Charger des projecteurs Django avec des champs de clé étrangère NULL

Question

J'ai créé un ensemble d'appareils avec deux champs de clé étrangère nullables, mais pour une raison quelconque, lorsque j'essaie loaddata, je reçois des plaintes selon lesquelles les champs doivent être des entiers.

modèle (supprimé certaines choses par souci de concision):

class Network(models.Model): 
    network  = models.GenericIPAddressField() 
    mask  = models.CharField(max_length=2) 
    description = models.CharField(max_length=2000) 
    designation = models.CharField(choices=DESIGNATION_CHOICES, max_length=10) 
    site  = models.CharField(choices=SITE_CHOICES, max_length=5) 
    category = models.CharField(choices=CATEGORY_CHOICES, max_length=10) 
    vlan  = models.CharField(max_length=5, blank=True, null=True) 
    vrf   = models.ForeignKey(Vrf,on_delete=models.CASCADE, blank=True, null=True) 
    parent  = models.ForeignKey('self', on_delete=models.CASCADE, related_name='supernet', blank=True, null=True) 

bloc de fixation:

<django-objects version="1.0"> 
    <object model="ipmanager.network" pk="459124212"> 
     <field name="mask" type="CharField">30</field> 
     <field name="site" type="CharField">place</field> 
     <field name="network" type="CharField">1.1.1.1</field> 
     <field name="category" type="CharField">category</field> 
     <field name="description" type="CharField">enum amun set ra</field> 
     <field name="vlan" type="CharField" /> 
     <field name="designation" type="CharField">supernet</field> 
     <field name="parent" rel="ManyToOneRel" to="networks.id"></field> 
     <field name="vrf" rel="ManyToOneRel" to="vrfs.id"></field> 
    </object> 

J'ai essayé Null, Aucun, chaîne vide, et un espace et django n'acceptera n'importe lequel d'entre eux. Voici l'erreur que je reçois:

>python manage.py loaddata ipmanager/net 
works_fixture.xml 
Traceback (most recent call last): 
    File "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\db\models\fields\__init__.py", line 955, in to_python 
    return int(value) 
ValueError: invalid literal for int() with base 10: '' 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File     "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\__init__.py", line 353, in  execute_from_command_ 
line 
    utility.execute() 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\__init__.py", line 345, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\base.py", line 348, in run_from_argv 
    self.execute(*args, **cmd_options) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\base.py", line 399, in execute 
    output = self.handle(*args, **options) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\commands\loaddata.py", line 60, in handle 
    self.loaddata(fixture_labels) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\commands\loaddata.py", line 100, in loaddata 
    self.load_label(fixture_label) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\management\commands\loaddata.py", line 152, in load_label 
    for obj in objects: 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\serializers\xml_serializer.py", line 177, in __next__ 
    return self._handle_object(node) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\serializers\xml_serializer.py", line 218, in  _handle_object 

    data[field.attname] = self._handle_fk_field_node(field_node, field) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\core\serializers\xml_serializer.py", line 258, in _han dle_fk_fie 
ld_node 
    return  model._meta.get_field(field.remote_field.field_name).to_python(field_ 
value) 
    File  "C:\Users\dchadwell.CORP\AppData\Local\Programs\Python\Python35\lib\site- 
packages\django\db\models\fields\__init__.py", line 960, in to_python 
    params={'value': value}, 
django.core.exceptions.ValidationError: ["'' value must be an integer."] 

Qu'est-ce que je fais mal ici?

Answer 1

Retirez les clés étrangères que vous n'avez pas besoin, plutôt que d'essayer de trouver la valeur vide, à savoir votre bloc de fixation devrait ressembler à ceci:

<django-objects version="1.0"> 
    <object model="ipmanager.network" pk="459124212"> 
     <field name="mask" type="CharField">30</field> 
     <field name="site" type="CharField">place</field> 
     <field name="network" type="CharField">1.1.1.1</field> 
     <field name="category" type="CharField">category</field> 
     <field name="description" type="CharField">enum amun set ra</field> 
     <field name="vlan" type="CharField" /> 
     <field name="designation" type="CharField">supernet</field> 
    </object>