condition. We'll change it as we
+		// come across new connectors in the dynamic method string.
+		//
+		// The index variable helps us get the correct parameter
+		// value for the where condition. We increment it each time
+		// we add a condition.
+		// ---------------------------------------------------------
+		$connector = 'AND';
+
+		$index = 0;
+
+		// ---------------------------------------------------------
+		// Iterate through each segment and add the conditions.
+		// ---------------------------------------------------------
+		foreach ($segments as $segment)
+		{
+			if ($segment != '_and_' and $segment != '_or_')
+			{
+				$query->where($segment, '=', $parameters[$index], $connector);
+
+				$index++;
+			}
+			else
+			{
+				$connector = trim(Str::upper($segment), '_');
+			}
+		}
+
+		return $query;
+	}
+
+}
\ No newline at end of file