Hey David, how are you? Please I need help.
I have been battling with installing psycopg2 on my virtual environment to
i can do migration, but I have not been able to do so because whenever i
tried make migrations, I receive this
Traceback (most recent call last):
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\backends\postgresql\base.py",
line 25, in <module>
import psycopg2 as Database
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\psycopg2\__init__.py", line
51, in <module>
from psycopg2._psycopg import ( # noqa
ModuleNotFoundError: No module named 'psycopg2._psycopg'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\lenovo\miv\ryc\manage.py", line 22, in <module>
main()
File "C:\Users\lenovo\miv\ryc\manage.py", line 18, in main
execute_from_command_line(sys.argv)
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\core\management\__init__.py",
line 401, in execute_from_command_line
utility.execute()
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\core\management\__init__.py",
line 377, in execute
django.setup()
File "C:\Users\lenovo\Envs\easynet\lib\site-packages\django\__init__.py",
line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\apps\registry.py",
line 114, in populate
app_config.import_models()
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\apps\config.py",
line 211, in import_models
self.models_module = import_module(models_module_name)
File
"c:\users\lenovo\appdata\local\programs\python\python39\lib\importlib\__init__.py",
line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 790, in exec_module
File "<frozen importlib._bootstrap>", line 228, in
_call_with_frames_removed
File "C:\Users\lenovo\miv\ryc\food\models.py", line 3, in <module>
class Menu(models.Model):
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\models\base.py",
line 122, in __new__
new_class.add_to_class('_meta', Options(meta, app_label))
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\models\base.py",
line 326, in add_to_class
value.contribute_to_class(cls, name)
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\models\options.py",
line 206, in contribute_to_class
self.db_table = truncate_name(self.db_table,
connection.ops.max_name_length())
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\__init__.py",
line 28, in __getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\utils.py",
line 214, in __getitem__
backend = load_backend(db['ENGINE'])
File "C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\utils.py",
line 111, in load_backend
return import_module('%s.base' % backend_name)
File
"c:\users\lenovo\appdata\local\programs\python\python39\lib\importlib\__init__.py",
line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 790, in exec_module
File "<frozen importlib._bootstrap>", line 228, in
_call_with_frames_removed
File
"C:\Users\lenovo\Envs\easynet\lib\site-packages\django\db\backends\postgresql\base.py",
line 29, in <module>
raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
django.core.exceptions.ImproperlyConfigured: Error loading psycopg2 module:
No module named 'psycopg2._psycopg'
On Saturday, October 17, 2020 at 5:40:05 AM UTC+1 David Nugent wrote:
> Apologies, I must have bumped send accidentally.
>
> To complete the sentence, unless fields have null=True then referencing
> unsaved records here will fail because there is no id in the dependent
> records to provide a reference. By default there is a constraint that the
> reference is not null.
>
> But rather than add null=True to fields, you probably need to ensure those
> model instances are saved and populated with a valid record before saving
> your InputTypeMap record.
>
> It would have little to do with the database, any version. That would be
> the last place I'd go looking for such an issue.
>
> Regards, David
>
> On 17 Oct 2020, at 15:13, David Nugent <dav...@uniquode.io> wrote:
>
> In __your__ code, most certainly. :-)
>
> You didn't say what 'training', 'input_type' and 'gender' are. It is in
> one or more of those where the problem exists.
>
> Do these referenced save module instances? If they are not yet saved then
> it will trigger this error for fields where
>
>
>
> On 13 Oct 2020, at 08:49, Joakim Hove <joaki...@gmail.com> wrote:
>
> Thank you for answering. Just to be sure: you agree that the behavior I
> describe looks like a bug somewhere?
>
>
>
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