add field 'equipment' which contains the relation with 'optical_equipment.equipment'

sale.py

@@ -1,6 +1,8 @@
 from trytond.pool import Pool, PoolMeta
 from trytond.model import ModelView, ModelSQL, fields
 from trytond.pyson import Eval, Bool, If
+from decimal import Decimal
+
 from trytond.transaction import Transaction
 from trytond.exceptions import UserError
 
@@ -47,27 +49,51 @@ class CreateSubscription(Wizard):
 
     @property
     def _subscription_start(self):
-        return dict(
-            start_date = self.start.start_date,
-            end_date = self.start.end_date,
-            invoice_recurrence = self.start.invoice_recurrence,
-            invoice_start_date = self.start.invoice_start_date,
-            service = self.start.service,
-            quantity = self.start.quantity)
+        #raise UserError(str(dir(self)))
+        sale = self.records[0]
+        #raise UserError(str(dir(self.records[0])))
+        return dict(start_date = self.start.start_date,
+                    end_date = self.start.end_date,
+                    invoice_recurrence = self.start.invoice_recurrence,
+                    invoice_start_date = self.start.invoice_start_date,service = self.start.service,
+                    quantity = self.start.quantity,
+                    party=sale.party.id,
+                    contact=sale.contact.id if sale.contact else None,
+                    invoice_party=sale.invoice_party.id if sale.invoice_party else None,
+                    invoice_address=sale.invoice_address.id,
+                    payment_term=sale.payment_term.id if sale.payment_term else None)
     
     def do_create_subscription(self, action):
         pool = Pool()
         Subscription = pool.get('sale.subscription')
+        #SubscriptionLine = pool.get('sale.subscription.line')
+        raise UserError(str(dir(Subscription.lines)))
+        a = self._subscription_start
+        subscription = Subscription(
+            start_date=a['start_date'],
+            end_date=a['end_date'],
+            invoice_recurrence=a['invoice_recurrence'],
+            invoice_start_date=a['invoice_start_date'],
+            party=a['party'],
+            contact=a['contact'],
+            invoice_party=a['contact'],
+            invoice_address=a['invoice_address'],
+            payment_term=a['payment_term'],
+        )
+        subscription.save()
+
+        #raise UserError(str(dir(subscription)))
     
-        #subscription = subscription()
-        self._subscription_start
     
 class SaleLine(metaclass=PoolMeta):
     'SaleLine'
     __name__ = 'sale.line'
 
-    address_equipment = fields.Many2One('party.address', "Direccion")
     product_equipment = fields.Boolean("Product Equipment")
+    equipment = fields.Many2One('optical_equipment.equipment', "Equipment",
+                                domain=[('state', '=', 'registred')],
+                                states={'invisible': If(~Eval('product_equipment'), True)})
+    address_equipment = fields.Many2One('party.address', "Direccion")
     unit_digits = fields.Function(fields.Integer('Unit Digits'),
         'on_change_with_unit_digits')
     
@@ -77,13 +103,35 @@ class SaleLine(metaclass=PoolMeta):
             return self.unit.digits
         return 2
 
+    @fields.depends('equipment', methods=['on_change_product'])
+    def on_change_equipment(self):
+        if self.equipment:
+            self.product = self.equipment.product.id
+            self.on_change_product()        
+        else:
+            self.product = None
+            self.unit= None
+            self.quantity = None
+            self.unit_price = None
+            self.amount = None
+            self.on_change_product()
+
+    @fields.depends('product_equipment', methods=['on_change_equipment'])
+    def on_change_product_equipment(self):
+        if self.product_equipment == False:
+            self.equipment = None
+            #self.on_change_equipment()
+
+            
+
     @fields.depends('product', 'unit', 'quantity', 'sale',
-    '_parent_sale.party',methods=['_get_tax_rule_pattern',
+                    '_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:
             self.product_equipment = False
+            self.unit = None
             return
 
         party = None

view/sale_line_form.xml

@@ -9,8 +9,10 @@
 	</page>
     </xpath>
     <xpath
-        expr="/form/notebook/page[@id='general']/field[@name='product']" position="after">
+        expr="/form/notebook/page[@id='general']/label[@name='product']" position="before">
         <label name="product_equipment"/>
         <field name="product_equipment"/>
+	<label name="equipment"/>
+        <field name="equipment"/>
     </xpath>
 </data>