How to get all products with one PhotoSmall and at least one PhotoBig

Hi, I have a product.

The product can have one 'small' photo, and several 'big' photos

The product is associated to photo using one table, aliases and conditions.

I need a query to find all product with one 'small' photo and *at least* one 'big' photo

I've tried the following code without success

    $this->Product->recursive = -1;

    $conditions = array('Product.category_id'=> $cats);

    $joins = array(

        array('table' => 'photos',

            'alias' => 'PhotoBig',

            'type' => 'INNER',

            'conditions' => array(

                'Product.id = PhotoBig.product_id',

            )

        ),

        array('table' => 'photos',

            'alias' => 'PhotoSmall',

            'type' => 'INNER',

            'conditions' => array(

                'Product.id = PhotoSmall.product_id',

            )

        )

    );

    $this->paginate = array(

        'limit' => 12,

        'conditions' => $conditions,

        'joins' => $joins,

    );

    // app/models/product.php

    <?php

    class Product extends AppModel {

   var $name = 'Product';

   //The Associations below have been created with all possible keys, those that are not needed can be removed

   var $hasOne = array(

       'PhotoSmall' => array(

           'className' => 'Photo',

   'foreignKey' => 'product_id',

   'dependent' => true,

   'conditions' => 'PhotoSmall.tipo = "small"',

       ));

        var $hasMany = array(

   'PhotoBig' => array(

   'className' => 'Photo',

   'foreignKey' => 'product_id',

   'dependent' => true,

   'conditions' => 'PhotoBig.tipo = "big"',

   'order' => 'PhotoBig.order',

   ));

    }

    <?php

    // app/models/photo.php

    class Photo extends AppModel {

        var $name = 'Photo';

        var $actsAs = array(

            'FileUpload.FileUpload' => array(

                'uploadDir' => 'files/products',

            ),

        );

        var $belongsTo = array('Product');

        

        

        function beforeSave($options = array()) {

            if(!empty($this->data)) {

                if($this->alias == 'PhotoBig') {

                    $this->data[$this->alias]['type'] = 'big';

                }

                else {

                    $this->data[$this->alias]['type'] = 'small';

                }

            }

            return true;

        }

    }

If there's a better schema (or way) to do this I'll be glad to hear you.

Thanks

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