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 ...
" The natural_key <https://docs.djangoproject.com/en/dev/topics/serialization/#serialization-of-natural-keys> 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 <http://self.name> def natural_key(self): return > self.name <http://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 <http://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 <http://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. > -- You received this message because you are subscribed to the Google Groups "Django users" group. 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