I'm not a new programmer (I'd say advanced beginner/intermediate) but I'm 
quite new to Cake and MVC in general. 

I've decided best way to learn CakePHP and MVC is to take an existing 
(functional, live) project and port it to Cake for kicks. Get the grand 
tour of all the basics. 

In my existing project I have a number of utility classes that are used by 
the other classes. 2 of them are an Item class and a Banking class. Item 
obviously contains all the information about a user's inventory, plus 
handles updating/deducting items, as well as using items. Banking does just 
that- tracks a user's currency and handles transactions. Banking is used 
between the Shop systems, Item is used by Shop and various action classes. 
So I need a way to share their functionality between all the various other 
controllers that require them. 

Simple example would be the user wants to buy an item from the shop, have 
to verify the item is in stock, the item's price, that the player has the 
currency to pay for it, deliver the item, deduct the payment and deduct the 
item from shop inventory. While a different Controller (say, Toll Bridge) 
needs the Banking functions to verify the user has the funds to pay the 
toll, then debit the transaction.

It SOUNDS like what I need to do is to create Banking & Item Components, 
then the other controllers can make use of them as needed. However, this 
would also require including various queries to chat with the database. The 
CakePHP example on Components only shows a simple math operation with 
passed params, and says nothing about if using Components as little 
"bundles" of functionality that involve their own validations and database 
interactions (although this is strongly implied) There is some conversation 
on the 'net that what actually needs to happen is Banking and Item should 
be controllers, and they get imported as needed. 

What's the best way to go about this? 

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