title: How to get current record ID?
body: <p>I have a compute field and function :</p>
  
  <p>When I click on res.partner list view or kanban view, the current record id's data should get calculated and display in smart button, am facing problem in getting the current ID.</p>
  
  <pre class="lang-py prettyprint-override"><code>account_info = fields.Integer(compute='_credit_debit_info', string='# Credits and Debits')
  
  @api.multi
  def _credit_debit_info(self):
      print "...Self...",self.ids
      print "...context..",self.env.context.get('active_id')
      print "...context..", self.env.context
      for partner in self:
          if partner.with_context(active_id=True):
              PartnerInfo = self.env['account.move.line'].with_context(active_test=False).search([('partner_id', '=', partner.id),
                      ('account_id', 'in', (partner.property_account_receivable_id.id, partner.property_account_payable_id.id))])
              for acco in PartnerInfo:
                  cre = sum(acco.mapped('credit'))
                  debit = sum(acco.mapped('debit'))
                  partner.account_info = cre - debit
  </code></pre>