I've posted this question in stackoverflow at http://stackoverflow.com/questions/34636107/error-while-loading-data-from-fixture. The solution was posted by one Alasdair. For reference, his answer is pasted below ...
"
On Wednesday, 6 January 2016 19:59:09 UTC+5:30, Parijatha Kumar Pasupuleti wrote:
-- "
The natural_key method should return a tuple, not a string.
def natural_key(self): return (self.name,)If natural_key is a string "Andaman and Nicobar" instead of a tuple ('Andaman and Nicobar',) then *natural_key will unpack each of the 19 characters in the string as a separate argument. Along with self, that gives you 20 arguments from your error message.
On Wednesday, 6 January 2016 19:59:09 UTC+5:30, Parijatha Kumar Pasupuleti wrote:
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/ Pl help.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).pk
TypeError: get_by_natural_key() takes 2 positional arguments but 20 were given
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 "/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).pk
django.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
------------------------------------------------------------ -------------
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