Adding a monetary field to a model

Odoo has special support for monetary values related to a currency. Let's see how we can use this in a model.

Getting ready

We will continue to use the my_library add-on module from the previous recipe.

How to do it...

The monetary field needs a complementary currency field to store the currency for the amounts.

my_library already has models/library_book.py, which defines a basic model. We will edit this to add the required fields:

1. Add the field to store the currency that is to be used:

   class LibraryBook(models.Model): 
       # ... 
       currency_id = fields.Many2one( 
           'res.currency', string='Currency') 

2. Add the monetary field to store the amount:

   class LibraryBook(models.Model): 
       # ... 
       retail_price = fields.Monetary( 
           ...