Fixes #8317: Fix CSV import of multi-select custom field values

docs/release-notes/version-3.1.md

@@ -16,6 +16,7 @@
 * [#8301](https://github.com/netbox-community/netbox/issues/8301) - Fix delete button for various object children views
 * [#8305](https://github.com/netbox-community/netbox/issues/8305) - Fix assignment of custom field data to FHRP groups via UI
 * [#8306](https://github.com/netbox-community/netbox/issues/8306) - Redirect user to previous page after login
+* [#8317](https://github.com/netbox-community/netbox/issues/8317) - Fix CSV import of multi-select custom field values
 
 ---
 

netbox/extras/models/customfields.py

@@ -16,7 +16,8 @@ from extras.utils import FeatureQuery, extras_features
 from netbox.models import ChangeLoggedModel
 from utilities import filters
 from utilities.forms import (
-    CSVChoiceField, DatePicker, LaxURLField, StaticSelectMultiple, StaticSelect, add_blank_choice,
+    CSVChoiceField, CSVMultipleChoiceField, DatePicker, LaxURLField, StaticSelectMultiple, StaticSelect,
+    add_blank_choice,
 )
 from utilities.querysets import RestrictedQuerySet
 from utilities.validators import validate_regex
@@ -287,7 +288,7 @@ class CustomField(ChangeLoggedModel):
                     choices=choices, required=required, initial=initial, widget=StaticSelect()
                 )
             else:
-                field_class = CSVChoiceField if for_csv_import else forms.MultipleChoiceField
+                field_class = CSVMultipleChoiceField if for_csv_import else forms.MultipleChoiceField
                 field = field_class(
                     choices=choices, required=required, initial=initial, widget=StaticSelectMultiple()
                 )

netbox/extras/tests/test_customfields.py

@@ -122,13 +122,14 @@ class CustomFieldTest(TestCase):
 
     def test_select_field(self):
         obj_type = ContentType.objects.get_for_model(Site)
+        choices = ['Option A', 'Option B', 'Option C']
 
         # Create a custom field
         cf = CustomField(
             type=CustomFieldTypeChoices.TYPE_SELECT,
             name='my_field',
             required=False,
-            choices=['Option A', 'Option B', 'Option C']
+            choices=choices
         )
         cf.save()
         cf.content_types.set([obj_type])
@@ -138,12 +139,47 @@ class CustomFieldTest(TestCase):
         self.assertIsNone(site.custom_field_data[cf.name])
 
         # Assign a value to the first Site
-        site.custom_field_data[cf.name] = 'Option A'
+        site.custom_field_data[cf.name] = choices[0]
         site.save()
 
         # Retrieve the stored value
         site.refresh_from_db()
-        self.assertEqual(site.custom_field_data[cf.name], 'Option A')
+        self.assertEqual(site.custom_field_data[cf.name], choices[0])
+
+        # Delete the stored value
+        site.custom_field_data.pop(cf.name)
+        site.save()
+        site.refresh_from_db()
+        self.assertIsNone(site.custom_field_data.get(cf.name))
+
+        # Delete the custom field
+        cf.delete()
+
+    def test_multiselect_field(self):
+        obj_type = ContentType.objects.get_for_model(Site)
+        choices = ['Option A', 'Option B', 'Option C']
+
+        # Create a custom field
+        cf = CustomField(
+            type=CustomFieldTypeChoices.TYPE_MULTISELECT,
+            name='my_field',
+            required=False,
+            choices=choices
+        )
+        cf.save()
+        cf.content_types.set([obj_type])
+
+        # Check that the field has a null initial value
+        site = Site.objects.first()
+        self.assertIsNone(site.custom_field_data[cf.name])
+
+        # Assign a value to the first Site
+        site.custom_field_data[cf.name] = [choices[0], choices[1]]
+        site.save()
+
+        # Retrieve the stored value
+        site.refresh_from_db()
+        self.assertEqual(site.custom_field_data[cf.name], [choices[0], choices[1]])
 
         # Delete the stored value
         site.custom_field_data.pop(cf.name)
@@ -597,6 +633,9 @@ class CustomFieldImportTest(TestCase):
             CustomField(name='select', type=CustomFieldTypeChoices.TYPE_SELECT, choices=[
                 'Choice A', 'Choice B', 'Choice C',
             ]),
+            CustomField(name='multiselect', type=CustomFieldTypeChoices.TYPE_MULTISELECT, choices=[
+                'Choice A', 'Choice B', 'Choice C',
+            ]),
         )
         for cf in custom_fields:
             cf.save()
@@ -607,19 +646,20 @@ class CustomFieldImportTest(TestCase):
         Import a Site in CSV format, including a value for each CustomField.
         """
         data = (
-            ('name', 'slug', 'status', 'cf_text', 'cf_longtext', 'cf_integer', 'cf_boolean', 'cf_date', 'cf_url', 'cf_json', 'cf_select'),
-            ('Site 1', 'site-1', 'active', 'ABC', 'Foo', '123', 'True', '2020-01-01', 'http://example.com/1', '{"foo": 123}', 'Choice A'),
-            ('Site 2', 'site-2', 'active', 'DEF', 'Bar', '456', 'False', '2020-01-02', 'http://example.com/2', '{"bar": 456}', 'Choice B'),
-            ('Site 3', 'site-3', 'active', '', '', '', '', '', '', '', ''),
+            ('name', 'slug', 'status', 'cf_text', 'cf_longtext', 'cf_integer', 'cf_boolean', 'cf_date', 'cf_url', 'cf_json', 'cf_select', 'cf_multiselect'),
+            ('Site 1', 'site-1', 'active', 'ABC', 'Foo', '123', 'True', '2020-01-01', 'http://example.com/1', '{"foo": 123}', 'Choice A', '"Choice A,Choice B"'),
+            ('Site 2', 'site-2', 'active', 'DEF', 'Bar', '456', 'False', '2020-01-02', 'http://example.com/2', '{"bar": 456}', 'Choice B', '"Choice B,Choice C"'),
+            ('Site 3', 'site-3', 'active', '', '', '', '', '', '', '', '', ''),
         )
         csv_data = '\n'.join(','.join(row) for row in data)
 
         response = self.client.post(reverse('dcim:site_import'), {'csv': csv_data})
         self.assertEqual(response.status_code, 200)
+        self.assertEqual(Site.objects.count(), 3)
 
         # Validate data for site 1
         site1 = Site.objects.get(name='Site 1')
-        self.assertEqual(len(site1.custom_field_data), 8)
+        self.assertEqual(len(site1.custom_field_data), 9)
         self.assertEqual(site1.custom_field_data['text'], 'ABC')
         self.assertEqual(site1.custom_field_data['longtext'], 'Foo')
         self.assertEqual(site1.custom_field_data['integer'], 123)
@@ -628,10 +668,11 @@ class CustomFieldImportTest(TestCase):
         self.assertEqual(site1.custom_field_data['url'], 'http://example.com/1')
         self.assertEqual(site1.custom_field_data['json'], {"foo": 123})
         self.assertEqual(site1.custom_field_data['select'], 'Choice A')
+        self.assertEqual(site1.custom_field_data['multiselect'], ['Choice A', 'Choice B'])
 
         # Validate data for site 2
         site2 = Site.objects.get(name='Site 2')
-        self.assertEqual(len(site2.custom_field_data), 8)
+        self.assertEqual(len(site2.custom_field_data), 9)
         self.assertEqual(site2.custom_field_data['text'], 'DEF')
         self.assertEqual(site2.custom_field_data['longtext'], 'Bar')
         self.assertEqual(site2.custom_field_data['integer'], 456)
@@ -640,6 +681,7 @@ class CustomFieldImportTest(TestCase):
         self.assertEqual(site2.custom_field_data['url'], 'http://example.com/2')
         self.assertEqual(site2.custom_field_data['json'], {"bar": 456})
         self.assertEqual(site2.custom_field_data['select'], 'Choice B')
+        self.assertEqual(site2.custom_field_data['multiselect'], ['Choice B', 'Choice C'])
 
         # No custom field data should be set for site 3
         site3 = Site.objects.get(name='Site 3')

netbox/utilities/forms/fields.py

@@ -31,6 +31,7 @@ __all__ = (
     'CSVDataField',
     'CSVFileField',
     'CSVModelChoiceField',
+    'CSVMultipleChoiceField',
     'CSVMultipleContentTypeField',
     'CSVTypedChoiceField',
     'DynamicModelChoiceField',
@@ -263,10 +264,7 @@ class CSVFileField(forms.FileField):
         return value
 
 
-class CSVChoiceField(forms.ChoiceField):
-    """
-    Invert the provided set of choices to take the human-friendly label as input, and return the database value.
-    """
+class CSVChoicesMixin:
     STATIC_CHOICES = True
 
     def __init__(self, *, choices=(), **kwargs):
@@ -274,6 +272,25 @@ class CSVChoiceField(forms.ChoiceField):
         self.choices = unpack_grouped_choices(choices)
 
 
+class CSVChoiceField(CSVChoicesMixin, forms.ChoiceField):
+    """
+    A CSV field which accepts a single selection value.
+    """
+    pass
+
+
+class CSVMultipleChoiceField(CSVChoicesMixin, forms.MultipleChoiceField):
+    """
+    A CSV field which accepts multiple selection values.
+    """
+    def to_python(self, value):
+        if not value:
+            return []
+        if not isinstance(value, str):
+            raise forms.ValidationError(f"Invalid value for a multiple choice field: {value}")
+        return value.split(',')
+
+
 class CSVTypedChoiceField(forms.TypedChoiceField):
     STATIC_CHOICES = True