Magento custom collection filter and sort   We have already know how to filter magento product ,customer,wishlist,order  collection  fields filters. But whenever we are working on  non-exiting model collection, then we facing problem.Here i have put some tricks how you can filter a custom collection by a field.In post,i have working on a writing how a custom collection is filter by a filed and how the collection will filter. Suppose a custom collection is #Mage::getModel('[ModulePrefix/Entities]')->getCollection(); $collection=Mage::getModel('[custommodule/customemodule]')->getCollection(); For add addFieldToSelect('*') at that Collection for retrieves all field value for a module is Then want to filter that collection by a field name ‘age’ then use $collection->addFieldToSelect('age'); For add for sort by a…