add filters

aircox/admin/filters.py

@@ -0,0 +1,32 @@
+from django.contrib.admin import filters
+from django.utils.translation import gettext_lazy as _
+
+
+__all__ = ('DateFieldFilter',)
+
+
+class DateFieldFilter(filters.FieldListFilter):
+    template = 'admin/aircox/filters/date_filter.html'
+    input_type = 'date'
+
+    def __init__(self, field, request, params, model, model_admin, field_path):
+        self.field_generic = '%s__' % field_path
+        self.date_params = {k: v for k, v in params.items()
+                                if k.startswith(self.field_generic)}
+
+        self.links = ((_('Exact'), self.field_generic + 'exact'),
+                      (_('Since'), self.field_generic + 'gte'),
+                      (_('Until'), self.field_generic + 'lte'))
+        super().__init__(field, request, params, model, model_admin, field_path)
+
+    def expected_parameters(self):
+        return [link[1] for link in self.links]
+
+    def choices(self, changelist):
+        for link in self.links:
+            yield {'label': link[0],
+                   'name': link[1],
+                   'value': self.date_params.get(link[1]),
+                   'type': self.input_type,}
+
+