Add option to ignore migrations containing a certain string

README.md

@@ -4,10 +4,11 @@ Detect backward incompatible migrations for your django projects. All in one fil
 
 ## Usage
 
-`python migration_checker.py DJANGO_PROJECT_FOLDER [GIT_COMMIT_ID]`
+`python migration_checker.py DJANGO_PROJECT_FOLDER [GIT_COMMIT_ID] [--ignore-name-contains=IGNORE_NAME_CONTAINS]`
 
 * `DJANGO_PROJECT_FOLDER` - an absolute or relative path to the django project.
 * `GIT_COMMIT_ID` - if specified, only migrations since this commit will be taken into account. If not specified, the initial repo commit will be used.
+* `--ignore-name-contains IGNORE_NAME_CONTAINS`- ignore migrations containing this name
 
 ## Requirements
 
@@ -28,7 +29,6 @@ More test are to be written.
 ## Improvements
 
 * More tests (always!)
-* Possibility to ignore certain migrations
 * Possibility to only check certain apps within the project (and/or exclude certain ones)
 * Detect data migration (not only scheme migrations)
 * Detection dependent on specified database (mysql, postgresql, ...)

migration_checker.py

@@ -21,9 +21,10 @@ class MigrationChecker:
         }
     )
 
-    def __init__(self, django_folder, commit_id=None):
+    def __init__(self, django_folder, commit_id=None, **kwargs):
         self.location = django_folder
         self.commit_id = commit_id
+        self.ignore_name_contains = kwargs.get('ignore_name_contains', None)
         self.changed_migration_files = []
         self._gather_migrations()
 
@@ -51,11 +52,15 @@ class MigrationChecker:
     def check_migrations(self):
         nb_valid = 0
         nb_erroneous = 0
+        nb_ignore = 0
         for migration in self.changed_migration_files:
             app_name, migration_name = self._split_migration_path(migration)
-            sql_statements = self.django_sqlmigrate(app_name, migration_name)
             print('{0}... '.format(migration), end='')
-
+            if self.ignore_name_contains and self.ignore_name_contains in migration_name:
+                print('IGNORE')
+                nb_ignore += 1
+            else:
+                sql_statements = self.django_sqlmigrate(app_name, migration_name)
                 errors = set()
                 for statement in sql_statements:
                     is_valid, err_msg = self._test_sql_statement_for_backward_incompatibility(statement)
@@ -70,7 +75,7 @@ class MigrationChecker:
                     for err in errors:
                         print('\t' + err)
         print('*** Summary:')
-        print('Valid migrations: {0}/{1} - erroneous migrations: {2}/{1}'.format(nb_valid, len(self.changed_migration_files), nb_erroneous))
+        print('Valid migrations: {0}/{1} - erroneous migrations: {2}/{1} - ignored migrations: {3}/{1}'.format(nb_valid, len(self.changed_migration_files), nb_erroneous, nb_ignore))
 
     def _split_migration_path(self, migration_path):
         decomposed_path = split_path(migration_path)
@@ -123,9 +128,10 @@ if __name__ == '__main__':
     parser = argparse.ArgumentParser(description='Detect backward incompatible django migrations.')
     parser.add_argument('django_folder', metavar='DJANGO_FOLDER', type=str, nargs=1, help='the path to the django project')
     parser.add_argument('commit_id', metavar='GIT_COMMIT_ID', type=str, nargs='?', help='if specified, only migrations since this commit will be taken into account. If not specified, the initial repo commit will be used')
+    parser.add_argument('--ignore-name-contains', type=str, nargs='?', help='ignore migrations containing this name')
     args = parser.parse_args()
 
     folder_name = args.django_folder[0]
     if valid_folder(folder_name):
-        checker = MigrationChecker(folder_name, args.commit_id)
+        checker = MigrationChecker(folder_name, args.commit_id, ignore_name_contains=args.ignore_name_contains)
         checker.check_migrations()