Use tryton.cfg to register in the Pool

modules/product/__init__.py

@@ -1,38 +1,18 @@
 # 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.pool import Pool
-
-from . import category, configuration, ir, product, uom
-from .product import (
-    ProductDeactivatableMixin, TemplateDeactivatableMixin, price_digits,
-    round_price)
-from .uom import uom_conversion_digits
-
-__all__ = [price_digits, round_price, uom_conversion_digits,
-    ProductDeactivatableMixin, TemplateDeactivatableMixin]
+__all__ = [
+    'price_digits', 'round_price', 'uom_conversion_digits',
+    'ProductDeactivatableMixin', 'TemplateDeactivatableMixin']
 
 
-def register():
-    Pool.register(
-        ir.Configuration,
-        ir.Cron,
-        uom.UomCategory,
-        uom.Uom,
-        category.Category,
-        product.Template,
-        product.Product,
-        product.ProductIdentifier,
-        product.ProductListPrice,
-        # before ProductCostPrice for migration
-        product.ProductCostPriceMethod,
-        product.ProductCostPrice,
-        product.TemplateCategory,
-        product.TemplateCategoryAll,
-        product.ProductReplaceAsk,
-        configuration.Configuration,
-        configuration.ConfigurationDefaultCostPriceMethod,
-        module='product', type_='model')
-    Pool.register(
-        product.ProductReplace,
-        module='product', type_='wizard')
+def __getattr__(name):
+    if name == 'uom_conversion_digits':
+        from .uom import uom_conversion_digits
+        return uom_conversion_digits
+    elif name in {
+            'price_digits', 'round_price',
+            'ProductDeactivatableMixin', 'TemplateDeactivatableMixin'}:
+        from . import product
+        return getattr(product, name)
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

modules/product/tryton.cfg

@@ -10,3 +10,25 @@ xml:
     uom.xml
     configuration.xml
     message.xml
+
+[register]
+model:
+    ir.Configuration
+    ir.Cron
+    uom.UomCategory
+    uom.Uom
+    category.Category
+    product.Template
+    product.Product
+    product.ProductIdentifier
+    product.ProductListPrice
+    # before ProductCostPrice for migration
+    product.ProductCostPriceMethod
+    product.ProductCostPrice
+    product.TemplateCategory
+    product.TemplateCategoryAll
+    product.ProductReplaceAsk
+    configuration.Configuration
+    configuration.ConfigurationDefaultCostPriceMethod
+wizard:
+    product.ProductReplace