Question

我正在使用SQlAlchemy推荐的uuid（）支持加载项，如here所述。但是，当我在SQLAlchemy代码中使用它时，我收到此错误：

TypeError: 'module' object is not callable

参考模块，GUID。

以下是直接来自源代码的GUID代码：

GUID.py

from sqlalchemy.types import TypeDecorator, CHAR
from sqlalchemy.dialects.postgresql import UUID
import uuid

class GUID(TypeDecorator):
  """Platform-independent GUID type.

  Uses Postgresql's UUID type, otherwise uses
  CHAR(32), storing as stringified hex values.

  """
  impl = CHAR

  def load_dialect_impl(self, dialect):
    if dialect.name == 'postgresql':
      return dialect.type_descriptor(UUID())
    else:
      return dialect.type_descriptor(CHAR(32))

  def process_bind_param(self, value, dialect):
    if value is None:
      return value
    elif dialect.name == 'postgresql':
      return str(value)
    else:
      if not isinstance(value, uuid.UUID):
        return "%.32x" % uuid.UUID(value)
      else:
        # hexstring
        return "%.32x" % value

  def process_result_value(self, value, dialect):
    if value is None:
      return value
    else:
      return uuid.UUID(value)

这是我的模型，称之为

user.py

from app import db
from datetime import datetime
from app.custom_db import GUID

class User(db.Model):
  __tablename__ = 'users'
  id = db.Column(GUID(), primary_key=True)
  email = db.Column(db.String(80), unique=True)
  name = db.Column(db.String(80))
  password = db.Column(db.String(80))
  datejoined = db.Column(db.DateTime,default = db.func.now())

  def __init__(self, name, email, password):
    self.name = name
    self.email = email
    self.password = password

  def __repr__(self):
    return '<User %r>' % self.name

知道为什么我不能创建这个uuid() PKey吗？

这是完整的追溯

Traceback (most recent call last):                                                                                                                                                                                                            
  File "./run.py", line 3, in <module>                                                                                                                                                                                                        
    from app import app                                                                                                                                                                                                                       
  File "/home/achumbley/Pile/app/__init__.py", line 23, in <module>                                                                                                                                                                           
    from models import user                                                                                                                                                                                                                   
  File "/home/achumbley/Pile/app/models/user.py", line 5, in <module>                                                                                                                                                                         
    class User(db.Model):                                                                                                                                                                                                                     
  File "/home/achumbley/Pile/app/models/user.py", line 7, in User                                                                                                                                                                             
    id = db.Column(GUID(), primary_key=True)                                                                                                                                                                                                  
TypeError: 'module' object is not callable

Answer 1

如果您的文件是GUID.py，并且您将其导入为from app.custom_db import GUID（就像您拥有的那样），那么您真正导入的是文件，而不是类。要上课，您需要致电GUID.GUID()。

或者，您可以通过将其导入为：

来导入该类

from app.custom_db.GUID import GUID

SQLAlchemy'模块'不可调用

1 个答案: