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POHow to select specific fields with aliases using joinTable or joinField in Magento
 

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  1. POHow to select specific fields with aliases using joinTable or joinField in Magento
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    <p>I want to pre-filter* data in the invoice grid visible in Magento's admin panel. </p> <p><a href="https://stackoverflow.com/questions/3915148/how-to-get-data-for-an-entity-for-example-customer-from-eav-attribute-table-to">Here</a> is a question that I asked earlier, and this one is related to the solution presented for that, hence it might act as a good explanation.</p> <p>So, I am modifying the Mage_Adminhtml_Block_Sales_Invoice_Grid::_prepareCollection method so that it first fetches customer referred by the logged in admin. Then it will fetch orders from these customer(s) - ideally only the order id's - Then join this collection to <em>sales/order_invoice_grid</em>, to get invoices to be listed for this admin.</p> <p>Based on the last answer and using <a href="http://docs.magentocommerce.com/Mage_Eav/Mage_Eav_Model_Entity_Collection_Abstract.html" rel="nofollow noreferrer">these</a> docs, following are 3 ways I have tried joining this information: (Code Sample 1)</p> <pre><code>$collection = Mage::getResourceModel('customer/customer_collection'); $collection-&gt;joinTable('sales/order_grid', 'customer_id=entity_id', array('*')); $collection-&gt;joinTable('sales/invoice_grid', 'order_id=main_table.entity_id', array('*')); </code></pre> <p>When I do the above, I see the following error:</p> <pre><code>A joint field with this alias (0) is already declared. #0 /var/www/magento/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(706): Mage::exception('Mage_Eav', 'A joint field w...') #1 /var/www/magento/app/code/local/Myproject/Adminhtml/Block/Sales/Invoice/Grid.php(41): Mage_Eav_Model_Entity_Collection_Abstract-&gt;joinTable('sales/invoice_g...', 'order_id=main_t...', Array) #2 /var/www/magento/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php(576): Myproject_Adminhtml_Block_Sales_Invoice_Grid-&gt;_prepareCollection() #3 /var/www/magento/app/code/core/Mage/Adminhtml/Block/Widget/Grid.php(582): Mage_Adminhtml_Block_Widget_Grid-&gt;_prepareGrid() </code></pre> <p>If I remove the second call to joinTable, the above code works, but it is not what I want.</p> <p>The other method I tried is with this code:</p> <pre><code>$collection = Mage::getResourceModel('customer/customer_collection'); $collection-&gt;joinTable('sales/order_grid', 'customer_id=entity_id', array('entity_id as order_entity_id')); $collection-&gt;joinTable('sales/invoice_grid', 'order_id=main_table.entity_id', array('*')); </code></pre> <p>Here the error appears in the second line, where I am actually trying to alias the field order.entity_id so that it does not conflict with invoice tables entity_id. However that produces an error like:</p> <blockquote> <p>Item (Mage_Customer_Model_Customer) with the same id "1" already exist</p> </blockquote> <p>I only need order id's so that I can get related invoices, which suggests that I can also use joinField function, which I tried as follows:</p> <pre><code>$collection = Mage::getResourceModel('customer/customer_collection'); $collection-&gt;joinField('order_entity_id', 'sales/order_grid', 'entity_id', 'customer_id=entity_id' , null, 'left'); </code></pre> <p>But it gives me the following error:</p> <p>Item (Mage_Customer_Model_Customer) with the same id "1" already exist</p> <p>I am looking for a solution that joins customer->invoices.</p> <hr> <p><em>By pre-filter I mean that data listed in the grid is filtered even before anything is presented in the grid.</em></p> <hr> <p>Ok, now my code looks like:</p> <pre><code>$collection = Mage::getResourceModel('customer/customer_collection'); $collection-&gt;joinTable('sales/order_grid', 'customer_id=entity_id', array('entity_id' =&gt; 'order_entity_id')); </code></pre> <p>And the error that I get is:</p> <pre><code>SELECT `e`.*, `sales_flat_order_grid`.`order_entity_id` AS `entity_id` FROM `customer_entity` AS `e` INNER JOIN `sales_flat_order_grid` ON (sales_flat_order_grid.customer_id=e.entity_id) WHERE (e.entity_type_id = '1') ORDER BY `e`.`created_at` desc, `e`.`created_at` desc LIMIT 20 SQLSTATE[42S22]: Column not found: 1054 Unknown column 'sales_flat_order_grid.order_entity_id' in 'field list' </code></pre> <hr>
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