Improve search logic and allow search of event archive (#248)

* Added search to person, venue, organisation and event archive

* Added search to invoice archive

* Added event search to homepage

* Tidy up event search logic and optimise

* Fixed merge issues

* Stopped 404 on failed search

* Set default ordering of people, organisations & venues to alphabetical (rather than order of addition to database)

* Added invoice search to home page (if you have permissions)

* Made invoice archive sort by reverse invoice date (rather than order added to database)

* Added search help page (very pretty)

* Made single search box for all search types

* FIX: Missing date field breaking archive view

* FEAT: Add omnisearch to header

Tis a bit broken on mobile at the moment...

* CHORE: Conform old code to pep8

* FIX: Select the event form, not the search one in tests!

* Revert "FEAT: Add omnisearch to header"

This reverts commit 6bcb242d6b because it caused MANY more problems than anticipated...

* FIX: Stop 404 on failed search, again

* FEAT: Basic testing of search

* Use a tooltip to help explain the UX

Obviously since it needs a tooltip it isn't brilliant UX but the best I can think of for now...

Co-authored-by: Tom Price <tom@codedinternet.com>
Co-authored-by: David Taylor <david@taylorhq.com>
Co-authored-by: Arona Jones <aj@aronajones.com>

RIGS/finance.py

@@ -11,6 +11,7 @@ from django.template.loader import get_template
 from django.views import generic
 from django.db.models import Q
 from z3c.rml import rml2pdf
+from django.db.models import Q
 
 from RIGS import models
 
@@ -122,6 +123,34 @@ class InvoiceArchive(generic.ListView):
     template_name = 'RIGS/invoice_list_archive.html'
     paginate_by = 25
 
+    def get_queryset(self):
+        q = self.request.GET.get('q', "")
+
+        filter = Q(event__name__icontains=q)
+
+        # try and parse an int
+        try:
+            val = int(q)
+            filter = filter | Q(pk=val)
+            filter = filter | Q(event__pk=val)
+        except:  # noqa
+            # not an integer
+            pass
+
+        try:
+            if q[0] == "N":
+                val = int(q[1:])
+                filter = Q(event__pk=val)  # If string is Nxxxxx then filter by event number
+            elif q[0] == "#":
+                val = int(q[1:])
+                filter = Q(pk=val)  # If string is #xxxxx then filter by invoice number
+        except:  # noqa
+            pass
+
+        object_list = self.model.objects.filter(filter).order_by('-invoice_date')
+
+        return object_list
+
 
 class InvoiceWaiting(generic.ListView):
     model = models.Event