Hai !
I have the following model and manager.
*class StateManager(models.Manager): def get_by_natural_key(self,
name): return self.get(name=name)class State(models.Model): class
Meta: verbose_name = "State" verbose_name_plural =
"States" permissions = ( ('access_state', 'Can access
States'), ) COUNTRIES = ( ('India', 'India'),
('USA', 'USA'), ('Thailand', 'Thailand'), ) # Managers
objects = StateManager() # Database fields name =
models.CharField( 'Name', max_length=100,
unique=True, help_text=''' 100 chars max ''' )
code = models.CharField( 'Code', max_length=10,
unique=True, help_text=''' 10 chars max ''',
null=True, blank=True ) country = models.CharField(
max_length=50, default="India", choices=COUNTRIES,
blank=False, null=False ) def __str__(self): return
self.name def natural_key(self): return self.name*
--------------------------------------------------------------------------------------
My fixture file is given below ....
*[{ "model": "parties.state", "fields": { "name": "Andaman and
Nicobar", "code": "AN", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Andhra
Pradesh", "code": "AP", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Arunachal
Pradesh", "code": "AR", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Assam",
"code": "AS", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Bihar", "code":
"BR", "country": "India" }},{ "model": "parties.state",
"fields": { "name": "Chandigarh", "code": "CH",
"country": "India" }},{ "model": "parties.state", "fields":
{ "name": "Chhattisgarh", "code": "CG", "country":
"India" }},{ "model": "parties.state", "fields": { "name":
"Dadra and Nagar Haveli", "code": "DN", "country": "India"
}},{ "model": "parties.state", "fields": { "name": "Daman and
Diu", "code": "DD", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Delhi", "code":
"DL", "country": "India" }},{ "model": "parties.state",
"fields": { "name": "Goa", "code": "GA", "country":
"India" }},{ "model": "parties.state", "fields": { "name":
"Gujarat", "code": "GJ", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Haryana",
"code": "HR", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Himachal Pradesh",
"code": "HP", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Jammu and Kashmir",
"code": "JK", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Jharkhand", "code":
"JH", "country": "India" }},{ "model": "parties.state",
"fields": { "name": "Karnataka", "code": "KA",
"country": "India" }},{ "model": "parties.state", "fields":
{ "name": "Kerala", "code": "KL", "country":
"India" }},{ "model": "parties.state", "fields": { "name":
"Lakshdweep", "code": "LD", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Madhya
Pradesh", "code": "MP", "country": "India" }},{
"model": "parties.state", "fields": { "name":
"Maharashtra", "code": "MH", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Manipur",
"code": "MN", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Meghalaya", "code":
"ML", "country": "India" }},{ "model": "parties.state",
"fields": { "name": "Mizoram", "code": "MZ",
"country": "India" }},{ "model": "parties.state", "fields":
{ "name": "Nagaland", "code": "NL", "country":
"India" }},{ "model": "parties.state", "fields": { "name":
"Odisha (Orissa)", "code": "OD", "country": "India"
}},{ "model": "parties.state", "fields": { "name": "Puducherry
(Pondicherry)", "code": "PY", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Punjab",
"code": "PB", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Rajasthan", "code":
"RJ", "country": "India" }},{ "model": "parties.state",
"fields": { "name": "Sikkim", "code": "SK", "country":
"India" }},{ "model": "parties.state", "fields": { "name":
"Tamil Nadu", "code": "TN", "country": "India" }},{
"model": "parties.state", "fields": { "name": "Tripura",
"code": "TR", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Uttar Pradesh",
"code": "UP", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Uttarakhand",
"code": "UK", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "West Bengal",
"code": "WB", "country": "India" }},{ "model":
"parties.state", "fields": { "name": "Telangana", "code":
"TL", "country": "India" }}]*
-------------------------------------------------------------------------------------------------------------------
I've earlier dumped the data to a fixture file. But when I am trying to
load the fixture now, I am getting the following error ...
*Traceback (most recent call last): File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/json.py",
line 79, in Deserializer for obj in PythonDeserializer(objects,
**options): File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/python.py",
line 157, in Deserializer obj = base.build_instance(Model, data, db)
File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/base.py",
line 195, in build_instance obj.pk =
Model._default_manager.db_manager(db).get_by_natural_key(*natural_key).pkTypeError:
get_by_natural_key() takes 2 positional arguments but 20 were givenDuring
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
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/__init__.py",
line 354, in execute_from_command_line utility.execute() File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/__init__.py",
line 346, in execute
self.fetch_command(subcommand).run_from_argv(self.argv) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/base.py",
line 394, in run_from_argv self.execute(*args, **cmd_options) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/base.py",
line 445, in execute output = self.handle(*args, **options) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/commands/loaddata.py",
line 60, in handle self.loaddata(fixture_labels) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/commands/loaddata.py",
line 100, in loaddata self.load_label(fixture_label) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/management/commands/loaddata.py",
line 151, in load_label for obj in objects: File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/json.py",
line 85, in Deserializer six.reraise(DeserializationError,
DeserializationError(e), sys.exc_info()[2]) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/utils/six.py",
line 685, in reraise raise value.with_traceback(tb) File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/json.py",
line 79, in Deserializer for obj in PythonDeserializer(objects,
**options): File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/python.py",
line 157, in Deserializer obj = base.build_instance(Model, data, db)
File
"/home/parijath/Projects/virtualenv/django18/lib/python3.4/site-packages/django/core/serializers/base.py",
line 195, in build_instance obj.pk =
Model._default_manager.db_manager(db).get_by_natural_key(*natural_key).pkdjango.core.serializers.base.DeserializationError:
Problem installing fixture
'/home/parijath/Projects/django_projects/webportal18_multipleapps/parties/fixtures/states.json':
get_by_natural_key() takes 2 positional arguments but 20 were
given-------------------------------------------------------------------------*Pl
help.
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