Improve the cache

React to Comments and add a Test

django_migration_linter/cache.py

@@ -33,18 +33,15 @@ class Cache(dict):
 
     def load(self):
         try:
-            f = open(self.filename, 'rb')
+            with open(self.filename, 'rb') as f:
-            tmp_dict = pickle.load(f)
+                tmp_dict = pickle.load(f)
-            self.update(tmp_dict)
+                self.update(tmp_dict)
-            f.close()
         except IOError:
             pass
 
     def save(self):
-        print(self)
+        with open(self.filename, 'wb') as f:
-        f = open(self.filename, 'wb')
+            pickle.dump(self, f, protocol=pickle.HIGHEST_PROTOCOL)
-        pickle.dump(self, f, 2)
-        f.close()
 
     def md5(self, app_name, migration):
         path = compose_migration_path(self.django_folder, app_name, migration)

django_migration_linter/migration_linter.py

@@ -91,7 +91,6 @@ class MigrationLinter(object):
 
         if self.should_ignore_migration(app_name, migration_name):
             print('IGNORE')
-            self.new_cache[md5hash] = {'result': 'IGNORE'}
             self.nb_ignored += 1
             return
 

tests/functional/test_cache.py

@@ -65,7 +65,7 @@ class CacheTest(unittest.TestCase):
         # Start the Linter again -> should use cache now.
         linter = MigrationLinter(fixtures.ADD_NOT_NULL_COLUMN_PROJECT)
 
-        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql)as sql_mock:
+        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql) as sql_mock:
             linter.lint_all_migrations()
             sql_mock.assert_not_called()
 
@@ -77,7 +77,7 @@ class CacheTest(unittest.TestCase):
             os.remove(cache_file)
         linter = MigrationLinter(fixtures.IGNORE_MIGRATION_PROJECT)
 
-        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql)as sql_mock:
+        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql) as sql_mock:
             linter.lint_all_migrations()
             sql_mock.assert_called()
 
@@ -93,10 +93,30 @@ class CacheTest(unittest.TestCase):
         # Start the Linter again -> should use cache now.
         linter = MigrationLinter(fixtures.IGNORE_MIGRATION_PROJECT)
 
-        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql)as sql_mock:
+        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql) as sql_mock:
             linter.lint_all_migrations()
             sql_mock.assert_not_called()
 
+    def test_cache_ignored_command_line(self):
+        cache_file = os.path.join(DEFAULT_CACHE_PATH, 'test_project_ignore_migration.pickle')
+        if os.path.exists(cache_file):
+            os.remove(cache_file)
+        linter = MigrationLinter(fixtures.IGNORE_MIGRATION_PROJECT,
+                                 ignore_name_contains='0001')
+
+        with mock.patch.object(MigrationLinter, 'get_sql', wraps=linter.get_sql) as sql_mock:
+            linter.lint_all_migrations()
+            sql_mock.assert_called()
+
+        cache = Cache(
+            fixtures.IGNORE_MIGRATION_PROJECT,
+            DEFAULT_CACHE_PATH
+        )
+        cache.load()
+
+        self.assertNotIn('63230606af0eccaef7f1f78c537c624c', cache)
+        self.assertEqual(cache['5c5ca1780a9f28439c1defc1f32af894']['result'], 'IGNORE')
+
     def test_cache_modified(self):
         cache_file = os.path.join(DEFAULT_CACHE_PATH, 'test_project_alter_column.pickle')
         if os.path.exists(cache_file):

tests/functional/test_cmd_line_call.py

@@ -172,7 +172,6 @@ class CallLinterFromCommandLineTest(unittest.TestCase):
 
     def test_call_linter_cmd_line_no_cache(self):
         cache_file = os.path.join(DEFAULT_CACHE_PATH, 'test_correct_project.pickle')
-        print(cache_file)
         if os.path.exists(cache_file):
             os.remove(cache_file)