How To Define Relation With Through

Hi all,

I have three tables,

product
-------
id int PK
code varchar
name varchar
unit varchar


category
-------
id int PK
code varchar
name varchar


product_category
---------------
id int PK
productFk FK to product(id)
categoryFk FK to category(id)


My relationship is
ProductCategory.php

'category' => array(self::BELONGS_TO, 'Category', 'categoryFk'),
'product' => array(self::BELONGS_TO, 'Product', 'productFk'),

Product.php

'productCategory' => array(self::HAS_MANY, 'ProductCategory', 'productFk'),

Category.php

'productCategory' => array(self::HAS_MANY, 'ProductCategory', 'categoryFk'),

Are they correct?

In addition,

1. how can I define the relation with through so that from product I can get its category?

2. how can I define the relation with through to get the first product sort by product name from the category?

Thanks in advance.

Daniel