Intermittent IndexError with MySQL and Django running on Ubuntu - mysql

Here is what I'm getting:
Traceback (most recent call last):
File "/.../.env/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/.../.env/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/.../.env/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/.../.env/lib/python3.6/site-packages/django/contrib/auth/decorators.py", line 20, in _wrapped_view
if test_func(request.user):
File "/.../.env/lib/python3.6/site-packages/django/contrib/auth/decorators.py", line 44, in <lambda>
lambda u: u.is_authenticated,
File "/.../.env/lib/python3.6/site-packages/django/utils/functional.py", line 213, in inner
self._setup()
File "/.../.env/lib/python3.6/site-packages/django/utils/functional.py", line 347, in _setup
self._wrapped = self._setupfunc()
File "/.../.env/lib/python3.6/site-packages/django/contrib/auth/middleware.py", line 24, in <lambda>
request.user = SimpleLazyObject(lambda: get_user(request))
File "/.../.env/lib/python3.6/site-packages/django/contrib/auth/middleware.py", line 12, in get_user
request._cached_user = auth.get_user(request)
File "/.../.env/lib/python3.6/site-packages/django/contrib/auth/__init__.py", line 189, in get_user
user = backend.get_user(user_id)
File "/.../.env/lib/python3.6/site-packages/django/contrib/auth/backends.py", line 98, in get_user
user = UserModel._default_manager.get(pk=user_id)
File "/.../.env/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/.../.env/lib/python3.6/site-packages/django/db/models/query.py", line 393, in get
num = len(clone)
File "/.../.env/lib/python3.6/site-packages/django/db/models/query.py", line 250, in __len__
self._fetch_all()
File "/.../.env/lib/python3.6/site-packages/django/db/models/query.py", line 1186, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/.../.env/lib/python3.6/site-packages/django/db/models/query.py", line 63, in __iter__
for row in compiler.results_iter(results):
File "/.../.env/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1007, in apply_converters
value = row[pos]
IndexError: list index out of range
As you can see, there is none of my code in the stacktrace, all I know is that this code is happening somewhere in a very simple view that gets a queryset and renders it to JSON.
Most of the times it works, sometimes this traceback is thrown and the page 500s.
What the hell is going on?
Sometimes I get other weird errors:
unsupported operand type(s) for +=: 'int' and 'str'
triggered by
count += Model.objects.filter(...).count()
I've tried to replicate from a shell, but that's not working.

Related

TypeError: Object of type QuerySet is not JSON serializable in Django

I am not able to tell what item I touched inmy code. There is this traceback for an error. May somebody help me find the problem and how to solve it.
Traceback (most recent call last):
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\utils\deprecation.py", line 119, in __call__
response = self.process_response(request, response)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\sessions\middleware.py", line 61, in process_response
request.session.save()
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\sessions\backends\db.py", line 83, in save
obj = self.create_model_instance(data)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\sessions\backends\db.py", line 70, in create_model_instance
session_data=self.encode(data),
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\contrib\sessions\backends\base.py", line 114, in encode
return signing.dumps(
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\signing.py", line 110, in dumps
return TimestampSigner(key, salt=salt).sign_object(obj, serializer=serializer, compress=compress)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\signing.py", line 172, in sign_object
data = serializer().dumps(obj)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\signing.py", line 87, in dumps
return json.dumps(obj, separators=(',', ':')).encode('latin-1')
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\json\__init__.py", line 234, in dumps
return cls(
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\json\encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\json\encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "C:\Users\Ptar\AppData\Local\Programs\Python\Python39\lib\json\encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type QuerySet is not JSON serializable

How do I fix a TypeError: Object of type bytes is not JSON serializable that is only manifesting inside Docker container?

I am trying to use connexion/Flask to return a base64-encoded image generated by PIL/pillow in a HTTP Response.
Having upgraded to python3.7 from python2.7, that part of the code works unaltered.
However, when running inside Docker (python3.7-slim), I get the time-honoured TypeError: Object of type bytes is not JSON serializable (full Traceback below).
The encoding is undertaken via
cutout_b64 = base64.b64encode(sbuffer.getvalue()).decode("ascii")
PLEASE NOTE: There are many many many answers that suggest applying .decode(...) but this does not work inside Docker! The question is:
Q. Why does this work outside Docker but not inside the container? How do I fix this? Is it a LANG difference perhaps?
Thanks as ever
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.7/site-packages/connexion/decorators/decorator.py", line 68, in wrapper
response = function(request)
File "/usr/local/lib/python3.7/site-packages/connexion/decorators/uri_parsing.py", line 149, in wrapper
response = function(request)
File "/app/custom_validators.py", line 107, in wrapper
response = function(request)
File "/usr/local/lib/python3.7/site-packages/connexion/decorators/response.py", line 110, in wrapper
return _wrapper(request, response)
File "/usr/local/lib/python3.7/site-packages/connexion/decorators/response.py", line 90, in _wrapper
self.operation.api.get_connexion_response(response, self.mimetype)
File "/usr/local/lib/python3.7/site-packages/connexion/apis/abstract.py", line 365, in get_connexion_response
response = cls._response_from_handler(response, mimetype)
File "/usr/local/lib/python3.7/site-packages/connexion/apis/abstract.py", line 345, in _response_from_handler
return cls._build_response(mimetype=mimetype, data=response, extra_context=extra_context)
File "/usr/local/lib/python3.7/site-packages/connexion/apis/flask_api.py", line 186, in _build_response
data, status_code, serialized_mimetype = cls._prepare_body_and_status_code(data=data, mimetype=mimetype, status_code=status_code, extra_context=extra_context)
File "/usr/local/lib/python3.7/site-packages/connexion/apis/abstract.py", line 417, in _prepare_body_and_status_code
body, mimetype = cls._serialize_data(data, mimetype)
File "/usr/local/lib/python3.7/site-packages/connexion/apis/flask_api.py", line 203, in _serialize_data
body = cls.jsonifier.dumps(data)
File "/usr/local/lib/python3.7/site-packages/connexion/jsonifier.py", line 57, in dumps
return self.json.dumps(data, **kwargs) + '\n'
File "/usr/local/lib/python3.7/site-packages/flask/json/__init__.py", line 211, in dumps
rv = _json.dumps(obj, **kwargs)
File "/usr/local/lib/python3.7/json/__init__.py", line 238, in dumps
**kw).encode(obj)
File "/usr/local/lib/python3.7/json/encoder.py", line 201, in encode
chunks = list(chunks)
File "/usr/local/lib/python3.7/json/encoder.py", line 431, in _iterencode
yield from _iterencode_dict(o, _current_indent_level)
File "/usr/local/lib/python3.7/json/encoder.py", line 405, in _iterencode_dict
yield from chunks
File "/usr/local/lib/python3.7/json/encoder.py", line 405, in _iterencode_dict
yield from chunks
File "/usr/local/lib/python3.7/json/encoder.py", line 405, in _iterencode_dict
yield from chunks
File "/usr/local/lib/python3.7/json/encoder.py", line 438, in _iterencode
o = _default(o)
File "/usr/local/lib/python3.7/site-packages/connexion/apps/flask_app.py", line 146, in default
return json.JSONEncoder.default(self, o)
File "/usr/local/lib/python3.7/site-packages/flask/json/__init__.py", line 100, in default
return _json.JSONEncoder.default(self, o)
File "/usr/local/lib/python3.7/json/encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type bytes is not JSON serializable

'ner_ontonotes_bert_mult' model Custom train

When I want to train this 'ner_ontonotes_bert_mult' model with my custom dataset it is showing the error below. (I have saved my datset in the ~\.deeppavlov\downloads\ontonotes folder that was mentioned in [deeppavlov documentation][1]. )
PS C:\Users\sghanta\Desktop\NER> & c:/Users/sghanta/Desktop/NER/env/Scripts/Activate.ps1
(env) PS C:\Users\sghanta\Desktop\NER> & c:/Users/sghanta/Desktop/NER/env/Scripts/python.exe c:/Users/sghanta/Desktop/NER/train_model.py
C:\Users\sghanta\Desktop\NER\env\lib\site-packages\numpy\_distributor_init.py:32: UserWarning: loaded more than 1 DLL from .libs:
C:\Users\sghanta\Desktop\NER\env\lib\site-packages\numpy\.libs\libopenblas.PYQHXLVVQ7VESDPUVUADXEVJOBGHJPAY.gfortran-win_amd64.dll
C:\Users\sghanta\Desktop\NER\env\lib\site-packages\numpy\.libs\libopenblas.WCDJNK7YVMPZQ2ME2ZZHJJRJ3JIKNDB7.gfortran-win_amd64.dll
stacklevel=1)
Traceback (most recent call last):
File "c:/Users/sghanta/Desktop/NER/train_model.py", line 12, in <module>
ner_model = train_model(configs.ner.ner_ontonotes_bert_mult)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\__init__.py", line 29, in train_model
train_evaluate_model_from_config(config, download=download, recursive=recursive)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\commands\train.py", line 92, in train_evaluate_model_from_config
data = read_data_by_config(config)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\commands\train.py", line 58, in read_data_by_config
return reader.read(data_path, **reader_config)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\dataset_readers\conll2003_reader.py", line 56, in read
dataset[name] = self.parse_ner_file(file_name)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\dataset_readers\conll2003_reader.py", line 106, in parse_ner_file
raise Exception(f"Input is not valid {line}")
Exception: Input is not valid
O
(env) PS C:\Users\sghanta\Desktop\NER>
After cleaning the dataset the above error has gone but this is the new error.
New Error
2021-08-12 02:43:35.335 ERROR in 'deeppavlov.core.common.params'['params'] at line 112: Exception in <class 'deeppavlov.models.bert.bert_sequence_tagger.BertSequenceTagger'>
Traceback (most recent call last):
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 1365, in _do_call
return fn(*args)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 1350, in _run_fn
target_list, run_metadata)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 1443, in _call_tf_sessionrun
run_metadata)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Assign requires shapes of both tensors to match. lhs shape= [13,13] rhs shape= [37,37]
[[{{node save/Assign_76}}]]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saver.py", line 1290, in restore
{self.saver_def.filename_tensor_name: save_path})
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 956, in run
run_metadata_ptr)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 1180, in _run
feed_dict_tensor, options, run_metadata)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 1359, in _do_run
run_metadata)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\client\session.py", line 1384, in _do_call
raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Assign requires shapes of both tensors to match. lhs shape= [13,13] rhs shape= [37,37]
[[node save/Assign_76 (defined at C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\framework\ops.py:1748) ]]
Original stack trace for 'save/Assign_76':
File "c:/Users/sghanta/Desktop/NER/train_model.py", line 12, in <module>
ner_model = train_model(configs.ner.ner_ontonotes_bert_mult)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\__init__.py", line 29, in train_model
train_evaluate_model_from_config(config, download=download, recursive=recursive)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\commands\train.py", line 121, in train_evaluate_model_from_config
trainer.train(iterator)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\trainers\nn_trainer.py", line 334, in train
self.fit_chainer(iterator)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\trainers\fit_trainer.py", line 104, in fit_chainer
component = from_params(component_config, mode='train')
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\common\params.py", line 106, in from_params
component = obj(**dict(config_params, **kwargs))
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\models\tf_backend.py", line 76, in __call__
obj.__init__(*args, **kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\models\tf_backend.py", line 28, in _wrapped
return func(*args, **kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\models\bert\bert_sequence_tagger.py", line 529, in __init__
**kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\models\bert\bert_sequence_tagger.py", line 259, in __init__
self.load()
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\models\tf_backend.py", line 28, in _wrapped
return func(*args, **kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\models\bert\bert_sequence_tagger.py", line 457, in load
return super().load(exclude_scopes=exclude_scopes, **kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\models\tf_model.py", line 251, in load
return super().load(exclude_scopes=exclude_scopes, **kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\deeppavlov\core\models\tf_model.py", line 54, in load
saver = tf.train.Saver(var_list)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saver.py", line 828, in __init__
self.build()
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saver.py", line 840, in build
self._build(self._filename, build_save=True, build_restore=True)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saver.py", line 878, in _build
build_restore=build_restore)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saver.py", line 508, in _build_internal
restore_sequentially, reshape)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saver.py", line 350, in _AddRestoreOps
assign_ops.append(saveable.restore(saveable_tensors, shapes))
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\training\saving\saveable_object_util.py", line 73, in restore
self.op.get_shape().is_fully_defined())
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\ops\state_ops.py", line 227, in assign
validate_shape=validate_shape)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\ops\gen_state_ops.py", line 66, in assign
use_locking=use_locking, name=name)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\framework\op_def_library.py", line 794, in _apply_op_helper
op_def=op_def)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\util\deprecation.py", line 507, in new_func
return func(*args, **kwargs)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\framework\ops.py", line 3357, in create_op
attrs, op_def, compute_device)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\framework\ops.py", line 3426, in _create_op_internal
op_def=op_def)
File "C:\Users\sghanta\Desktop\NER\env\lib\site-packages\tensorflow_core\python\framework\ops.py", line 1748, in __init__
self._traceback = tf_stack.extract_stack()
Can anyone explain how to solve it.
[1]: http://docs.deeppavlov.ai/en/master/features/models/ner.html

conll2003_reader dataset reader failed to parse the following line:
O
conll2003_reader dataset reader expects that line is either empty or contains a token and a label. In your case only label is present.
So, I would suggest to clean your data from empty lines with labels.
Sample text from DeepPavlov docs:
EU B-ORG
rejects O
the O
call O
of O
Germany B-LOC
to O
boycott O
lamb O
from O
Great B-LOC
Britain I-LOC
. O
China B-LOC

(1054, "Unknown column 'leçon_lesson.subject_id' in 'field list'")

i have been making some changes on my model 'lesson' and suddenly i couldn't use my model on my django website with MySql data base.
when i try to use it on a view i got this error
(1054, "Unknown column 'leçon_lesson.subject_id' in 'field list'")
the commands makemigrations and migrate works fine but this error occurs when using the model only
this is the model.py
from django.db import models
from .validators import *
from scolarité.models.level import Level
from scolarité.models.subject import Subject
class Lesson(models.Model):
level = models.ForeignKey(Level,on_delete=models.CASCADE)
subject = models.ForeignKey(Subject,on_delete=models.CASCADE)
chapiter = models.CharField(max_length=200)
lesson = models.CharField(max_length=200)
skill = models.CharField(max_length=200)
vacations = models.IntegerField()
link = models.URLField(max_length=700,null=True,blank=True)
remarques = models.TextField(null=True,blank=True)
order = models.IntegerField()
created = models.DateTimeField(auto_now_add=True, auto_now=False)
updated = models.DateTimeField(auto_now=True)
state = models.BooleanField(default=False)
def __str__(self):
return self.lesson
views.py
#=========================== view lessons =====================
#login_required #use this to make the view accessible for logged in users only
def view_lessons_list(request,subject_id):
request.session['subject_id']= subject_id #assign subject id value to session
level = Level.objects.get(id=request.session['level_id']) #getting the level model
subject = Subject.objects.get(id=request.session['subject_id']) #getting the subject model
lessons = Lesson.objects.filter(subject=subject ,level=level) #filtering the lesson based on the chosen level and subject
context={'lessons':lessons,}
return render(request,'leçon/view_lessons_list.html',context)
the traceback
Traceback (most recent call last):
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\core\handlers\exception.py", line 41, in inner
response = get_response(request)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\contrib\auth\decorators.py", line 23, in _wrapped_view
return view_func(request, *args, **kwargs)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\leçon\views.py", line 25, in view_lessons_list
return render(request,'leçon/view_lessons_list.html',context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\shortcuts.py", line 30, in render
content = loader.render_to_string(template_name, context, request, using=using)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader.py", line 68, in render_to_string
return template.render(context, request)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\backends\django.py", line 66, in render
return self.template.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 207, in render
return self._render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 199, in _render
return self.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader_tags.py", line 177, in render
return compiled_parent._render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 199, in _render
return self.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader_tags.py", line 177, in render
return compiled_parent._render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 199, in _render
return self.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\loader_tags.py", line 72, in render
result = block.nodelist.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 990, in render
bit = node.render_annotated(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\base.py", line 957, in render_annotated
return self.render(context)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\template\defaulttags.py", line 173, in render
len_values = len(values)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\query.py", line 232, in __len__
self._fetch_all()
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\query.py", line 1102, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\query.py", line 53, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\models\sql\compiler.py", line 876, in execute_sql
cursor.execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\utils.py", line 80, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\utils\six.py", line 685, in reraise
raise value.with_traceback(tb)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\django\db\backends\mysql\base.py", line 101, in execute
return self.cursor.execute(query, args)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 247, in execute
res = self._query(query)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\cursors.py", line 374, in _do_query
db.query(q)
File "C:\Users\YAHYA-PC\Desktop\CourseCode\env\lib\site-packages\MySQLdb\connections.py", line 292, in query
_mysql.connection.query(self, query)
django.db.utils.OperationalError: (1054, "Unknown column 'leçon_lesson.subject_id' in 'field list'")
[11/Oct/2020 20:36:35] "GET /le%C3%A7on/view_lessons_list/18/ HTTP/1.1" 500 299785
i have been trying deleting the migration files and and different youtube tutorials but nothing seems to work for me i keep getting different database errors and start all over again with this error
is there any solution or fix for this matter ?it's really frustrating and letting me down

i just found out a solution not the most efficient but it works i just created a new app with different name and moved all the models and views to it and run makemigrations and migrate and that's it

Airflow DAG throws RecursionError triggered via Web console

I get following error, when I am trying to trigger DAG which is using custom BaseOperator.
here is the error,
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid start byte
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2446, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1951, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1820, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1935, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.7/site-packages/flask_admin/base.py", line 69, in inner
return self._run_view(f, *args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/flask_admin/base.py", line 368, in _run_view
return fn(self, *args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/flask_login/utils.py", line 258, in decorated_view
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/www/utils.py", line 290, in wrapper
return f(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/www/utils.py", line 337, in wrapper
return f(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/utils/db.py", line 74, in wrapper
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/www/views.py", line 1213, in trigger
external_trigger=True
File "/usr/local/lib/python3.7/site-packages/airflow/utils/db.py", line 74, in wrapper
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/models/dag.py", line 1659, in create_dagrun
session=session)
File "/usr/local/lib/python3.7/site-packages/airflow/utils/db.py", line 70, in wrapper
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/models/dag.py", line 1346, in create_dagrun
run.refresh_from_db()
File "/usr/local/lib/python3.7/site-packages/airflow/utils/db.py", line 74, in wrapper
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/airflow/models/dagrun.py", line 109, in refresh_from_db
DR.run_id == self.run_id
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3347, in one
ret = self.one_or_none()
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3316, in one_or_none
ret = list(self)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3389, in __iter__
return self._execute_and_instances(context)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3414, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 982, in execute
return meth(self, multiparams, params)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/sql/elements.py", line 293, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1101, in _execute_clauseelement
distilled_params,
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1250, in _execute_context
e, statement, parameters, cursor, context
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1478, in _handle_dbapi_exception
util.reraise(*exc_info)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 153, in reraise
raise value
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1246, in _execute_context
cursor, statement, parameters, context
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 588, in do_execute
cursor.execute(statement, parameters)
File "/usr/local/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 272, in execute
self._handle_result(result)
File "/usr/local/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 163, in _handle_result
self._handle_resultset()
File "/usr/local/lib/python3.7/site-packages/mysql/connector/cursor_cext.py", line 651, in _handle_resultset
self._rows = self._cnx.get_rows()[0]
File "/usr/local/lib/python3.7/site-packages/mysql/connector/connection_cext.py", line 318, in get_rows
else self._cmysql.fetch_row()
SystemError: <method 'fetch_row' of '_mysql_connector.MySQL' objects> returned a result with an error set
My Code is as follows:
from airflow.plugins_manager import AirflowPlugin
from airflow.utils.decorators import apply_defaults
class TestOperator(BaseOperator):
template_fields = ('param1')
ui_color = '#A7E6A7'
#apply_defaults
def __init__(self,param1,*args, **kwargs):
self.param1 = param1
super(TestOperator, self).__init__(*args, **kwargs)
def execute(self):
print ('welcome to airflow')
class TestOperatorPlugin(AirflowPlugin):
name = "TestOperator_plugin"
operators = [TestOperator]
--here is Dag,
from TestOperator import TestOperator
from airflow import DAG
from datetime import datetime
prog_args = {
'depends_on_past': False, 'param1' : 'testOne'
}
testMYDAG = DAG('TestMYDAG', start_date = datetime(2020, 2, 18) , description='TestMYDAG', default_args = prog_args, schedule_interval=None)
testOp = TestOperator(task_id='test_dag', dag=testMYDAG )
testOp

Team, I had resolved issue by adding encoding scheme to utf-8 in airflow.cfg file, Also, it needs to be appended to sql_alchemy_connection string.