esale product by shop field

tutorial.py

@@ -2,7 +2,8 @@
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
 from trytond.model import ModelSQL, ModelView, fields
-from trytond.pool import PoolMeta
+from trytond.pool import Pool, PoolMeta
+from trytond.transaction import Transaction
 
 __all__ = ['GalateaTutorialProductTemplate', 'GalateaTutorial']
 __metaclass__ = PoolMeta
@@ -22,3 +23,28 @@ class GalateaTutorial:
     __name__ = 'galatea.tutorial'
     products = fields.Many2Many('galatea.tutorial-product.template',
             'tutorial', 'template', 'Product Templates')
+    esale_products_by_shop = fields.Function(fields.Many2Many(
+        'product.template', None, None, 'Products by Shop'),
+        'get_esale_products_by_shop')
+
+    def get_esale_products_by_shop(self, name):
+        '''Get all products by shop
+        (context or user shop preferences)'''
+        templates = [] # ids
+        if not self.products:
+            return templates
+
+        pool = Pool()
+        transaction = Transaction()
+
+        shop = None
+        if Transaction().context.get('shop'):
+            SaleShop = pool.get('sale.shop')
+            shop = SaleShop(transaction.context.get('shop'))
+        if not shop:
+            return templates
+
+        for template in self.products:
+            if shop in template.esale_saleshops:
+                templates.append(template.id)
+        return templates