[ADD] add method to open the invoice in tree or form view accordingly.

bzr revid: nco@tinyerp.com-20121102060520-5st9qkxd9p6u5uuy

addons/purchase/purchase.py

@@ -280,6 +280,27 @@ class purchase_order(osv.osv):
         fiscal_position = supplier.property_account_position and supplier.property_account_position.id or False
         return {'value':{'pricelist_id': pricelist, 'fiscal_position': fiscal_position}}
 
+    def invoice_open(self, cr, uid, ids, context=None):
+        mod_obj = self.pool.get('ir.model.data')
+        act_obj = self.pool.get('ir.actions.act_window')
+
+        result = mod_obj.get_object_reference(cr, uid, 'account', 'action_invoice_tree2')
+        id = result and result[1] or False
+        result = act_obj.read(cr, uid, [id], context=context)[0]
+        inv_ids = []
+        for po in self.browse(cr, uid, ids, context=context):
+            inv_ids+= [invoice.id for invoice in po.invoice_ids]
+        if not inv_ids:
+            raise osv.except_osv(_('Error!'), _('Please create Invoices.'))
+         #choose the view_mode accordingly
+        if len(inv_ids)>1:
+            result['domain'] = "[('id','in',["+','.join(map(str, inv_ids))+"])]"
+        else:
+            res = mod_obj.get_object_reference(cr, uid, 'account', 'invoice_supplier_form')
+            result['views'] = [(res and res[1] or False, 'form')]
+            result['res_id'] = inv_ids and inv_ids[0] or False
+        return result
+
     def view_invoice(self, cr, uid, ids, context=None):
         '''
         This function returns an action that display existing invoices of given sale order ids. It can either be a in a list or in a form view, if there is only one invoice to show.

addons/purchase/stock_view.xml

@@ -62,7 +62,7 @@
                         <button type="object"
                             name="view_picking"
                             string="Incoming Shipments" states="approved"/>
-                        <button type="object"  name="view_invoice"
+                        <button type="object"  name="invoice_open"
                             string="Invoices" attrs="{'invisible': [('state', '=', 'draft')]}"/> 
                     </div>
                 </xpath>