Merge the utils and shared apps

shared/views/autocomplete.py

@@ -0,0 +1,45 @@
+from dal import autocomplete
+from django.db.models import Q
+
+
+class ModelSearch:
+    """Basic search engine for models based on filtering.
+
+    Subclasses should override the ``model`` class attribute and specify the list of
+    search fields to be searched in.
+    """
+
+    model = None
+    search_fields = []
+
+    def get_queryset_filter(self, keywords):
+        filter_q = Q()
+
+        if not keywords:
+            return filter_q
+
+        for keyword in keywords:
+            kw_filter = Q()
+            for field in self.search_fields:
+                kw_filter |= Q(**{"{}__icontains".format(field): keyword})
+            filter_q &= kw_filter
+
+        return filter_q
+
+    def search(self, keywords):
+        """Returns the queryset of model instances matching all the keywords.
+
+        The semantic of the search is the following: a model instance appears in the
+        search results iff all of the keywords given as arguments occur in at least one
+        of the search fields.
+        """
+
+        return self.model.objects.filter(self.get_queryset_filter(keywords))
+
+
+class Select2QuerySetView(ModelSearch, autocomplete.Select2QuerySetView):
+    """Compatibility layer between ModelSearch and Select2QuerySetView."""
+
+    def get_queryset(self):
+        keywords = self.q.split()
+        return super().search(keywords)