[TYPO3-commerce] Remove of deprecated method call get_parent_categorie()

[Benny Schimmer]

Hi list,

since i updated an installation to TYPO3 4.5 i get a lot of deprecation 
warnings:

tx_commerce_db_product->get_parent_categorie()
tx_commerce_db_product->get_parent_category() - use getParentCategories 
instead; note that getParentCategories will return an array

I fixed this in the attached Patch, but im not happy with this change.

The situation so far:
tx_commerce_pi1->initSingleView calls the method 
$this->product->get_masterparent_categorie()
This method is only a deprecated wrapper for getMasterparentCategory() so 
the change in the pi1 is ok i think.

tx_commerce_product->getMasterparentCategory() calls 
tx_commerce_db_product->get_parent_categorie (wrapper for 
get_parent_category).
There the category is selectec from the 'categories'-field from 
products-db-table. If the result is a comma-seperated list, the first value 
is returned.

Now:
Since the product->category relation is now stored in a mm table i changed 
the call of tx_commerce_db_product->get_parent_categorie to 
getParentCategories and i am returning the first array-element.

I did not change the behavior, but is this really reasonable to return the 
first category the product is associated with?

Greetings,

Benny 
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