We're developing modules for our company and since we use CAD currency I want to enable it in the system. How can I do that from a module?

EDIT:

I can believe this is taking so long to accomplish this little task!

I get the following error:

ParseError: "Invalid field 'name' in leaf "<osv.ExtendedLeaf: ('name', '=', 'CAD') on res_currency (ctx: )>"" while parsing file:///C:/Users/laflammm/Desktop/GitHub/addons_tc/canadian_data/data/res_currency.xml:4, near
<function model="res.currency" name="_enable_currencies"/>

I don't get it... when I check the fields of res.currency, I only see those:

{
'create_uid': <openerp.osv.fields.many2one object at 0x0000000009A8D138>, 
'create_date': <openerp.osv.fields.datetime object at 0x0000000009A8C3C8>, 
'id': <openerp.osv.fields.integer object at 0x0000000009A8C588>, 
'write_date': <openerp.osv.fields.datetime object at 0x0000000009A8C4A8>, 
'write_uid': <openerp.osv.fields.many2one object at 0x0000000009A8D228>
}

Where are the name, rounding, symbol, position and active fields?? In the fields from res.currency are from the base modules. What's going on??

I have the following files:

res_currency.py

from import openerp models


class Currency(models.Model):
    _name = "res.currency"

    def _enable_currencies(self, cr, uid, ids=Nonecontext=None, ):
        cad_currency_ids = self.search(cr, uid, [('name', '=', 'CAD')])

        if cad_currency_ids:
            self.write(cr, uid, cad_currency_ids, {'active' : 'True'})

res_currency.xml

<openerp>
    <data>
        <function model="res.currency" name="_enable_currencies"/>
    </data>
</openerp>

__openerp__.py

{
    'name'       :"Canadian data" ,
    'description':"Create the canadian provinces and territories plus activate CAD currency." ,
    'author'     :"Transcontinental" ,
    'category'   :'' ,
    'version'    :'1.1' ,
    'depends'    : [],
    'data'       : [
        'res_currency.xml',
    ],
    'auto_install': False,
    'installable': True,
}

__init__.py

import res_currency