django - модели. ПрофиКлюч к той же модели, к себе - PullRequest
0 голосов
/ 03 апреля 2020

Мир вам! В настоящее время я работаю над своим первым django проектом, конечно же, как и все django разработчики, я сталкивался с таким количеством ошибок, моя текущая проблема заключается в том, что я хочу настроить систему комментариев (DB, front-end, back-end), я искал решение для этого, но ответа не найдено. это мои модели:

from django.db import models
from datetime import datetime
from django.contrib.auth.models import User


class Comment(models.Model):
    # if I am a reply, so "comment" my parent comment, so each comment will have replies_set
    comment = models.ForeignKey('self', on_delete=models.CASCADE, default = '')
    user = models.ForeignKey(User, on_delete=models.CASCADE, default='')
    value = models.CharField(max_length=100, default='')
    date = models.DateField(default = datetime.now())
    def __str__(self):
        return self.value


class Reaction(models.Model):
    comment = models.ForeignKey(Comment, on_delete=models.CASCADE, default = '')
    # the user that this love belong to
    user = models.ForeignKey(User, on_delete=models.CASCADE, default='')
    # type: like:0, love:1, laugh:2, cry:3, angry:4, ... 
    TYPES = [
        (0, 'like'),
        (1, 'love'),
        (2, 'laugh'),
        (3, 'cry'),
        (4, 'angry'),
    ]
    reaction_type = models.IntegerField(choices=TYPES, default=0)
    def __str__(self):
        return self.types[self.reaction_type][1]

Я хочу сделать что-то похожее на твиттер-комментарии, чтобы навсегда ответить не на такую ​​вещь, как в StackOverflow, иметь root пост или вопрос и комментарии с ответом для пользователь не так много отвечает за комментарий и отвечает за ответы.


Как обычно, (ошибки):

SystemCheckError: System check identified some issues:

ERRORS:
calculator_app.Comment.comment: (fields.E303) Reverse query name for 'Comment.comment' clashes with field name 'Comment.comment'.
        HINT: Rename field 'Comment.comment', or add/change a related_name argument to the definition for field 'Comment.comment'.

Решено добавлением related_name='replies' к атрибуту комментария в Модель "Комментарий",

class Comment(models.Model):
    # if I am a reply, so "comment" my parent comment, so each comment will have replies_set
    comment = models.ForeignKey('self', on_delete=models.CASCADE, default = '', related_name='replies')

Еще одна ошибка, которая еще не устранена ::: вывод cmd

python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, calculator_app, contenttypes, home_page_app, sessions
Running migrations:
  Applying calculator_app.0003_auto_20200402_1800...Traceback (most recent call last):
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: near ")": syntax error

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py", line 364, in execute
    output = self.handle(*args, **options)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
    fake_initial=fake_initial,
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\executor.py", line 117, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\executor.py", line 147, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
    state = migration.apply(state, schema_editor)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\migrations\operations\fields.py", line 178, in database_forwards
    schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\schema.py", line 345, in remove_field
    self._remake_table(model, delete_field=field)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\schema.py", line 286, in _remake_table
    self.quote_name(model._meta.db_table),
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
    cursor.execute(sql, params)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py", line 99, in execute
    return super().execute(sql, params)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py", line 67, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "C:\Users\ms205\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
    return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: near ")": syntax error

У кого-нибудь есть предложения по решению этой проблемы?

1 Ответ

0 голосов
/ 08 апреля 2020

Данная ошибка устранена, когда я преобразовал в MySQL базы данных ...

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