Fix: Add buttons with error

sale_order.py

@@ -1,6 +1,6 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.model import ModelView, ModelSQL, fields
+from trytond.model import ModelView, ModelSQL, fields, Workflow
 from trytond.pool import Pool
 from trytond.transaction import Transaction
 from trytond.modules.currency.fields import Monetary
@@ -9,7 +9,7 @@ from decimal import Decimal
 from datetime import date
 
 
-class SaleOrder(ModelView, ModelSQL):
+class SaleOrder (Workflow, ModelView, ModelSQL):
     "Sale Order"
     __name__ = 'sale.order'
 
@@ -23,7 +23,7 @@ class SaleOrder(ModelView, ModelSQL):
         [("on_site", "On Site"),
          ("at_home", "At Home")], 'Pickup Location'
     )
-    order_adress = fields.Many2One(
+    order_address = fields.Many2One(
         'party.address', 'Address'
     )
     order_mobile = fields.Function(
@@ -42,6 +42,51 @@ class SaleOrder(ModelView, ModelSQL):
         Monetary("Total", currency='currency', digits='currency'),
         'on_change_with_total_order'
     )
+    number = fields.Char(
+        "Number", readonly=True
+    )
+    state = fields.Selection([
+        ('draft', 'Draft'),
+        ('confirmed', 'Confirmed')], "State"
+    )
+
+    @classmethod
+    def __setup__(cls):
+        super(SaleOrder, cls).__setup__()
+        cls._buttons.update({
+            'confirm': {},
+        })
+        cls._transitions |= set((
+            ('draft', 'confirmed'),
+        ))
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('confirmed')
+    def confirm(cls, orders):
+        for order in orders:
+            if order.number:
+                continue
+            else:
+                cls.set_code([order])
+
+    @classmethod
+    def set_code(cls, orders):
+        for order in orders:
+            order.number = cls.get_number()[0].get()
+            order.save()
+
+    @classmethod
+    def get_number(cls):
+        pool = Pool()
+        Sequence = pool.get('ir.sequence')
+        order_sequence = Sequence.search([(
+            'sequence_type', '=', "sale.order")])
+        return order_sequence
+
+    @staticmethod
+    def default_state():
+        return 'draft'
 
     @staticmethod
     def default_company():

sale_order.xml

@@ -39,6 +39,21 @@ this repository contains the full copyright notices and license terms. -->
       <field name="view" ref="sale_order_view_form"/>
       <field name="act_window" ref="act_sale_order"/>
     </record>
+  
+    <record model="ir.sequence.type" id="sequence_type_order">
+      <field name="name">Order</field>
+    </record>
+    <record model="ir.sequence" id="sequence_sale_order">
+      <field name="name">Sale Order Number Sequence</field>
+      <field name="sequence_type" ref="sequence_type_order"/>
+      <field name="prefix">SO</field>
+      <field name="padding">5</field>
+    </record>
+    <record model="ir.model.button" id="confirm_order_button">
+	    <field name="name">confirm</field>
+	    <field name="string">Confirm</field>
+	    <field name="model" search="[('model', '=', 'sale_order.order')]"/>
+	</record>
     <menuitem
       name="Order"
       action="act_sale_order"

tests/scenario_sale_order.rst

@@ -34,7 +34,6 @@ Create order::
   >>> order = SaleOrder()
   >>> order.party = party
   >>> order.pickup_location = "on_site"
-  >>> order.save()
   >>> line1 = order.lines.new()
   >>> line1.product = product
   >>> line1.unit = unit
@@ -43,6 +42,10 @@ Create order::
   >>> line1.total_amount = Decimal('33600')
   >>> order.total_order = Decimal('33600')
   >>> order.save()
-
-
-  
+  >>> order.state
+  'draft'
+  >>> order.click('confirm')
+  >>> order.state
+  'confirmed'
+  >>> order.number
+  'SO00001'

view/order_form.xml

@@ -4,10 +4,12 @@ this repository contains the full copyright notices and license terms. -->
 <form>
   <label name="party"/>
   <field name="party"/>
+  <label name="number"/>
+  <field name="number"/>
   <label name="pickup_location"/>
   <field name="pickup_location"/>
-  <label name="order_adress"/>
-  <field name="order_adress"/>
+  <label name="order_address"/>
+  <field name="order_address"/>
   <label name="order_mobile"/>
   <field name="order_mobile"/>
   <label name="date"/>