Add coordinates autocomplete widget & data (#32)

Just tweaks based on what Carl had already written in dce53630 and b97d421a

apps/map/views.py

@@ -1,13 +1,17 @@
-from django.core.mail import send_mail
 from django.conf import settings
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.core.mail import send_mail
+from django.db.models import Q
+from django.http import Http404, HttpResponse
+from django.urls import reverse
 from django.views import View
 from django.views.generic import DetailView
 from django.views.generic.base import TemplateView
 from django.views.generic.edit import CreateView
-from django.http import Http404, HttpResponse
-from django.contrib.auth.mixins import LoginRequiredMixin
-from django.urls import reverse
-from .models import CaseStudy, CaseStudyDraft
+
+from dal import autocomplete
+
+from .models import CaseStudy, CaseStudyDraft, SpatialRefSys
 from .forms import ShortCaseStudyForm, LongCaseStudyForm
 
 
@@ -83,6 +87,19 @@ class CaseStudyDetail(DetailView):
     context_object_name = "case_study"
 
 
+class SpatialRefSysAutocomplete(autocomplete.Select2QuerySetView):
+    def get_queryset(self):
+        qs = SpatialRefSys.objects.all()
+
+        if self.q:
+            qs = qs.filter(
+                Q(auth_name__icontains=self.q)
+                | Q(auth_srid__icontains=self.q)
+            )
+
+        return qs
+
+
 class Drafts(View):
     """Retrieve or save a draft."""