Save some horizontal space in items admin listing

hardware_provisioning/admin.py

@@ -59,7 +59,8 @@ class AvailabilityFilter(admin.SimpleListFilter):
 class LoanHistoryInline(admin.TabularInline):
     model = Loan
     extra = 0
-    readonly_fields = ('user', 'item', 'loan_date', 'loan_date_end', 'notes')
+    fields = ('user', 'item', 'short_date', 'short_date_end', 'notes')
+    readonly_fields = ('user', 'item', 'short_date', 'short_date_end', 'notes')
     ordering = ['-loan_date_end']
     verbose_name_plural = "Historique de prêt de cet objet"
     show_change_link = True

hardware_provisioning/models.py

@@ -165,6 +165,17 @@ class Loan(models.Model):
 
     get_mac_and_serial.short_description = "Adresse MAC / n° de série"
 
+    def short_date(self):
+        return '{:%d/%m/%y}'.format(self.loan_date)
+    short_date.short_description = "Emprunté le…"
+
+    def short_date_end(self):
+        if self.loan_date_end:
+            return '{:%d/%m/%y}'.format(self.loan_date_end)
+        else:
+            return None
+    short_date_end.short_description = "Rendu le…"
+
     def user_can_close(self, user):
         return (not self.item.is_available()) and (self.user == user)