Added Eloquent 2.

Signed-off-by: Taylor Otwell <taylorotwell@gmail.com>

laravel/database/eloquent/relationships/belongs_to.php

@@ -0,0 +1,83 @@
+<?php namespace Laravel\Database\Eloquent\Relationships;
+
+class Belongs_To extends Relationship {
+
+	/**
+	 * Get the properly hydrated results for the relationship.
+	 *
+	 * @return Model
+	 */
+	public function results()
+	{
+		return parent::first();
+	}
+
+	/**
+	 * Set the proper constraints on the relationship table.
+	 *
+	 * @return void
+	 */
+	protected function constrain()
+	{
+		$foreign = $this->base->get_attribute($this->foreign);
+
+		$this->table->where($this->base->key(), '=', $foreign);
+	}
+
+	/**
+	 * Initialize a relationship on an array of parent models.
+	 *
+	 * @param  array   $parents
+	 * @param  string  $relationship
+	 * @return void
+	 */
+	public function initialize(&$parents, $relationship)
+	{
+		foreach ($parents as &$parent)
+		{
+			$parent->relationships[$relationship] = null;
+		}
+	}
+
+	/**
+	 * Set the proper constraints on the relationship table for an eager load.
+	 *
+	 * @param  array  $results
+	 * @return void
+	 */
+	public function eagerly_constrain($results)
+	{
+		$keys = array();
+
+		// Inverse one-to-many relationships require us to gather the keys from the
+		// parent models and use those keys when setting the constraint since we
+		// are looking for the parent of a child model in this relationship.
+		foreach ($results as $result)
+		{
+			$keys[] = $result->{$this->foreign_key()};
+		}
+
+		$this->table->where_in($this->model->key(), array_unique($keys));
+	}
+
+	/**
+	 * Match eagerly loaded child models to their parent models.
+	 *
+	 * @param  array  $children
+	 * @param  array  $parents
+	 * @return void
+	 */
+	public function match($relationship, &$children, $parents)
+	{
+		$foreign = $this->foreign_key();
+
+		foreach ($children as &$child)
+		{
+			if (array_key_exists($child->$foreign, $parents))
+			{
+				$child->relationships[$relationship] = $parents[$child->$foreign];
+			}
+		}
+	}
+
+}