Friday 02 July 2010 5:57:22 am

I am not quite sure what you need, but if you need to distinguish article objects which actually have an image uploaded you can use this extended_attribute_filter in your extension:

<?php
class eZExtendedImageFilter{ 
 function eZExtendedImageFilter(){  
  // Empty... 
 }
 function createSqlParts( $params ) {  
  $result = array( 'tables' => '', 'joins'  => '' );  
  if ( isset( $params['classes'] ) ) {   
   $classes = $params['classes'];  
  } else return;
  $attr = 'image';  
  if ( isset( $params['attr'] ) ) {   
   $attr = $params['attr'];  
  } 
  $attribute_ids = array();  
  foreach ($classes as $class) {   
   array_push($attribute_ids,eZContentObjectTreeNode::classAttributeIDByIdentifier( $class . '/' . $attr ));  
  }
  $class_cond = array();  
  foreach ($attribute_ids as $aid) {   
   if ($aid) {    
   array_push($class_cond, 'i1.contentclassattribute_id = '.$aid);   
   }  
  }
  $string_class_cond = implode(" OR ",$class_cond);  
  $filterSQL = array();  
  $filterSQL['from']  = ", ezcontentobject_attribute i1 ";  
  $filterSQL['where'] = " (i1.contentobject_id = ezcontentobject.id AND (" . $string_class_cond . ") AND i1.version = ezcontentobject_name.content_version AND i1.language_code = ezcontentobject_name.real_translation AND i1.data_text LIKE '%is_valid=\"1\"%' ) AND ";  
  return array( 'tables' => $filterSQL['from'], 'joins'  => $filterSQL['where'] ); 
 }
}
?>

Add this into extendedattributefilter.ini.append.php:

[ExtendedImageFilter]
#The name of the extension where the filtering code is defined.
ExtensionName=your_extension
#The name of the filter class.
ClassName=eZExtendedImageFilter
#The name of the method which is called to generate the SQL parts.
MethodName=createSqlParts
#The file which should be included (extension/myextension will automatically be prepended).
FileName=kernel/classes/ezimagefilter.php

To learn more about extended_attribute_filter look here: http://ez.no/doc/ez_publish/technical_manual/4_x/reference/modules/content/fetch_functions/list

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