refactor: optimize admin queries and add dependent dropdown logic for contract posts in operation templates

loko/interventions/admin.py

@@ -713,25 +713,21 @@ class OperationTemplateAdminForm(forms.ModelForm):
                     ct = ContentType.objects.get_for_model(model)
                     
                     # Filter instances by categories first (most specific), then by thematic
+                    qs = model.objects.select_related('category')
                     if category_ids:
-                        instances = model.objects.filter(
-                            category_id__in=category_ids
-                        ).order_by('code')
+                        instances = qs.filter(category_id__in=category_ids).order_by('code')
                     elif thematic_id:
-                        instances = model.objects.filter(
-                            category__thematic_id=thematic_id
-                        ).order_by('code')
+                        instances = qs.filter(category__thematic_id=thematic_id).order_by('code')
                     else:
-                        instances = model.objects.all().order_by('code')
+                        instances = qs.all().order_by('code')
                     
-                    if instances.exists():
-                        for instance in instances:
-                            # Value format: "content_type_id:object_id"
-                            value = f"{ct.id}:{instance.pk}"
-                            # Display with category info
-                            category_name = instance.category.get_name() if instance.category else ''
-                            display = f"{instance} ({category_name})" if category_name else str(instance)
-                            choices.append((value, display))
+                    for instance in instances:
+                        # Value format: "content_type_id:object_id"
+                        value = f"{ct.id}:{instance.pk}"
+                        # Display with category info
+                        category_name = instance.category.get_name() if instance.category else ''
+                        display = f"{instance} ({category_name})" if category_name else str(instance)
+                        choices.append((value, display))
             except (TypeError, Exception):
                 continue
         
@@ -778,8 +774,33 @@ class OperationTemplateAdminForm(forms.ModelForm):
         js = ('interventions/admin_operation_template_dynamic.js',)
 
 
+class ContractOperationTemplatePostInlineForm(forms.ModelForm):
+    class Meta:
+        model = ContractOperationTemplatePost
+        fields = '__all__'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        from contracts.models import ContractPost
+        contract_id = None
+        if self.instance and self.instance.pk and self.instance.contract_id:
+            contract_id = self.instance.contract_id
+        elif self.data:
+            prefix = self.prefix
+            contract_key = f"{prefix}-contract" if prefix else "contract"
+            contract_id = self.data.get(contract_key)
+
+        if contract_id:
+            self.fields['contract_post'].queryset = ContractPost.objects.filter(
+                contract_id=contract_id
+            ).order_by('order_number')
+        else:
+            self.fields['contract_post'].queryset = ContractPost.objects.none()
+
+
 class OperationTemplateContractPostInline(admin.TabularInline):
     model = ContractOperationTemplatePost
+    form = ContractOperationTemplatePostInlineForm
     extra = 0
     fields = ('contract', 'contract_post', 'default_quantity', 'comment')
     verbose_name = "Poste de contrat par défaut"
@@ -794,6 +815,10 @@ class OperationTemplateContractPostInline(admin.TabularInline):
                     kwargs["queryset"] = Contract.objects.filter(
                         thematics=template.thematic
                     ).distinct().select_related('company').order_by('contract_number')
+                else:
+                    kwargs["queryset"] = Contract.objects.all().select_related('company').order_by('contract_number')
+            else:
+                kwargs["queryset"] = Contract.objects.all().select_related('company').order_by('contract_number')
         return super().formfield_for_foreignkey(db_field, request, **kwargs)
 
 
@@ -818,6 +843,13 @@ class OperationTemplateAdmin(admin.ModelAdmin):
             'description': 'Sélectionnez les modèles d\'équipements spécifiques. Si vide, tous les modèles des catégories sélectionnées seront concernés.',
         }),
     )
+
+    def get_queryset(self, request):
+        return super().get_queryset(request).select_related(
+            'thematic', 'team', 'team__company'
+        ).prefetch_related(
+            'categories', 'asset_model_filters'
+        )
     
     @admin.display(description='Catégories')
     def categories_list(self, obj):
@@ -834,8 +866,31 @@ class OperationTemplateAdmin(admin.ModelAdmin):
         return ', '.join(str(f) for f in filters) + ('...' if obj.asset_model_filters.count() > 3 else '')
 
 
+class ContractOperationTemplatePostAdminForm(forms.ModelForm):
+    class Meta:
+        model = ContractOperationTemplatePost
+        fields = '__all__'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        from contracts.models import ContractPost
+        contract_id = None
+        if self.instance and self.instance.pk and self.instance.contract_id:
+            contract_id = self.instance.contract_id
+        elif self.data and 'contract' in self.data:
+            contract_id = self.data.get('contract')
+
+        if contract_id:
+            self.fields['contract_post'].queryset = ContractPost.objects.filter(
+                contract_id=contract_id
+            ).order_by('order_number')
+        else:
+            self.fields['contract_post'].queryset = ContractPost.objects.none()
+
+
 @admin.register(ContractOperationTemplatePost)
 class ContractOperationTemplatePostAdmin(admin.ModelAdmin):
+    form = ContractOperationTemplatePostAdminForm
     list_display = ('contract', 'operation_template', 'contract_post', 'default_quantity', 'comment')
     list_filter = ('contract', 'operation_template', 'contract__thematics')
     search_fields = (
@@ -850,6 +905,11 @@ class ContractOperationTemplatePostAdmin(admin.ModelAdmin):
     class Media:
         js = ('interventions/admin_operation_template_dynamic.js',)
 
+    def get_queryset(self, request):
+        return super().get_queryset(request).select_related(
+            'contract', 'contract__company', 'operation_template', 'contract_post'
+        )
+
     def formfield_for_foreignkey(self, db_field, request, **kwargs):
         if db_field.name == "contract_post":
             obj_id = request.resolver_match.kwargs.get('object_id') if request.resolver_match else None