Filter "Project extent" from location types (#693)

- Fix #598
 - Filter "Project extent" spatial unit type from the location type
   dropdown in the location form.

cadasta/spatial/forms.py

@@ -9,7 +9,7 @@
 from leaflet.forms.widgets import LeafletWidget
 from core.util import ID_FIELD_LENGTH
 from party.models import Party, TenureRelationship, TenureRelationshipType
-from .models import SpatialUnit
+from .models import SpatialUnit, TYPE_CHOICES
 from .widgets import SelectPartyWidget, NewEntityWidget
 
 
@@ -21,6 +21,9 @@ class LocationForm(AttributeModelForm):
                           'provided on the left side of the map to mark your '
                           'new location.')}
     )
+    type = forms.ChoiceField(
+        choices=filter(lambda c: c[0] != 'PX', TYPE_CHOICES)
+    )
     attributes_field = 'attributes'
 
     class Meta:

cadasta/spatial/tests/test_forms.py

@@ -32,6 +32,7 @@ def test_create_location(self):
         form.is_valid()
         form.save()
 
+        assert all([c[0] != 'PX' for c in form.fields['type'].choices])
         assert SpatialUnit.objects.filter(project=project).count() == 1
 
     def test_create_location_with_attributes(self):