Add OCR app setting migrations

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -3,6 +3,7 @@
 - Improve setting migration method matching. Avoid executing
   a migrations for settings with similar but shorter names.
 - Fix sources app setting migrations.
+- Add OCR app setting migrations.
 
 3.3.1 (2019-12-04)
 ==================

mayan/apps/ocr/setting_migrations.py

@@ -0,0 +1,15 @@
+from __future__ import unicode_literals
+
+from mayan.apps.common.serialization import yaml_load
+from mayan.apps.smart_settings.classes import NamespaceMigration
+
+
+class OCRSettingMigration(NamespaceMigration):
+    """
+    From version 0001 to 0002 backend arguments are no longer quoted
+    but YAML valid too. Changed in version 3.3.
+    """
+    def ocr_backend_arguments_0001(self, value):
+        return yaml_load(
+            stream=value or '{}',
+        )

mayan/apps/ocr/settings.py

@@ -4,7 +4,12 @@ from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.smart_settings.classes import Namespace
 
-namespace = Namespace(label=_('OCR'), name='ocr')
+from .setting_migrations import OCRSettingMigration
+
+namespace = Namespace(
+    label=_('OCR'), migration_class=OCRSettingMigration, name='ocr',
+    version='0002'
+)
 
 setting_ocr_backend = namespace.add_setting(
     global_name='OCR_BACKEND',

mayan/apps/ocr/tests/test_setting_migrations.py

@@ -0,0 +1,36 @@
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.utils.encoding import force_bytes
+
+from mayan.apps.common.tests.base import BaseTestCase
+from mayan.apps.common.tests.mixins import EnvironmentTestCaseMixin
+from mayan.apps.smart_settings.classes import Setting
+from mayan.apps.storage.utils import NamedTemporaryFile
+
+from ..settings import setting_ocr_backend_arguments
+
+
+class OCRSettingMigrationTestCase(EnvironmentTestCaseMixin, BaseTestCase):
+    def test_ocr_backend_arguments_0001(self):
+
+        test_value = {'location': 'test value'}
+
+        with NamedTemporaryFile() as file_object:
+            settings.CONFIGURATION_FILEPATH = file_object.name
+            file_object.write(
+                force_bytes(
+                    '{}: {}'.format(
+                        'OCR_BACKEND_ARGUMENTS',
+                        '"{}"'.format(
+                            Setting.serialize_value(value=test_value)
+                        )
+                    )
+                )
+            )
+            file_object.seek(0)
+            Setting._config_file_cache = None
+
+            self.assertEqual(
+                setting_ocr_backend_arguments.value, test_value
+            )