Drop Django 1.8 and 1.10 support

.travis.yml

@@ -17,8 +17,6 @@ python:
   - "3.6"
 env:
   matrix:
-  - DJANGO=18
-  - DJANGO=110
   - DJANGO=111
   - DJANGO=master
   - TOXENV=qa

CHANGELOG.md

@@ -5,6 +5,8 @@ Changelog Summary
 
 * Drop Python 2 support
 * Drop Python 3.5 support
+* Drop Django 1.8 support
+* Drop Django 1.10 support
 
 ### v5.10.0
 * Add support for dependent select fields [321](github.com/applegrew/django-select2/pull/321/).

django_select2/forms.py

@@ -53,6 +53,7 @@ from django import forms
 from django.core import signing
 from django.db.models import Q
 from django.forms.models import ModelChoiceIterator
+from django.urls import reverse
 from django.utils.encoding import force_text
 from django.utils.six.moves.cPickle import PicklingError as cPicklingError
 from django.utils.translation import get_language
@@ -60,11 +61,6 @@ from django.utils.translation import get_language
 from .cache import cache
 from .conf import settings
 
-try:
-    from django.urls import reverse
-except ImportError:
-    from django.core.urlresolvers import reverse
-
 
 class Select2Mixin(object):
     """
@@ -97,12 +93,6 @@ class Select2Mixin(object):
             self.choices = list(chain([('', '')], self.choices))
         return super(Select2Mixin, self).optgroups(name, value, attrs=attrs)
 
-    def render_options(self, *args, **kwargs):
-        """Render options including an empty one, if the field is not required."""
-        output = '<option value=""></option>' if not self.is_required and not self.allow_multiple_selected else ''
-        output += super(Select2Mixin, self).render_options(*args, **kwargs)
-        return output
-
     def _get_media(self):
         """
         Construct Media as a dynamic property.
@@ -276,22 +266,6 @@ class HeavySelect2Mixin(object):
             msg = "You need to overwrite \"set_to_cache\" or ensure that %s is serialisable."
             raise NotImplementedError(msg % self.__class__.__name__)
 
-    def render_options(self, *args):
-        """Render only selected options."""
-        try:
-            selected_choices, = args
-        except ValueError:  # Signature contained `choices` prior to Django 1.10
-            choices, selected_choices = args
-            choices = chain(self.choices, choices)
-        else:
-            choices = self.choices
-        output = ['<option value=""></option>' if not self.is_required and not self.allow_multiple_selected else '']
-        selected_choices = {force_text(v) for v in selected_choices}
-        choices = [(k, v) for k, v in choices if force_text(k) in selected_choices]
-        for option_value, option_label in choices:
-            output.append(self.render_option(selected_choices, option_value, option_label))
-        return '\n'.join(output)
-
 
 class HeavySelect2Widget(HeavySelect2Mixin, Select2Widget):
     """
@@ -477,30 +451,6 @@ class ModelSelect2Mixin(object):
             subgroup.append(self.create_option(name, option_value, option_label, selected_choices, index))
         return groups
 
-    def render_options(self, *args):
-        """Render only selected options and set QuerySet from :class:`ModelChoiceIterator`."""
-        try:
-            selected_choices, = args
-        except ValueError:
-            choices, selected_choices = args
-            choices = chain(self.choices, choices)
-        else:
-            choices = self.choices
-        selected_choices = {force_text(v) for v in selected_choices}
-        output = ['<option value=""></option>' if not self.is_required and not self.allow_multiple_selected else '']
-        if isinstance(self.choices, ModelChoiceIterator):
-            if self.queryset is None:
-                self.queryset = self.choices.queryset
-            selected_choices = {c for c in selected_choices
-                                if c not in self.choices.field.empty_values}
-            choices = [(obj.pk, self.label_from_instance(obj))
-                       for obj in self.choices.queryset.filter(pk__in=selected_choices)]
-        else:
-            choices = [(k, v) for k, v in choices if force_text(k) in selected_choices]
-        for option_value, option_label in choices:
-            output.append(self.render_option(selected_choices, option_value, option_label))
-        return '\n'.join(output)
-
     def label_from_instance(self, obj):
         """
         Return option label representation from instance.

tox.ini

@@ -1,13 +1,11 @@
 [tox]
-envlist = py{36}-dj{18,110,111,master},qa,docs
+envlist = py{36}-dj{111,master},qa,docs
 [testenv]
 setenv=
     PYTHONPATH = {toxinidir}
 passenv=CI
 deps=
     -rrequirements-dev.txt
-    dj18: https://github.com/django/django/archive/stable/1.8.x.tar.gz#egg=django
-    dj110: https://github.com/django/django/archive/stable/1.10.x.tar.gz#egg=django
     dj111: https://github.com/django/django/archive/stable/1.11.x.tar.gz#egg=django
     djmaster: https://github.com/django/django/archive/master.tar.gz#egg=django
 commands=