added price field in admin for plats

site_ecole/repas/admin.py

@@ -4,6 +4,7 @@ from django.contrib import admin
 class PlatInline(admin.TabularInline):
     model = Plat
     extra = 1
+    readonly_fields = ['prix_total']
 
 class EvenementAdmin(admin.ModelAdmin):
     fieldsets = (