OpenERP Functional Binary Field.py

import base64
from osv import osv, fields

class my_class(osv.osv_memory):

    def get_file(self, cr, uid, ids, field_name=None, arg=None, context=None):
        result = dict.fromkeys(ids)
        for record_browse in self.browse(cr, uid, ids):
            f = open(record_browse.file_path)
            result[record_browse.id] = base64.encodestring(f.read())
            f.close()
        return result
    
    _name = 'my.class'

    _columns = {
        'file_path': fields.char('File Location', size=128),
        'file': fields.function(get_file, method=True, store=False, type='binary', string="Download File"),
    }
    
my_class()