[FIX] web: one2many: field in list and not in form

Have a one2many that defines a list arch.
The list should not be editable, precisely, when adding a record, it should go through
a form view.

Define a standard form view in DB, not in the main arch, that doesn't have
at least one of the field that the list arch has.

Create a record in the one2many list, change a field in order to trigger an onchange.

Before this commit, there was a crash, because the onchange asked for the field present in the list
and the ones present in the form, but there was a description (the result of fields_get) only
for the fields present in the form.

After this commit, this is solved.

closes odoo/odoo#109749

closes odoo/odoo#110410

X-original-commit: c6897e1e1e5bcf3378bddeb58393baa7426b64c7
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/views/fields/relational_utils.js

@@ -558,7 +558,10 @@ async function getFormViewInfo({ list, activeField, viewService, userService, en
             views: [[false, "form"]],
         });
         const archInfo = new FormArchParser().parse(views.form.arch, relatedModels, comodel);
-        formViewInfo = { ...archInfo, fields }; // should be good to memorize this on activeField
+        // Fields that need to be defined are the ones in the form view, this is natural,
+        // plus the ones that the list record has, that is, present in either the list arch or the kanban arch
+        // of the one2many field
+        formViewInfo = { ...archInfo, fields: { ...list.fields, ...fields } }; // should be good to memorize this on activeField
     }
 
     await loadSubViews(

addons/web/static/tests/views/fields/one2many_field_tests.js

@@ -12500,4 +12500,57 @@ QUnit.module("Fields", (hooks) => {
         assert.hasAttrValue(target.querySelector(".o_dialog .o_form_button_save_new"), "disabled", undefined);
         assert.hasAttrValue(target.querySelector(".o_dialog .o_form_button_cancel"), "disabled", undefined);
     });
+
+    QUnit.test("field in list but not in fetched form", async function (assert) {
+        serverData.models.partner.fields.o2m = {
+            type: "one2many",
+            relation: "partner_type",
+            relation_field: "p_id",
+        };
+        serverData.models.partner_type.onchanges = {
+            display_name: (rec) => {
+                if (rec.display_name === "changed") {
+                    rec.color = 5;
+                }
+            },
+        };
+
+        serverData.models.partner_type.fields.p_id = { type: "many2one", relation: "partner" };
+        serverData.views = {
+            "partner_type,false,form": `<form><field name="display_name" /></form>`,
+        };
+
+        await makeView({
+            type: "form",
+            resModel: "partner",
+            serverData,
+            arch: `
+                <form>
+                    <field name="o2m">
+                        <tree>
+                            <field name="display_name"/>
+                            <field name="color" />
+                        </tree>
+                    </field>
+                </form>`,
+            mockRPC(route, args) {
+                assert.step(`${args.method}: ${args.model}`);
+            },
+        });
+
+        assert.verifySteps(["get_views: partner", "onchange: partner"]);
+        await click(target, ".o_field_x2many_list_row_add a");
+        assert.verifySteps(["get_views: partner_type", "onchange: partner_type"]);
+        await editInput(
+            target.querySelector(".modal"),
+            ".o_field_widget[name='display_name'] input",
+            "changed"
+        );
+        assert.verifySteps(["onchange: partner_type"]);
+        await click(target.querySelector(".modal .o_form_button_save"));
+        assert.strictEqual(target.querySelector(".o_data_row").textContent, "changed5");
+        await click(target, ".o_form_button_save");
+        assert.verifySteps(["create: partner", "read: partner", "read: partner_type"]);
+        assert.strictEqual(target.querySelector(".o_data_row").textContent, "changed5");
+    });
 });