Fixes #19379: allow standalone id in vlan-ids range list (#20024)

* Fixes #19379: allow standalone id in vlan-ids range list

* Misc cleanup

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/utilities/data.py

@@ -160,9 +160,17 @@ def string_to_ranges(value):
         return None
     value.replace(' ', '')  # Remove whitespace
     values = []
-    for dash_range in value.split(','):
-        if '-' not in dash_range:
+    for data in value.split(','):
+        dash_range = data.strip().split('-')
+        if len(dash_range) == 1 and str(dash_range[0]).isdigit():
+            # Single integer value; expand to a range
+            lower = dash_range[0]
+            upper = dash_range[0]
+        elif len(dash_range) == 2 and str(dash_range[0]).isdigit() and str(dash_range[1]).isdigit():
+            # The range has two values and both are valid integers
+            lower = dash_range[0]
+            upper = dash_range[1]
+        else:
             return None
-        lower, upper = dash_range.split('-')
         values.append(NumericRange(int(lower), int(upper), bounds='[]'))
     return values

netbox/utilities/forms/fields/array.py

@@ -32,12 +32,14 @@ class NumericArrayField(SimpleArrayField):
 class NumericRangeArrayField(forms.CharField):
     """
     A field which allows for array of numeric ranges:
-      Example: 1-5,7-20,30-50
+      Example: 1-5,10,20-30
     """
     def __init__(self, *args, help_text='', **kwargs):
         if not help_text:
             help_text = mark_safe(
-                _("Specify one or more numeric ranges separated by commas. Example: " + "<code>1-5,20-30</code>")
+                _(
+                    "Specify one or more individual numbers or numeric ranges separated by commas. Example: {example}"
+                ).format(example="<code>1-5,10,20-30</code>")
             )
         super().__init__(*args, help_text=help_text, **kwargs)
 

netbox/utilities/tests/test_data.py

@@ -66,3 +66,17 @@ class RangeFunctionsTestCase(TestCase):
                 NumericRange(100, 199, bounds='[]'),  # 100-199
             ]
         )
+
+        self.assertEqual(
+            string_to_ranges('1-2, 5, 10-12'),
+            [
+                NumericRange(1, 2, bounds='[]'),    # 1-2
+                NumericRange(5, 5, bounds='[]'),    # 5-5
+                NumericRange(10, 12, bounds='[]'),  # 10-12
+            ]
+        )
+
+        self.assertEqual(
+            string_to_ranges('2-10, a-b'),
+            None  # Fails to convert
+        )