인프런 커뮤니티 질문&답변

선생님, 안녕하세요.

장고 입문해서, 강의를 잘 듣고 있습니다.

강의 들으면서 아래와 같은 문제가 생겨서 문의 드립니다.

조언 부탁드립니다.

1. 현재코드

다음과 같이 작성하면 문제가 없습니다

from django.db import models
from django.conf import settings

# Create your models here.
class Post(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    message = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True, null=True)
    updated_at = models.DateTimeField(auto_now=True, null=True)
    title = models.CharField(max_length=100, db_index=True)
    # slug = models.SlugField(allow_unicode=True, db_column=True, null=True) #제목과 숫자로 이루어진 url 생성시 사용
    desc = models.TextField(blank=True) # 빈문자열도 허용
    image = models.ImageField(blank=True)
    comment_count = models.PositiveIntegerField(default=0) # 양수만 처리
    tag_set = models.ManyToManyField('Tag') # 하나의 포스트는 다수의 태그
    is_publish = models.BooleanField(default=False)

2. 문제 상황 재현

slug 주석해제하고 DB 마이그레이션 문제가 생깁니다.

from django.db import models
from django.conf import settings

# Create your models here.
class Post(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    message = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True, null=True)
    updated_at = models.DateTimeField(auto_now=True, null=True)
    title = models.CharField(max_length=100, db_index=True)
    slug = models.SlugField(allow_unicode=True, db_column=True, null=True) #제목과 숫자로 이루어진 url 생성시 사용
    desc = models.TextField(blank=True) # 빈문자열도 허용
    image = models.ImageField(blank=True)
    comment_count = models.PositiveIntegerField(default=0) # 양수만 처리
    tag_set = models.ManyToManyField('Tag') # 하나의 포스트는 다수의 태그
    is_publish = models.BooleanField(default=False)

3. 에러코드

그런데 slug 필드 주석 해제하고 마이그레이션 하면 다음과 같은 에러가 생깁니다.

(venv) C:\Users\kwanw\Desktop\askcompany>python manage.py migrate instagram  
Operations to perform:
  Apply all migrations: instagram
Running migrations:
  Applying instagram.0006_post_slug...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\kwanw\Desktop\askcompany\venv\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\core\management\__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\core\management\base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\core\management\base.py", line 369, in execute
    output = self.handle(*args, **options)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\core\management\base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\core\management\commands\migrate.py", line 233, in handle
    fake_initial=fake_initial,
  File "C:\Users\kwanw\Desktop\askcompany\venv\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\kwanw\Desktop\askcompany\venv\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\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
    state = migration.apply(state, schema_editor)
  File "C:\Users\kwanw\Desktop\askcompany\venv\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\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\migrations\operations\fields.py", line 112, in database_forwards
    field,
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\backends\sqlite3\schema.py", line 328, in add_field
    self._remake_table(model, create_field=field)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\backends\sqlite3\schema.py", line 280, in _remake_table
    self.create_model(new_model)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\backends\base\schema.py", line 322, in create_model
    sql, params = self.table_sql(model)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\backends\base\schema.py", line 184, in table_sql
    self.quote_name(field.column),
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\backends\base\schema.py", line 145, in quote_name
    return self.connection.ops.quote_name(name)
  File "C:\Users\kwanw\Desktop\askcompany\venv\lib\site-packages\django\db\backends\sqlite3\operations.py", line 164, in quote_name
    if name.startswith('"') and name.endswith('"'):
AttributeError: 'bool' object has no attribute 'startswith'

4. 관련 마이그레이션 파일

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('instagram', '0005_profile'),
    ]

    operations = [
        migrations.AddField(
            model_name='post',
            name='slug',
            field=models.SlugField(allow_unicode=True, db_column=True, null=True),
        ),
    ]