I'm trying to make a module to manage travel leaves for employees.

What I need to do is adding extra float field in hr.employee module of 'available_tickets' . To be allocated from other module named "travel_request". How to do this? Here's my code:

class travel_request(osv.osv):

    _name = 'travel.request'

    _columns = {

        'no_tickets': fields.float('Number of Tickets'),

     }

class hr_employee(osv.osv):
_inherit="hr.employee"


def _get_tickets(self, cr, uid, ids, field_name, args, context=None):
    res = {}
    tickets_obj = self.pool.get('travel.request')
    tickets_ids = self.pool.get('travel.request').search(cr, uid, [('user_id', '=', uid), ('state', '=', 'validate')])
    for t_id in tickets_ids :
        emp_ticket = tickets_obj.browse(cr, uid, t_id, context=context)

    res['available_tickets'] = emp_ticket.no_tickets
    return res    


_columns = {
    'available_tickets': fields.function(_get_tickets, string='Available Tickets', type="float", store=True),

}

I tried also this method:

def _get_tickets(self, cr, uid, ids, field_name, args, context=None):
    res = {}
    tickets_obj = self.pool.get('travel.request')
    for record in self.browse(cr, uid, ids, context=None):
        tickets_ids = tickets_obj.search(cr, uid, [('user_id', '=', uid), ('state', '=', 'validate')], ids, context=None)
        emp_ticket = tickets_obj.browse(cr, uid, tickets_ids[0], context=None )
        res['available_tickets'] = emp_ticket.no_tickets        
    return res 

But nothing happened, I don't know what is wrong.. can anyone help me to fix it

Here's the error I got:

2016-02-16 13:29:14,549 27608 ERROR test2_travel openerp.http: Exception during JSON request handling.

Traceback (most recent call last):

File "/opt/odoo8/odoo/openerp/http.py", line 537, in _handle_exception

return super(JsonRequest, self)._handle_exception(exception)

File "/opt/odoo8/odoo/openerp/http.py", line 574, in dispatch

result = self._call_function(**self.params)

File "/opt/odoo8/odoo/openerp/http.py", line 310, in _call_function

return checked_call(self.db, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/service/model.py", line 118, in wrapper

return f(dbname, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/http.py", line 307, in checked_call

return self.endpoint(*a, **kw)

File "/opt/odoo8/odoo/openerp/http.py", line 803, in __call__

return self.method(*args, **kw)

File "/opt/odoo8/odoo/openerp/http.py", line 403, in response_wrap

response = f(*args, **kw)

File "/opt/odoo8/odoo/addons/web/controllers/main.py", line 944, in call_kw

return self._call_kw(model, method, args, kwargs)

File "/opt/odoo8/odoo/addons/web/controllers/main.py", line 936, in _call_kw

return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/addons/hr_holidays/hr_holidays.py", line 494, in create

return super(hr_employee, self).create(cr, uid, vals, context=context)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/addons/hr/hr.py", line 285, in create

employee_id = super(hr_employee, self).create(cr, uid, data, context=context)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/addons/mail/mail_thread.py", line 381, in create

thread_id = super(mail_thread, self).create(cr, uid, values, context=context)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/api.py", line 372, in old_api

result = method(recs, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/models.py", line 4094, in create

record = self.browse(self._create(old_vals))

File "/opt/odoo8/odoo/openerp/api.py", line 266, in wrapper

return new_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/api.py", line 508, in new_api

result = method(self._model, cr, uid, *args, **old_kwargs)

File "/opt/odoo8/odoo/openerp/models.py", line 4279, in _create

result += self._columns[field].set(cr, self, id_new, field, vals[field], user, rel_context) or []

File "/opt/odoo8/odoo/openerp/osv/fields.py", line 1486, in set

self._fnct_inv(obj, cr, user, id, name, value, self._fnct_inv_arg, context)

File "/opt/odoo8/odoo/addons/hr/hr.py", line 186, in _set_image

return self.write(cr, uid, [id], {'image': tools.image_resize_image_big(value)}, context=context)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/addons/mail/mail_thread.py", line 432, in write

result = super(mail_thread, self).write(cr, uid, ids, values, context=context)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/api.py", line 399, in old_api

result = method(recs, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/models.py", line 3789, in write

self._write(old_vals)

File "/opt/odoo8/odoo/openerp/api.py", line 266, in wrapper

return new_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/api.py", line 592, in new_api

result = method(self._model, cr, uid, self.ids, *args, **old_kwargs)

File "/opt/odoo8/odoo/openerp/models.py", line 4037, in _write

cr, user, todo, fields_to_recompute, context)

File "/opt/odoo8/odoo/openerp/api.py", line 268, in wrapper

return old_api(self, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/models.py", line 4453, in _store_set_values

cr.execute(query, (column._symbol_set[1](value), id))

File "/opt/odoo8/odoo/openerp/sql_db.py", line 158, in wrapper

return f(self, *args, **kwargs)

File "/opt/odoo8/odoo/openerp/sql_db.py", line 234, in execute

res = self._obj.execute(query, params)

DataError: invalid input syntax for integer: "available_tickets"

LINE 1: ...ployee" SET "available_tickets"='5.00' WHERE id = 'available...