Error value too long for type character varying(300), crashes for no apparent reason?

Question

Django

I connected the postgres database to the project, carried out all the migrations, they were applied, there is no limit of 300 characters anywhere in the models, but this error crashes. Moreover, everything is saved in the database, after an error occurs, I reload the page and the value is saved, there are no errors in the database itself when adding directly, there are no restrictions on 300 characters either. If it's not the database, then what is it? Maybe I did the migration wrong? But they applied correctly, I deleted them, deleted the database, recreated the database, changed the encodings, but everything was in vain, the migrations are applied, but the error continues to crash. Could this be an ORM issue? Please let me know where is the problem and what am I doing wrong.

Traceback:

Environment:


Request Method: POST
Request URL: http://192.168.10.222:8080/base/edit_project/1099/

Django Version: 2.2
Python Version: 3.8.7
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'templatesApp',
 'changelog',
 'accounts',
 'dashboard',
 'reference',
 'baseTables',
 'adminTables',
 'reports']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback:

File "/usr/local/lib/python3.8/dist-packages/django/db/backends/utils.py" in _execute
  84.                 return self.cursor.execute(sql, params)

The above exception (value too long for type character varying(300)
) was the direct cause of the following exception:

File "/usr/local/lib/python3.8/dist-packages/django/core/handlers/exception.py" in inner
  34.             response = get_response(request)

File "/usr/local/lib/python3.8/dist-packages/django/core/handlers/base.py" in _get_response
  115.                 response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.8/dist-packages/django/core/handlers/base.py" in _get_response
  113.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.8/dist-packages/django/contrib/auth/decorators.py" in _wrapped_view
  21.                 return view_func(request, *args, **kwargs)

File "/home/itpw/project/nik/vkmtsup_django2/vkmt_sup/baseTables/views.py" in EditProjectView
  613.                 obj.save()

File "/usr/local/lib/python3.8/dist-packages/django/db/models/base.py" in save
  740.         self.save_base(using=using, force_insert=force_insert,

File "/usr/local/lib/python3.8/dist-packages/django/db/models/base.py" in save_base
  788.             post_save.send(

File "/usr/local/lib/python3.8/dist-packages/django/dispatch/dispatcher.py" in send
  173.         return [

File "/usr/local/lib/python3.8/dist-packages/django/dispatch/dispatcher.py" in <listcomp>
  174.             (receiver, receiver(signal=self, sender=sender, **named))

File "/home/itpw/project/nik/vkmtsup_django2/vkmt_sup/changelog/signals.py" in journal_save_handler
  19.                 ChangeLog.add(instance, loggedIn.current_user, loggedIn.address, ACTION_UPDATE, (instance._meta.get_field(change).verbose_name.title()+':   '+str(changed[change]['old'])+' --> ' +str(changed[change]['new'])), id=last_saved['id'])

File "/home/itpw/project/nik/vkmtsup_django2/vkmt_sup/changelog/models.py" in add
  47.         log.save()

File "/usr/local/lib/python3.8/dist-packages/django/db/models/base.py" in save
  740.         self.save_base(using=using, force_insert=force_insert,

File "/usr/local/lib/python3.8/dist-packages/django/db/models/base.py" in save_base
  777.             updated = self._save_table(

File "/usr/local/lib/python3.8/dist-packages/django/db/models/base.py" in _save_table
  870.             result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)

File "/usr/local/lib/python3.8/dist-packages/django/db/models/base.py" in _do_insert
  907.         return manager._insert([self], fields=fields, return_id=update_pk,

File "/usr/local/lib/python3.8/dist-packages/django/db/models/manager.py" in manager_method
  82.                 return getattr(self.get_queryset(), name)(*args, **kwargs)

File "/usr/local/lib/python3.8/dist-packages/django/db/models/query.py" in _insert
  1186.         return query.get_compiler(using=using).execute_sql(return_id)

File "/usr/local/lib/python3.8/dist-packages/django/db/models/sql/compiler.py" in execute_sql
  1332.                 cursor.execute(sql, params)

File "/usr/local/lib/python3.8/dist-packages/django/db/backends/utils.py" in execute
  99.             return super().execute(sql, params)

File "/usr/local/lib/python3.8/dist-packages/django/db/backends/utils.py" in execute
  67.         return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)

File "/usr/local/lib/python3.8/dist-packages/django/db/backends/utils.py" in _execute_with_wrappers
  76.         return executor(sql, params, many, context)

File "/usr/local/lib/python3.8/dist-packages/django/db/backends/utils.py" in _execute
  84.                 return self.cursor.execute(sql, params)

File "/usr/local/lib/python3.8/dist-packages/django/db/utils.py" in __exit__
  89.                 raise dj_exc_value.with_traceback(traceback) from exc_value

File "/usr/local/lib/python3.8/dist-packages/django/db/backends/utils.py" in _execute
  84.                 return self.cursor.execute(sql, params)

Exception Type: DataError at /base/edit_project/1099/
Exception Value: value too long for type character varying(300)

Answer 1

deal with ChangeLog.add