Refs #29227 -- Made inspectdb generate BooleanField(null=True) rather than NullBooleanField.

django/core/management/commands/inspectdb.py

@@ -142,11 +142,8 @@ class Command(BaseCommand):
                     # Add 'null' and 'blank', if the 'null_ok' flag was present in the
                     # table description.
                     if row[6]:  # If it's NULL...
-                        if field_type == 'BooleanField(':
-                            field_type = 'NullBooleanField('
-                        else:
-                            extra_params['blank'] = True
-                            extra_params['null'] = True
+                        extra_params['blank'] = True
+                        extra_params['null'] = True
 
                     field_desc = '%s = %s%s' % (
                         att_name,

django/db/backends/base/features.py

@@ -141,6 +141,10 @@ class BaseDatabaseFeatures:
     # Can the backend introspect a TimeField, instead of a DateTimeField?
     can_introspect_time_field = True
 
+    # Some backends may not be able to differentiate BooleanField from other
+    # fields such as IntegerField.
+    introspected_boolean_field_type = 'BooleanField'
+
     # Can the backend introspect the column order (ASC/DESC) for indexes?
     supports_index_column_ordering = True
 
@@ -268,17 +272,3 @@ class BaseDatabaseFeatures:
         except NotSupportedError:
             return False
         return True
-
-    def introspected_boolean_field_type(self, field=None):
-        """
-        What is the type returned when the backend introspects a BooleanField?
-        The `field` argument may be used to give further details of the field
-        to be introspected.
-
-        The return value from this function is compared by tests against actual
-        introspection results; it should provide expectations, not run an
-        introspection itself.
-        """
-        if field and field.null:
-            return 'NullBooleanField'
-        return 'BooleanField'

django/db/backends/mysql/features.py

@@ -18,6 +18,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     can_introspect_binary_field = False
     can_introspect_small_integer_field = True
     can_introspect_positive_integer_field = True
+    introspected_boolean_field_type = 'IntegerField'
     supports_index_column_ordering = False
     supports_timezones = False
     requires_explicit_null_ordering_when_grouping = True
@@ -68,9 +69,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
             cursor.execute("SELECT 1 FROM mysql.time_zone LIMIT 1")
             return cursor.fetchone() is not None
 
-    def introspected_boolean_field_type(self, *args, **kwargs):
-        return 'IntegerField'
-
     @cached_property
     def is_sql_auto_is_null_enabled(self):
         with self.connection.cursor() as cursor:

docs/releases/2.1.txt

@@ -285,6 +285,9 @@ Database backend API
 * ``DatabaseOperations.distinct_sql()`` now requires an additional ``params``
   argument and returns a tuple of SQL and parameters instead of a SQL string.
 
+* ``DatabaseFeatures.introspected_boolean_field_type`` is changed from a method
+  to a property.
+
 :mod:`django.contrib.gis`
 -------------------------
 

tests/inspectdb/tests.py

@@ -7,8 +7,6 @@ from django.db import connection
 from django.db.backends.base.introspection import TableInfo
 from django.test import TestCase, TransactionTestCase, skipUnlessDBFeature
 
-from .models import ColumnTypes
-
 
 def inspectdb_tables_only(table_name):
     """
@@ -96,15 +94,9 @@ class InspectDBTestCase(TestCase):
         else:
             assertFieldType('big_int_field', "models.IntegerField()")
 
-        bool_field = ColumnTypes._meta.get_field('bool_field')
-        bool_field_type = connection.features.introspected_boolean_field_type(bool_field)
+        bool_field_type = connection.features.introspected_boolean_field_type
         assertFieldType('bool_field', "models.{}()".format(bool_field_type))
-        null_bool_field = ColumnTypes._meta.get_field('null_bool_field')
-        null_bool_field_type = connection.features.introspected_boolean_field_type(null_bool_field)
-        if 'BooleanField' in null_bool_field_type:
-            assertFieldType('null_bool_field', "models.{}()".format(null_bool_field_type))
-        else:
-            assertFieldType('null_bool_field', "models.{}(blank=True, null=True)".format(null_bool_field_type))
+        assertFieldType('null_bool_field', 'models.{}(blank=True, null=True)'.format(bool_field_type))
 
         if connection.features.can_introspect_decimal_field:
             assertFieldType('decimal_field', "models.DecimalField(max_digits=6, decimal_places=1)")

tests/schema/tests.py

@@ -476,10 +476,7 @@ class SchemaTests(TransactionTestCase):
         columns = self.column_classes(Author)
         # BooleanField are stored as TINYINT(1) on MySQL.
         field_type = columns['awesome'][0]
-        self.assertEqual(
-            field_type,
-            connection.features.introspected_boolean_field_type(new_field)
-        )
+        self.assertEqual(field_type, connection.features.introspected_boolean_field_type)
 
     def test_add_field_default_transform(self):
         """