pattern_import_export: fix o2m purge option

pattern_import_export/demo/demo.xml

@@ -35,6 +35,15 @@
             <field name="name">Partner with contact</field>
             <field name="resource">res.partner</field>
         </record>
+        <record id="demo_export_currency" model="ir.exports">
+            <field name="name">Currency</field>
+            <field name="resource">res.currency</field>
+        </record>
+        <record id="demo_export_currency_rate" model="ir.exports">
+            <field name="name">Currency Rate</field>
+            <field name="resource">res.currency.rate</field>
+        </record>
+
         <record id="demo_pattern_config" model="pattern.config">
             <field name="export_id" ref="pattern_import_export.demo_export" />
         </record>
@@ -44,6 +53,15 @@
         <record id="demo_pattern_config_o2m" model="pattern.config">
             <field name="export_id" ref="pattern_import_export.demo_export_o2m" />
         </record>
+        <record id="demo_pattern_config_currency" model="pattern.config">
+            <field name="export_id" ref="pattern_import_export.demo_export_currency" />
+        </record>
+        <record id="demo_pattern_config_currency_rate" model="pattern.config">
+            <field
+                name="export_id"
+                ref="pattern_import_export.demo_export_currency_rate"
+            />
+        </record>
 
         <!--Export lines-->
         <record id="demo_export_line_1" model="ir.exports.line">
@@ -104,5 +122,23 @@
             <field name="tab_filter_id" ref="demo_filter_countries_1" />
             <field name="add_select_tab" eval="True" />
         </record>
+        <record id="demo_export_currency_rate_ids" model="ir.exports.line">
+            <field name="name">rate_ids</field>
+            <field name="export_id" ref="demo_export_currency" />
+            <field name="number_occurence">3</field>
+            <field
+                name="sub_pattern_config_id"
+                ref="demo_pattern_config_currency_rate"
+            />
+        </record>
+        <record id="demo_export_currency_rate_name" model="ir.exports.line">
+            <field name="name">name</field>
+            <field name="export_id" ref="demo_export_currency_rate" />
+        </record>
+        <record id="demo_export_currency_rate_rate" model="ir.exports.line">
+            <field name="name">rate</field>
+            <field name="export_id" ref="demo_export_currency_rate" />
+        </record>
+
     </data>
 </odoo>

pattern_import_export/models/__init__.py

@@ -8,3 +8,4 @@
 from . import pattern_file
 from . import pattern_chunk
 from . import ir_attachment
+from . import fields

pattern_import_export/models/fields.py

@@ -0,0 +1,22 @@
+# Copyright 2023 Akretion (https://www.akretion.com).
+# @author Sébastien BEAU <[email protected]>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+
+from odoo import fields
+
+ori_write_real = fields.One2many.write_real
+
+
+def write_real(self, records_commands_list, create=False):
+    if not create:
+        for recs, commands in records_commands_list:
+            if recs.env.context.get("pattern_config", {}).get("purge_one2many"):
+                update_ids = [cmd[1] for cmd in commands if cmd[0] == 1]
+                for item in recs[self.name]:
+                    if item.id not in update_ids:
+                        commands.append((3, item.id, 0))
+    return ori_write_real(self, records_commands_list, create=create)
+
+
+fields.One2many.write_real = write_real

pattern_import_export/models/ir_fields.py

@@ -155,7 +155,4 @@ def _str_to_one2many(self, model, field, records):
             # raising an error with the split
             # see original method called by super
             records[0][".id"] = str(records[0][".id"])
-        commands, warnings = super()._str_to_one2many(model, field, records)
-        if self._context.get("pattern_config", {}).get("purge_one2many"):
-            commands.insert(0, (5, 0, 0))
-        return commands, warnings
+        return super()._str_to_one2many(model, field, records)

pattern_import_export/tests/test_pattern_import.py

@@ -14,6 +14,10 @@ def setUpClass(cls):
         super().setUpClass()
         cls.pattern_config_m2m.export_format = "json"
         cls.pattern_config.export_format = "json"
+        cls.pattern_config_currency = cls.env.ref(
+            "pattern_import_export.demo_pattern_config_currency"
+        )
+        cls.pattern_config_currency.export_format = "json"
 
     def run_pattern_file(self, pattern_file):
         model = self.env[pattern_file.pattern_config_id.model_id.model].with_context(
@@ -331,7 +335,7 @@ def test_o2m_with_empty_value(self):
         self.assertEqual(partners[0].name, unique_name)
         self.assertEqual(partners[0].child_ids, partners[1])
 
-    def _helper_o2m_update(self):
+    def _case_o2m_update_no_delete_cascade(self):
         unique_name = str(uuid4())
         partner = self.env["res.partner"].create(
             {
@@ -359,20 +363,54 @@ def _helper_o2m_update(self):
         self.assertPatternDone(pattern_file)
         return partner, child_1, child_2
 
-    def test_o2m_update_with_purge(self):
+    def _case_o2m_update_with_delete_cascade(self):
+        currency = self.env.ref("base.EUR")
+        currency.write(
+            {
+                "rate_ids": [
+                    (5, 0, 0),
+                    (0, 0, {"name": "1999-12-02", "rate": 1}),
+                    (0, 0, {"name": "2000-01-30", "rate": 2}),
+                ]
+            }
+        )
+        data = [
+            {
+                ".id": currency.id,
+                "rate_ids|1|name#key": "1999-12-02",
+                "rate_ids|1|rate": 1.5,
+                "rate_ids|2|name#key": "2022-01-01",
+                "rate_ids|2|rate": 3,
+            }
+        ]
+        pattern_file = self.create_pattern(self.pattern_config_currency, "import", data)
+        self.run_pattern_file(pattern_file)
+        self.assertPatternDone(pattern_file)
+        return currency
+
+    def test_o2m_update_with_purge_no_delete_cascade(self):
         self.pattern_config.purge_one2many = True
-        partner, child_1, child_2 = self._helper_o2m_update()
+        partner, child_1, child_2 = self._case_o2m_update_no_delete_cascade()
         self.assertEqual(len(partner.child_ids), 3)
         self.assertIn(child_1, partner.child_ids)
         self.assertNotIn(child_2, partner.child_ids)
 
     def test_o2m_update_without_purge(self):
         self.pattern_config.purge_one2many = False
-        partner, child_1, child_2 = self._helper_o2m_update()
+        partner, child_1, child_2 = self._case_o2m_update_no_delete_cascade()
         self.assertEqual(len(partner.child_ids), 4)
         self.assertIn(child_1, partner.child_ids)
         self.assertIn(child_2, partner.child_ids)
 
+    def test_o2m_update_with_purge_with_delete_cascade(self):
+        self.pattern_config_currency.purge_one2many = True
+        currency = self._case_o2m_update_with_delete_cascade()
+        self.assertEqual(len(currency.rate_ids), 2)
+
+    def test_o2m_update_without_purge_with_delete_cascade(self):
+        currency = self._case_o2m_update_with_delete_cascade()
+        self.assertEqual(len(currency.rate_ids), 3)
+
     def test_empty_m2m_with_o2m(self):
         unique_name = str(uuid4())
         partner2_name = str(uuid4())