Add django 1.11 compatibility

Author: yamijuan

.coveragerc

@@ -0,0 +1,5 @@
+[run]
+source = preview_image_widget
+omit =
+    */tests/*
+    */apps.py

manage.py

@@ -0,0 +1,8 @@
+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == "__main__":
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "preview_image_widget.tests.testsettings")
+    from django.core.management import execute_from_command_line
+    execute_from_command_line(sys.argv)

preview_image_widget/__init__.py

@@ -0,0 +1,7 @@
+from django.apps import AppConfig
+
+
+class MenuAppConfig(AppConfig):
+    name = 'preview_image_widget'
+    label = 'preview_image_widget'
+    verbose_name = 'Preview Image Widget'

preview_image_widget/apps.py

@@ -0,0 +1,42 @@
+#coding: utf-8
+
+import django
+from django.conf import settings
+from django.test import TestCase
+
+from preview_image_widget.widgets import PreviewImageWidget
+from preview_image_widget.tests.utils import render_django110, render_django111
+
+
+class TestSimpleImageWidget(TestCase):
+    def setUp(self):
+        super(TestSimpleImageWidget, self).setUp()
+        self.widget = PreviewImageWidget()
+        self.image = 'static/img/no-user.png'
+        self.preview_url = settings.MEDIA_URL + self.image
+        self.args = {
+            'name': 'image',
+            'value': self.image,
+            'attrs': {
+                'preview_image_widget': 1,
+                'data-preview': self.preview_url
+            }
+        }
+        if django.VERSION >= (1, 11, 0):
+            self.render_method = render_django111
+            self.args.update({
+                'widget': self.widget
+            })
+        else:
+            self.render_method = render_django110
+
+    def tearDown(self):
+        super(TestSimpleImageWidget, self).tearDown()
+        del self.widget
+
+    def test_widget(self):
+        """
+        Tests the widget render
+        """
+        html_expected = self.render_method(**self.args)
+        self.assertEqual(self.widget.render('image', self.image), html_expected)

preview_image_widget/tests/__init__.py

@@ -0,0 +1,13 @@
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': ':memory:',
+    },
+}
+SECRET_KEY = "r4dy"
+
+INSTALLED_APPS = [
+    'preview_image_widget'
+]
+
+MIDDLEWARE_CLASSES = []

preview_image_widget/tests/test_widget.py

@@ -0,0 +1,31 @@
+from django.forms.utils import flatatt
+from django.utils.html import format_html
+from django.utils.safestring import mark_safe
+
+try:
+    from django.forms.renderers import get_default_renderer
+except ImportError:
+    def get_default_renderer():
+        return None
+
+def render_django111(**kwargs):
+    """
+    Renders the widget using the django 1.11+ way
+    :param kwargs: key word arguments with the test data
+    :return: widget rendered
+    """
+    widget = kwargs.pop("widget")
+    renderer = get_default_renderer()
+    context = widget.get_context(kwargs['name'], kwargs['value'], kwargs['attrs'])
+    return mark_safe(renderer.render('django/forms/widgets/input.html', context))
+
+def render_django110(**kwargs):
+    """
+    Renders the widget using the django 1.11+ way
+    :param kwargs: key word arguments with the test data
+    :return: widget rendered
+    """
+    final_attrs = {'type': 'file', 'name': kwargs['name']}
+    final_attrs.update(kwargs['attrs'])
+    html_expected = format_html('<input{} />', flatatt(final_attrs))
+    return html_expected

preview_image_widget/tests/testsettings.py

@@ -21,10 +21,9 @@ def render(self, name, value, attrs=None):
         """
         if value:
             preview = {"data-preview": settings.MEDIA_URL + str(value)}
-            if attrs:
-                attrs.update(preview)
-            else:
-                attrs = preview
+            if not attrs:
+                attrs = {}
+            attrs.update(preview)
         return super(PreviewImageWidget, self).render(name, value, attrs=attrs)
 
     class Media:

preview_image_widget/tests/utils.py

@@ -0,0 +1,2 @@
+django >= 1.9+
+coverage

preview_image_widget/widgets.py

@@ -0,0 +1,54 @@
+[tox]
+skipsdist = True
+envlist =
+    py27-django18,
+    py27-django19,
+    py27-django110,
+    py27-django111,
+    py35-django18,
+    py35-django19,
+    py35-django110,
+    py35-django111
+
+[testenv]
+commands=coverage run --source=preview_image_widget manage.py test
+
+[testenv:py27-django18]
+basepython = python2.7
+deps = Django==1.8.*
+       coverage
+
+[testenv:py27-django19]
+basepython = python2.7
+deps = Django==1.9.*
+       coverage
+
+[testenv:py27-django110]
+basepython = python2.7
+deps = Django==1.10.*
+       coverage
+
+[testenv:py27-django111]
+basepython = python2.7
+deps = Django==1.11.*
+       coverage
+
+[testenv:py35-django18]
+basepython = python3.5
+deps = Django==1.8.*
+       coverage
+
+[testenv:py35-django19]
+basepython = python3.5
+deps = Django==1.9.*
+       coverage
+
+[testenv:py35-django110]
+basepython = python3.5
+deps = Django==1.10.*
+       coverage
+
+[testenv:py35-django111]
+basepython = python3.5
+deps = Django==1.11.*
+       coverage