How do I create a value then add it to the _prepareColumns() function?

I would like to work out a value then add it to a row that is coming form the database.

  • Can you be more specific? Do you mean that you want to take a value from field X off the table, manipulate it, and render it into column C? – Rick Buczynski Nov 21 '14 at 14:33
  • Yes that is what I want to do – daktau Nov 21 '14 at 15:14
  • ok - in that case, see my answer below – Rick Buczynski Nov 21 '14 at 15:23

In _prepareColumns for your desired "dynamic column," try this:

$this->addColumn('my_column', array(
    'header'    => Mage::helper('module')->__('My Column'),
    'type'      => 'text',
    'renderer'  => 'module/adminhtml_column_renderer_mycolumn'

Notice the renderer element, which points to an admin block (a column renderer). Construct your renderer like this:

class Namespace_Module_Block_Adminhtml_Column_Renderer_Mycolumn 
    extends Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract 

    public function render(Varien_Object $row) 
        // $row is your model
        return $row->getEnabled() ? '<strong>ENABLED</strong>' : '<em>DISABLED</em>';


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