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modules/sale_invoice_grouping/configuration.py

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+# 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 fields
+from trytond.pool import Pool, PoolMeta
+
+sale_invoice_grouping_method = fields.Selection(
+    'get_sale_invoice_grouping_methods', "Sale Invoice Grouping Method",
+    help="The default invoice grouping method for new customers.")
+
+
+@classmethod
+def get_sale_invoice_grouping_methods(cls):
+    pool = Pool()
+    Party = pool.get('party.party')
+    field_name = 'sale_invoice_grouping_method'
+    return Party.fields_get([field_name])[field_name]['selection']
+
+
+class Configuration(metaclass=PoolMeta):
+    __name__ = 'sale.configuration'
+
+    sale_invoice_grouping_method = fields.MultiValue(
+        sale_invoice_grouping_method)
+    get_sale_invoice_grouping_methods = get_sale_invoice_grouping_methods
+
+    @classmethod
+    def multivalue_model(cls, field):
+        pool = Pool()
+        if field == 'sale_invoice_grouping_method':
+            return pool.get('sale.configuration.sale_method')
+        return super().multivalue_model(field)
+
+
+class ConfigurationSaleMethod(metaclass=PoolMeta):
+    __name__ = 'sale.configuration.sale_method'
+
+    sale_invoice_grouping_method = sale_invoice_grouping_method
+    get_sale_invoice_grouping_methods = get_sale_invoice_grouping_methods