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當試圖在我的瓶殼中導入模型時，我得到一個InvalidRequestError。在瓶殼中導入Flask模型時出現InvalidRequestError
它似乎與我的項目的初始 .py有關，如下所示。當我在這個文件中刪除from . import models時，我可以將我的模型導入到我的燒瓶外殼中，沒有任何問題。問題是我需要這個「導入」來運行我的數據庫遷移...
任何人都可以提供幫助嗎？
$ flask shell
Python 3.6.2 |Continuum Analytics, Inc.| (default, Jul 20 2017, 13:51:32)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
IPython: 6.2.0
App: audiolabeling
Instance: /home/jul/dev/audiolabeling/instance
In [1]: from models import TagType
---------------------------------------------------------------------------
InvalidRequestError Traceback (most recent call last)
<ipython-input-1-ebb7905a9c4e> in <module>()
----> 1 from models import TagType
~/dev/audiolabeling/audiolabeling/models.py in <module>()
13
14
---> 15 class TagType(db.Model):
16
17 id = db.Column(db.Integer, primary_key=True)
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py in __init__(self, name, bases, d)
600 def __init__(self, name, bases, d):
601 bind_key = d.pop('__bind_key__', None) or getattr(self, '__bind_key__', None)
--> 602 DeclarativeMeta.__init__(self, name, bases, d)
603
604 if bind_key is not None and hasattr(self, '__table__'):
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/sqlalchemy/ext/declarative/api.py in __init__(cls, classname, bases, dict_)
62 def __init__(cls, classname, bases, dict_):
63 if '_decl_class_registry' not in cls.__dict__:
---> 64 _as_declarative(cls, classname, cls.__dict__)
65 type.__init__(cls, classname, bases, dict_)
66
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/sqlalchemy/ext/declarative/base.py in _as_declarative(cls, classname, dict_)
86 return
87
---> 88 _MapperConfig.setup_mapping(cls, classname, dict_)
89
90
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/sqlalchemy/ext/declarative/base.py in setup_mapping(cls, cls_, classname, dict_)
101 else:
102 cfg_cls = _MapperConfig
--> 103 cfg_cls(cls_, classname, dict_)
104
105 def __init__(self, cls_, classname, dict_):
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/sqlalchemy/ext/declarative/base.py in __init__(self, cls_, classname, dict_)
129 self._extract_declared_columns()
130
--> 131 self._setup_table()
132
133 self._setup_inheritance()
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/sqlalchemy/ext/declarative/base.py in _setup_table(self)
393 tablename, cls.metadata,
394 *(tuple(declared_columns) + tuple(args)),
--> 395 **table_kw)
396 else:
397 table = cls.__table__
~/.miniconda3/envs/audiolabeling/lib/python3.6/site-packages/sqlalchemy/sql/schema.py in __new__(cls, *args, **kw)
419 "to redefine "
420 "options and columns on an "
--> 421 "existing Table object." % key)
422 table = metadata.tables[key]
423 if extend_existing:
InvalidRequestError: Table 'tag_type' is already defined for this MetaData instance. Specify 'extend_existing=True' to redefine options and columns on an existing Table object.
models.py
from audiolabeling import db
import enum
class FeedBackType(enum.Enum):
NONE = "none"
HIDDENIMAGE = "hiddenImage"
class VisualizationType(enum.Enum):
WAVEFORM = "waveform"
SPECTROGRAM = "spectrogram"
class TagType(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String, unique=True)
annotationtags = db.relationship('AnnotationTag',
backref='tagtype',
lazy='dynamic')
def __repr__(self):
return '<id {}>'.format(self.id)
class Task(db.Model):
id = db.Column(db.Integer, primary_key=True)
feedback = db.Column(db.Enum(FeedBackType))
annotationtags = db.relationship('AnnotationTag',
backref='task',
lazy='dynamic')
name = db.Column(db.String, unique=True)
def __repr__(self):
return '<id {}>'.format(self.id)
class AnnotationTag(db.Model):
id = db.Column(db.Integer, primary_key=True)
tagtype_id = db.Column(db.Integer, db.ForeignKey(TagType.id))
task_id = db.Column(db.Integer, db.ForeignKey(Task.id))
name = db.Column(db.String, unique=True)
annotations = db.relationship('Annotation',
backref='annotationtag',
lazy='dynamic')
def __repr__(self):
return '<id {}>'.format(self.id)
class Audio(db.Model):
id = db.Column(db.Integer, primary_key=True)
url = db.Column(db.String, unique=True)
tagtype_id = db.Column(db.Integer, db.ForeignKey(TagType.id))
task_id = db.Column(db.Integer, db.ForeignKey(Task.id))
name = db.Column(db.String, unique=True)
annotations = db.relationship('Annotation',
backref='audio',
lazy='dynamic')
def __repr__(self):
return '<id {}>'.format(self.id)
class Annotation(db.Model):
id = db.Column(db.Integer, primary_key=True)
annotationtag_id = db.Column(db.Integer, db.ForeignKey(AnnotationTag.id))
audio_id = db.Column(db.Integer, db.ForeignKey('audio.id'))
def __repr__(self):
return '<id {}>'.format(self.id)
初始化的.py
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
app = Flask(__name__, instance_relative_config=True)
app.config.from_pyfile('flask.cfg')
db = SQLAlchemy(app)
migrate = Migrate(app, db)
from . import models # OK IF I REMOVE THIS
from . import views