Odoo on write() method check many2many relation - python-2.7

Question

I have 2 classes:
class my_request(models.Model):
_name = 'my.request'
_inherit = ['mail.thread', 'ir.needaction_mixin']
supply_ids = fields.Many2many(comodel_name='supply.conditions',
relation='purchase_supply_rel',
column1='purchase_requests_id', column2='supply_conditions_id',
string='Supply Conditions')
and
class SupplyConditions(models.Model):
_name = 'supply.conditions'
vendor = fields.Char(string='Vendor', required=True)
quantity = fields.Char(string='Quantity', required=True)
request_id = fields.Many2one('my.request', 'My request')
name = fields.Many2one('my.request.line', string='Product', required=True)
currency_id = fields.Many2one('res.currency', string='Currency', default=_get_default_currency)
supply_rel_id = fields.Boolean(string='Relation field', default=False)
my.request class part of form view xml:
<page string="Order">
<field name="supply_ids" domain="[('purchase_id', '=', id)]"/>
</page>
When I select values from my.request form view and click on Save button I call write() method and at that time insert m2m values (if there is selected values) into relational table (purchase_supply_rel).
I want to add check if purchase.request id is in purchase_supply_rel table in purchase_requests_id field when I click on Save button. My function. Changes after # my new code coment:
#api.multi
def write(self, vals):
res = super(PurchaseRequest, self).write(vals)
for request in self:
if request.state != 'draft':
if vals.get('assigned_to'):
self.message_subscribe_users(user_ids=[request.assigned_to.id])
# my new code
test = self.env['purchase.request'].search([(self.id,'in','supply_ids')])
_logger.warning("test " + str(test));
return res
But I got an error:
File "/opt/odoo/openerp/osv/expression.py", line 586, in check_leaf
raise ValueError("Invalid leaf %s" % str(self.leaf))
ValueError: Invalid leaf (348, 'in', 'supply_ids')
How else I can check this? And what I am doing wrong?
UPDATE:
I need to get test value smth like this: purchase_request(245,352)
245,352 - ids of purchase.request class

Answer 1

You can not add dynamic value in domain in place of field name.
Domain is a list of tuples. Domain contains three portions in tuple.
Domain:
[('field_name','operator','values')]
So dynamic value is not allowed in field name in domain.
#api.multi
def write(self, vals):
res = super(PurchaseRequest, self).write(vals)
for request in self:
if request.state != 'draft':
if vals.get('assigned_to'):
self.message_subscribe_users(user_ids=[request.assigned_to.id])
# my new code
test = self.env['purchase.request'].search([('supply_ids','in',self.ids)])
_logger.warning("test " + str(test));
return res