Add option to management command to ignore missing file (#191)

README.md

@@ -196,9 +196,12 @@ class AsyncImageModel(models.Model)
 You might want to add new variations to a field. That means you need to render new variations for missing fields.
 This can be accomplished using a management command.
 ```bash
-python manage.py rendervariations 'app_name.model_name.field_name' [--replace]
+python manage.py rendervariations 'app_name.model_name.field_name' [--replace] [-i/--ignore-missing]
 ```
 The `replace` option will replace all existing files.
+The `ignore-missing` option will suspend missing source file errors and keep
+rendering variations for other files. Othervise command will stop on first
+missing file.
 
 ### Multi processing
 Since version 2 stdImage supports multiprocessing.

stdimage/management/commands/rendervariations.py

@@ -24,8 +24,16 @@ def add_arguments(self, parser):
                             default=False,
                             help='Replace existing files.')
 
+        parser.add_argument('-i', '--ignore-missing',
+                            action='store_true',
+                            dest='ignore_missing',
+                            default=False,
+                            help='Ignore missing source file error and '
+                                 'skip render for that file')
+
     def handle(self, *args, **options):
         replace = options.get('replace', False)
+        ignore_missing = options.get('ignore_missing', False)
         routes = options.get('field_path', [])
         for route in routes:
             try:
@@ -48,10 +56,11 @@ def handle(self, *args, **options):
             images = queryset.values_list(field_name, flat=True).iterator()
             count = queryset.count()
 
-            self.render(field, images, count, replace, do_render)
+            self.render(field, images, count, replace, ignore_missing,
+                        do_render)
 
     @staticmethod
-    def render(field, images, count, replace, do_render):
+    def render(field, images, count, replace, ignore_missing, do_render):
         kwargs_list = (
             dict(
                 file_name=file_name,
@@ -60,6 +69,7 @@ def render(field, images, count, replace, do_render):
                 replace=replace,
                 storage=field.storage.deconstruct()[0],
                 field_class=field.attr_class,
+                ignore_missing=ignore_missing,
             )
             for file_name in images
         )
@@ -77,9 +87,16 @@ def render(field, images, count, replace, do_render):
 
 def render_field_variations(kwargs):
     kwargs['storage'] = get_storage_class(kwargs['storage'])()
+    ignore_missing = kwargs.pop('ignore_missing')
     do_render = kwargs.pop('do_render')
-    if callable(do_render):
-        kwargs.pop('field_class')
-        do_render = do_render(**kwargs)
-    if do_render:
-        render_variations(**kwargs)
+    try:
+        if callable(do_render):
+            kwargs.pop('field_class')
+            do_render = do_render(**kwargs)
+        if do_render:
+            render_variations(**kwargs)
+    except FileNotFoundError as e:
+        if not ignore_missing:
+            raise CommandError(
+                 'Source file was not found, terminating. '
+                 'Use -i/--ignore-missing to skip this error.') from e

tests/test_commands.py

@@ -83,6 +83,48 @@ def test_replace(self, image_upload_file):
         after = os.path.getmtime(file_path)
         assert before != after
 
+    def test_ignore_missing(self, image_upload_file):
+        obj = ThumbnailModel.objects.create(image=image_upload_file)
+        file_path = obj.image.path
+        assert os.path.exists(file_path)
+        os.remove(file_path)
+        assert not os.path.exists(file_path)
+        time.sleep(1)
+        call_command(
+            'rendervariations',
+            'tests.ThumbnailModel.image',
+            '--ignore-missing',
+            replace=True,
+        )
+
+    def test_short_ignore_missing(self, image_upload_file):
+        obj = ThumbnailModel.objects.create(image=image_upload_file)
+        file_path = obj.image.path
+        assert os.path.exists(file_path)
+        os.remove(file_path)
+        assert not os.path.exists(file_path)
+        time.sleep(1)
+        call_command(
+            'rendervariations',
+            'tests.ThumbnailModel.image',
+            '-i',
+            replace=True,
+        )
+
+    def test_no_ignore_missing(self, image_upload_file):
+        obj = ThumbnailModel.objects.create(image=image_upload_file)
+        file_path = obj.image.path
+        assert os.path.exists(file_path)
+        os.remove(file_path)
+        assert not os.path.exists(file_path)
+        time.sleep(1)
+        with pytest.raises(CommandError):
+            call_command(
+                'rendervariations',
+                'tests.ThumbnailModel.image',
+                replace=True,
+            )
+
     def test_none_default_storage(self, image_upload_file):
         obj = MyStorageModel.customer_manager.create(
             image=image_upload_file