initial model for wizard 'create_subscription'

__init__.py

@@ -16,3 +16,7 @@ def register():
         subscription.Subscription,
         subscription.SubscriptionEquipment,
         module='optical_equipment', type_='model')
+    Pool.register(
+        sale.CreateSubscriptionStart,
+        sale.CreateSubscription,
+        module='sale', type_='wizard')

equipment.py

@@ -130,5 +130,3 @@ class OpticalEquipment(Workflow, ModelSQL, ModelView):
     @Workflow.transition('registred')
     def registred(cls, equipments):
         cls.set_code(equipments)
-
-        

sale.py

@@ -3,6 +3,30 @@ from trytond.model import ModelView, ModelSQL, fields
 from trytond.pyson import Eval, Bool, If
 from trytond.transaction import Transaction
 
+from trytond.wizard import (
+    Button, StateAction, StateTransition, StateView, Wizard)
+
+class CreateSubscriptionStart(ModelView):
+    'Create Subscription Start'
+    __name__ = 'sale.sale.subscription.start'
+
+    start_date = fields.Date("Start Date", required=True)
+    end_date = fields.Date("End Date", required=True)
+    invoice_recurrence = fields.Many2One('sale.subscription.recurrence.rule.set', "Invoice Recurrence",
+                                         required=True)
+    invoice_start_date = fields.Date("Invoice Start Date",
+                                     help='Billing start date')
+
+class CreateSubscription(Wizard):
+    'Create Subscription'
+    __name__ = 'sale.sale.subscription'
+
+    start = StateView('sale.sale.subscription.start',
+                      'sale.create_subscription_view_form',[
+                          Button('Cancel', 'cancel', 'tryton-cancel'),
+                          Button('Create', 'create', 'tryton-ok', default=True),
+                      ])
+
     
     
 class SaleLine(metaclass=PoolMeta):
@@ -21,9 +45,8 @@ class SaleLine(metaclass=PoolMeta):
         return 2
     
     @fields.depends('product', 'unit', 'quantity', 'sale',
-    '_parent_sale.party',
-    methods=['_get_tax_rule_pattern', '_get_context_sale_price',
-    'on_change_with_amount'])
+    '_parent_sale.party',methods=['_get_tax_rule_pattern',
+    '_get_context_sale_price','on_change_with_amount'])
     def on_change_product(self):
         Product = Pool().get('product.product')
         if not self.product:

sale.xml

@@ -6,4 +6,19 @@
 	<field name="inherit" ref="sale.sale_line_view_form"/>
 	<field name="name">sale_line_form</field>
     </record>
+    <record model="ir.ui.view" id="create_subscription_view_form">
+	<field name="model">sale.sale.subscription.start</field>
+	<field name="type">form</field>
+	<field name="name">create_subscription_form</field>
+    </record>
+    <record model="ir.action.wizard" id="create_subscription">
+	<field name="name">Subscription</field>
+        <field name="wiz_name">sale.sale.subscription</field>
+        <field name="model">sale.sale</field>
+    </record>
+    <record model="ir.action.keyword" id="create_subscription_keyword">
+	<field name="keyword">form_action</field>
+        <field name="model">sale.sale,-1</field>
+        <field name="action" ref="create_subscription"/>
+    </record>
 </tryton>

subscription.py

@@ -10,7 +10,7 @@ class Subscription(metaclass=PoolMeta):
     equipments = fields.Many2Many('sale.subscription-optical_equipment.equipment', 'subscription',
                                   'equipment', "Equipments")
         
-    """@classmethod
+    @classmethod
     @ModelView.button
     @Workflow.transition('running')
     @set_employee('run_by')
@@ -21,39 +21,14 @@ class Subscription(metaclass=PoolMeta):
         lines = []
         subscription = subscriptions[0]
         
-        for unit in subscription.equipments:
-                   unit.propietary=subscription.party,
-                   unit.propietary_address=subscription.invoice_address,
-                   unit.mark_category=unit.mark_category,
-                   unit.model_category=unit.model_category
-                   unit.save()
-                   
-        for subscription in subscriptions:
-            if not subscription.next_invoice_date:
-                subscription.next_invoice_date = (
-                    subscription.compute_next_invoice_date())
-            for line in subscription.lines:
-                if (line.next_consumption_date is None
-                        and not line.consumed_until):
-                    line.next_consumption_date = (
-                        line.compute_next_consumption_date())
-            lines.extend(subscription.lines)
-        Line.save(lines)
-        cls.save(subscriptions)"""
-
-    """
-    @classmethod
-    def __setup__(cls):
-        super(Subscription, cls).__setup__()
-        cls._order = [
-            ('end_date', 'DESC'),
-            ('id', 'DESC'),
-            ]
-    """
-        
 class SubscriptionEquipment(ModelSQL):
     'Optical Equipment - Subscription'
     __name__ = 'sale.subscription-optical_equipment.equipment'
     
     subscription = fields.Many2One('sale.subscription', 'Subscription', select=True)
     equipment = fields.Many2One('optical_equipment.equipment', 'Equipment', select=True)
+
+
+class Line(metaclass=PoolMeta):
+    __name__ = 'sale.subscriptioin.line'
+