[REF] move support for sparse fields into a separate module (#15070)

This removal has led to a necessary refactoring:
- make the setup of field attributes extensible;
- make the instantiation of custom fields extensible;
- delegate model and field reflection to `ir.model` and `ir.model.fields`;
- move the implementation of sparse and serialized fields to module `base_sparse_field`;

2 files changed, 43 insertions, 0 deletions

diff --git a/addons/base_sparse_field/tests/__init__.py b/addons/base_sparse_field/tests/__init__.py
new file mode 100644
index 00000000000..1dc570533d5
--- /dev/null
+++ b/addons/base_sparse_field/tests/__init__.py
@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+
+from . import test_sparse_fields
diff --git a/addons/base_sparse_field/tests/test_sparse_fields.py b/addons/base_sparse_field/tests/test_sparse_fields.py
new file mode 100644
index 00000000000..7c7e8264d34
--- /dev/null
+++ b/addons/base_sparse_field/tests/test_sparse_fields.py
@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+
+from odoo.tests import common
+
+
+class TestSparseFields(common.TransactionCase):
+
+    def test_sparse(self):
+        """ test sparse fields. """
+        record = self.env['sparse_fields.test'].create({})
+        self.assertFalse(record.data)
+
+        partner = self.env.ref('base.main_partner')
+        values = [
+            ('boolean', True),
+            ('integer', 42),
+            ('float', 3.14),
+            ('char', 'John'),
+            ('selection', 'two'),
+            ('partner', partner.id),
+        ]
+        for n, (key, val) in enumerate(values):
+            record.write({key: val})
+            self.assertEqual(record.data, dict(values[:n+1]))
+
+        for key, val in values[:-1]:
+            self.assertEqual(record[key], val)
+        self.assertEqual(record.partner, partner)
+
+        for n, (key, val) in enumerate(values):
+            record.write({key: False})
+            self.assertEqual(record.data, dict(values[n+1:]))
+
+        # check reflection of sparse fields in 'ir.model.fields'
+        names = [name for name, _ in values]
+        domain = [('model', '=', 'sparse_fields.test'), ('name', 'in', names)]
+        fields = self.env['ir.model.fields'].search(domain)
+        self.assertEqual(len(fields), len(names))
+        for field in fields:
+            self.assertEqual(field.serialization_field_id.name, 'data')