Fixed #21079 -- Further normalized table names in inspectdb

Thanks Michael Manfre for the report and Tim Graham for the review.

django/core/management/commands/inspectdb.py

@@ -32,7 +32,7 @@ class Command(BaseCommand):
         # 'table_name_filter' is a stealth option
         table_name_filter = options.get('table_name_filter')
 
-        table2model = lambda table_name: table_name.title().replace('_', '').replace(' ', '').replace('-', '')
+        table2model = lambda table_name: re.sub(r'[^a-zA-Z0-9]', '', table_name.title())
         strip_prefix = lambda s: s[1:] if s.startswith("u'") else s
 
         with connection.cursor() as cursor:

tests/inspectdb/models.py

@@ -30,7 +30,7 @@ class DigitsInColumnName(models.Model):
     leading_digits = models.CharField(max_length=11, db_column='45extra')
 
 
-class SpecialColumnName(models.Model):
+class SpecialName(models.Model):
     field = models.IntegerField(db_column='field')
     # Underscores
     field_field_0 = models.IntegerField(db_column='Field_')
@@ -40,6 +40,9 @@ class SpecialColumnName(models.Model):
     prc_x = models.IntegerField(db_column='prc(%) x')
     non_ascii = models.IntegerField(db_column='tamaño')
 
+    class Meta:
+        db_table = "inspectdb_special.table name"
+
 
 class ColumnTypes(models.Model):
     id = models.AutoField(primary_key=True)

tests/inspectdb/tests.py

@@ -179,7 +179,9 @@ class InspectDBTestCase(TestCase):
         unsuitable for Python identifiers
         """
         out = StringIO()
-        call_command('inspectdb', stdout=out)
+        call_command('inspectdb',
+                     table_name_filter=lambda tn: tn.startswith('inspectdb_'),
+                     stdout=out)
         output = out.getvalue()
         base_name = 'Field' if not connection.features.uppercases_column_names else 'field'
         self.assertIn("field = models.IntegerField()", output)
@@ -193,6 +195,18 @@ class InspectDBTestCase(TestCase):
         else:
             self.assertIn("tama_o = models.IntegerField(db_column='tama\\xf1o')", output)
 
+    def test_table_name_introspection(self):
+        """
+        Introspection of table names containing special characters,
+        unsuitable for Python identifiers
+        """
+        out = StringIO()
+        call_command('inspectdb',
+                     table_name_filter=lambda tn: tn.startswith('inspectdb_'),
+                     stdout=out)
+        output = out.getvalue()
+        self.assertIn("class InspectdbSpecialTableName(models.Model):", output)
+
     def test_managed_models(self):
         """Test that by default the command generates models with `Meta.managed = False` (#14305)"""
         out = StringIO()