Get users who has bought this product (MAGENTO) - magento

Question

Is it possible in magento to filter user based on the products they have bought?
For eg.
How can I get all the users who have bought product A from category B
mysql query like
SELECT users From table users, table products ..... WHERE user has purchased product A .
Please give some ideas, I needed to make this work.
Thanks

Answer 1

If you want an actual query, you can probably do something as simple as (add additional joins to get customer information from EAV):
SELECT DISTINCT o.customer_id FROM sales_flat_order_item i
INNER JOIN sales_flat_order o ON o.entity_id = i.order_id
WHERE o.customer_id IS NOT NULL
AND i.sku = 'some-product-sku'
Using Magento models, this should work for you:
<?php
require_once 'app/Mage.php';
/*
* Initialize Magento. Older versions may require Mage::app() instead.
*/
Mage::init();
/**
* Get all unique order IDs for items with a particular SKU.
*/
$orderItems = Mage::getResourceModel('sales/order_item_collection')
->addFieldToFilter('sku', 'some-product-sku')
->toArray(array('order_id'));
$orderIds = array_unique(array_map(
function($orderItem) {
return $orderItem['order_id'];
},
$orderItems['items']
));
/**
* Now get all unique customers from the orders of these items.
*/
$orderCollection = Mage::getResourceModel('sales/order_collection')
->addFieldToFilter('entity_id', array('in' => $orderIds))
->addFieldToFilter('customer_id', array('neq' => 'NULL'));
$orderCollection->getSelect()->group('customer_id');
/**
* Now get a customer collection for those customers.
*/
$customerCollection = Mage::getModel('customer/customer')->getCollection()
->addFieldToFilter('entity_id', array('in' => $orderCollection->getColumnValues('customer_id')));
/**
* Traverse the customers like any other collection.
*/
foreach ($customerCollection as $customer) {
var_dump($customer->getData());
}
It's pretty ugly though (instantiates multiple models, executes a bunch of queries under the covers), you could probably write your own model to make this -a lot- prettier.

Answer 2

You have to base your query on orders. If you want to do it by SQL query, you have to it by the following table:
sales_flat_quote, sales_flat_order_item to get the link between customer and product
catalog_category_product to get the link between category and product
catalog_product_entity to get the product id in function of the sku
...
Good luck

Answer 3

try these models
$orders = Mage::getModel('sales/order')->addAttributeToSelect('*')->getCollection();
$order_items = Mage::getResourceModel('sales/order_item_collection')
->addAttributeToSelect('sku')
->addAttributeToSelect('created_at')
->addAttributeToSelect('order_id')
->addAttributeToFilter('order_id', array('in' => $orders_ids))->load();