Merge pull request #48 from fevral13/master

Fix for IgnoreMigration operation for Postgresql

django_migration_linter/operations.py

@@ -1,36 +1,36 @@
-# Copyright 2019 3YOURMIND GmbH
-
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-
-# http://www.apache.org/licenses/LICENSE-2.0
-
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from django.db.migrations.operations.base import Operation
-
-IGNORE_MIGRATION_SQL = "-- dml ignores this migration"
-
-
-class IgnoreMigration(Operation):
-
-    reversible = True
-    # Must be true to be generated through the sqlmigrate command
-    reduces_to_sql = True
-
-    def state_forwards(self, app_label, state):
-        pass
-
-    def database_forwards(self, app_label, schema_editor, from_state, to_state):
-        schema_editor.execute(IGNORE_MIGRATION_SQL)
-
-    def database_backwards(self, app_label, schema_editor, from_state, to_state):
-        schema_editor.execute(IGNORE_MIGRATION_SQL + "(reversed)")
-
-    def describe(self):
-        return "The Django migration linter will ignore this migration"
+# Copyright 2019 3YOURMIND GmbH
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from django.db.migrations.operations.base import Operation
+
+IGNORE_MIGRATION_SQL = "select 1; -- dml ignores this migration"
+
+
+class IgnoreMigration(Operation):
+
+    reversible = True
+    # Must be true to be generated through the sqlmigrate command
+    reduces_to_sql = True
+
+    def state_forwards(self, app_label, state):
+        pass
+
+    def database_forwards(self, app_label, schema_editor, from_state, to_state):
+        schema_editor.execute(IGNORE_MIGRATION_SQL)
+
+    def database_backwards(self, app_label, schema_editor, from_state, to_state):
+        schema_editor.execute(IGNORE_MIGRATION_SQL + "(reversed)")
+
+    def describe(self):
+        return "The Django migration linter will ignore this migration"