[1.7.x] Renamed DatabaseFeature.supports_check_constraints to supports_column_check_constraints.

Thanks maxi for the suggestion.

Backport of 82c935d44c from master

django/db/backends/__init__.py

@@ -724,7 +724,7 @@ class BaseDatabaseFeatures(object):
     supports_foreign_keys = True
 
     # Does it support CHECK constraints?
-    supports_check_constraints = True
+    supports_column_check_constraints = True
 
     # Does the backend support 'pyformat' style ("... %(name)s ...", {'name': value})
     # parameter passing? Note this can be provided by the backend even if not

django/db/backends/mysql/base.py

@@ -184,7 +184,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     allows_auto_pk_0 = False
     uses_savepoints = True
     atomic_transactions = False
-    supports_check_constraints = False
+    supports_column_check_constraints = False
 
     def __init__(self, connection):
         super(DatabaseFeatures, self).__init__(connection)

django/db/backends/sqlite3/base.py

@@ -103,7 +103,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     has_bulk_insert = True
     can_combine_inserts_with_and_without_auto_increment_pk = False
     supports_foreign_keys = False
-    supports_check_constraints = False
+    supports_column_check_constraints = False
     autocommits_when_autocommit_is_off = True
     can_introspect_decimal_field = False
     can_introspect_positive_integer_field = True

tests/schema/tests.py

@@ -478,7 +478,7 @@ class SchemaTests(TransactionTestCase):
             BookWithM2M._meta.local_many_to_many.remove(new_field)
             del BookWithM2M._meta._m2m_cache
 
-    @unittest.skipUnless(connection.features.supports_check_constraints, "No check constraints")
+    @unittest.skipUnless(connection.features.supports_column_check_constraints, "No check constraints")
     def test_check_constraints(self):
         """
         Tests creating/deleting CHECK constraints