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Magento Using Collections, Filters and Manipulation Methods

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A collection is a Model type containing other Models, it is basically used in Magento to handle product lists (ie. from a category or a bundle option), but not only.

TO DO: Explain how Magento Implements a collection - Use this to explain how Magento implements a collection by looking at code in a model, so that people can learn to write their own collections

This is a simple example of loading some product collection from a category and ordering them on their product name using Magento’s API.

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  1. $collection->addAttributeToFilter('field_name', array(
  2.         'in' => array(1, 2, 3),
  3.         ));
  4.  
  5.     $collection->addAttributeToFilter('date_field', array(
  6.        'from' => '2000-09-10',
  7.         ));
  8.  
  9.     $collection->addAttributeToFilter('date_field', array(
  10.         'from' => '10 September 2000',
  11.         'from' => '11 September 2000',
  12.         'date' => true, // specifies conversion of comparison values
  13.         ));
  14.  
  15.     $collection->addAttributeToFilter('field_name', 1); // tests for equality
  16.  
  17.     // Add OR condition:
  18.     $collection->addAttributeToFilter(array(
  19.         array(
  20.             'attribute' => 'field_name',
  21.             'in'        => array(1, 2, 3),
  22.             ),
  23.         array(
  24.             'attribute' => 'date_field',
  25.             'from'      => '2000-09-10',
  26.             ),
  27.         ));

URL: http://www.magentocommerce.com/wiki/5_-_modules_and_development/catalog/using_collections_in_magento

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