Hello, Sara

You can call orm methods without use of odoo orm with the use of xmlrpc call. You have to connect your server & Database to through xmlrpc methods written as python script.

Reference Document: \https\:\/\/www\.odoo\.com\/documentation\/8\.0\/api\_integration\.html\\\

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Sample\ script\:\ \http\:\/\/findnerd\.com\/list\/view\/How\-to\-Use\-XML\-RPC\-of\-Odoo\-8\/7666\/\\\

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Just go through it . Best of luck 

Hello, You can create a class object to use a view model and write a action definition in controller to execute the logic with that model.. 

Example:

class test(object):

     def __init__(self):

         ........