Fewer requests on participant admin create and updateviews.

- Fewer requests on choicesreventes and tabular inlines (of
  attributions)
- User and tirage cannot be updated if updating a participant instance.
- Tabular inlines are fixed:
  - the one which is used for spectacles with listing only propose
    choices in spectacle with listing
  - same with the other (spectacles without listing)
- Still does too much request (because of tabularinlines)

bda/admin.py

@@ -13,32 +13,85 @@ from bda.models import Spectacle, Salle, Participant, ChoixSpectacle,\
     Attribution, Tirage, Quote, CategorieSpectacle, SpectacleRevente
 
 
+class ReadOnlyMixin(object):
+    readonly_fields_update = ()
+
+    def get_readonly_fields(self, request, obj=None):
+        readonly_fields = super().get_readonly_fields(request, obj)
+        if obj is None:
+            return readonly_fields
+        else:
+            return readonly_fields + self.readonly_fields_update
+
+
 class ChoixSpectacleInline(admin.TabularInline):
     model = ChoixSpectacle
     sortable_field_name = "priority"
 
 
-class AttributionInline(admin.TabularInline):
-    model = Attribution
-    extra = 0
+class AttributionAdminForm(forms.ModelForm):
 
-    def get_queryset(self, request):
-        qs = super(AttributionInline, self).get_queryset(request)
-        return qs.filter(spectacle__listing=False)
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['spectacle'].queryset = (
+            Spectacle.objects
+            .select_related('location')
+        )
+
+
+class AttributionNoListingAdminForm(AttributionAdminForm):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['spectacle'].queryset = (
+            self.fields['spectacle'].queryset
+            .filter(listing=False)
+        )
+
+
+class AttributionListingAdminForm(AttributionAdminForm):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['spectacle'].queryset = (
+            self.fields['spectacle'].queryset
+            .filter(listing=True)
+        )
 
 
 class AttributionInlineListing(admin.TabularInline):
     model = Attribution
-    exclude = ('given', )
     extra = 0
+    form = AttributionListingAdminForm
 
     def get_queryset(self, request):
-        qs = super(AttributionInlineListing, self).get_queryset(request)
+        qs = super().get_queryset(request)
         return qs.filter(spectacle__listing=True)
 
 
-class ParticipantAdmin(admin.ModelAdmin):
-    inlines = [AttributionInline, AttributionInlineListing]
+class AttributionInlineNoListing(admin.TabularInline):
+    model = Attribution
+    exclude = ('given', )
+    extra = 0
+    form = AttributionNoListingAdminForm
+
+    def get_queryset(self, request):
+        qs = super().get_queryset(request)
+        return qs.filter(spectacle__listing=False)
+
+
+class ParticipantAdminForm(forms.ModelForm):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['choicesrevente'].queryset = (
+            Spectacle.objects
+            .select_related('location')
+        )
+
+
+class ParticipantAdmin(ReadOnlyMixin, admin.ModelAdmin):
+    inlines = [AttributionInlineListing, AttributionInlineNoListing]
 
     def get_queryset(self, request):
         return Participant.objects.annotate(nb_places=Count('attributions'),
@@ -65,6 +118,8 @@ class ParticipantAdmin(admin.ModelAdmin):
     actions_on_bottom = True
     list_per_page = 400
     readonly_fields = ("total",)
+    readonly_fields_update = ('user', 'tirage')
+    form = ParticipantAdminForm
 
     def send_attribs(self, request, queryset):
         datatuple = []
@@ -120,17 +175,6 @@ class AttributionAdminForm(forms.ModelForm):
         return cleaned_data
 
 
-class ReadOnlyMixin(object):
-    readonly_fields_update = ()
-
-    def get_readonly_fields(self, request, obj=None):
-        readonly_fields = super().get_readonly_fields(request, obj)
-        if obj is None:
-            return readonly_fields
-        else:
-            return readonly_fields + self.readonly_fields_update
-
-
 class AttributionAdmin(ReadOnlyMixin, admin.ModelAdmin):
     def paid(self, obj):
         return obj.participant.paid