peewee.OperationalError：表要点没有名为 name 的列

Question

当我的代码看起来没有问题时，我总是在我的代码中收到这个错误。我在 Flask 中使用 Peewee 和 SQLite。

这是我的代码。

from peewee import *

import datetime

DB = SqliteDatabase("gist.db")

class Gist(Model):
    name = CharField()
    content = TextField()
    description = TextField()
    join_date = DateTimeField(default=datetime.datetime.now)

    class Meta:
       database = DB

def initialize():
    DB.connect()
    DB.create_tables([Gist], safe=True)
    DB.close()

这里是创建实例的代码：

@app.route("/", methods=("GET", "POST"))
def index():
    form = forms.GistForm()
    if form.validate_on_submit():
        models.Gist.create(name=form.name.data,
                           content=form.content.data,
                           description=form.description.data)
        flash("Message posted! Thanks!", "success")
    return render_template("index.html", form=form)

感谢您提供的任何帮助！

编辑：感兴趣的人的堆栈跟踪

Traceback (most recent call last):
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1403, in handle_exc
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1477, in full_dispa
    rv = self.handle_user_exception(e)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1381, in handle_use
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\_compat.py", line 33, in reraise
    raise value
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1475, in full_dispa
    rv = self.dispatch_request()
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\flask\app.py", line 1461, in dispatch_r
    return self.view_functions[rule.endpoint](**req.view_args)
  File "B:\Sites\GistClone\app.py", line 21, in index
    description=form.description.data)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 4494, in create
    inst.save(force_insert=True)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 4680, in save
    pk_from_cursor = self.insert(**field_dict).execute()
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 3213, in execute
    cursor = self._execute()
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 2628, in _execute
    return self.database.execute_sql(sql, params, self.require_commit)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 3461, in execute_sql
    self.commit()
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 3285, in __exit__
    reraise(new_type, new_type(*exc_args), traceback)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 127, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\Max\AppData\Local\Programs\Python\Python35-32\lib\site-packages\peewee.py", line 3454, in execute_sql
    cursor.execute(sql, params or ())
peewee.OperationalError: table gist has no column named name

Answer 1

我遇到了同样的错误并通过删除数据库 .db 文件（在您的情况下为“gist.db”）来修复它。

如果在创建数据库文件后，您修改或添加了任何模型字段，那么 peewee 无法识别原始数据库中修改的和/或新的字段并抛出此错误。删除旧的 .db 文件后，将在启动时重新创建一个包含最新字段的新文件，这为我解决了这个问题。

Answer 2

正如@davejlin 所写，如果删除 db 文件并重新创建它，问题将得到解决。 或者，如果数据库中有重要数据，则可以使用Schema Migrations。

来自peewee文档：

创建表后，如果您选择修改数据库模式（通过添加、删除或以其他方式更改列），您将需要：

• 删除表格并重新创建它。
• 运行一个或多个 ALTER TABLE 查询。 Peewee 附带了一个模式迁移工具，可以大大简化这一过程。查看 schema migrations 文档以获取详细信息。