我的档案中包含以下模型listpull/models.py：

from datetime import datetime

from listpull import db


class Job(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    list_type_id = db.Column(db.Integer, db.ForeignKey('list_type.id'),
                             nullable=False)
    list_type = db.relationship('ListType',
                                backref=db.backref('jobs', lazy='dynamic'))
    record_count = db.Column(db.Integer, nullable=False)
    status = db.Column(db.Integer, nullable=False)
    sf_job_id = db.Column(db.Integer, nullable=False)
    created_at = db.Column(db.DateTime, nullable=False)
    compressed_csv = db.Column(db.LargeBinary)

    def __init__(self, list_type, created_at=None):
        self.list_type = list_type
        if created_at is None:
            created_at = datetime.utcnow()
        self.created_at = created_at

    def __repr__(self):
        return '<Job {}>'.format(self.id)


class ListType(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), unique=True, nullable=False)

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

    def __repr__(self):
        return '<ListType {}>'.format(self.name)

我打电话./run.py init，然后./run.py migrate然后./run.py upgrade，我看到迁移文件生成，但其空：

"""empty message

Revision ID: 5048d48b21de
Revises: None
Create Date: 2013-10-11 13:25:43.131937

"""

# revision identifiers, used by Alembic.
revision = '5048d48b21de'
down_revision = None

from alembic import op
import sqlalchemy as sa


def upgrade():
    ### commands auto generated by Alembic - please adjust! ###
    pass
    ### end Alembic commands ###


def downgrade():
    ### commands auto generated by Alembic - please adjust! ###
    pass
    ### end Alembic commands ###

运行

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from listpull import manager
manager.run()

listpull / init.py

# -*- coding: utf-8 -*-
# pylint: disable-msg=C0103

""" listpull module """

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.script import Manager
from flask.ext.migrate import Migrate, MigrateCommand
from mom.client import SQLClient
from smartfocus.restclient import RESTClient


app = Flask(__name__)
app.config.from_object('config')

db = SQLAlchemy(app)

migrate = Migrate(app, db)

manager = Manager(app)
manager.add_command('db', MigrateCommand)

mom = SQLClient(app.config['MOM_HOST'],
                app.config['MOM_USER'],
                app.config['MOM_PASSWORD'],
                app.config['MOM_DB'])

sf = RESTClient(app.config['SMARTFOCUS_URL'],
                app.config['SMARTFOCUS_LOGIN'],
                app.config['SMARTFOCUS_PASSWORD'],
                app.config['SMARTFOCUS_KEY'])

import listpull.models
import listpull.views

更新

如果我通过运行shell ./run.py shell，然后执行do from listpull import *和call db.create_all()，那么将获得以下架构：

mark.richman@MBP:~/code/nhs-listpull$ sqlite3 app.db 
-- Loading resources from /Users/mark.richman/.sqliterc
SQLite version 3.7.12 2012-04-03 19:43:07
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .schema
CREATE TABLE job (
    id INTEGER NOT NULL, 
    list_type_id INTEGER NOT NULL, 
    record_count INTEGER NOT NULL, 
    status INTEGER NOT NULL, 
    sf_job_id INTEGER NOT NULL, 
    created_at DATETIME NOT NULL, 
    compressed_csv BLOB, 
    PRIMARY KEY (id), 
    FOREIGN KEY(list_type_id) REFERENCES list_type (id)
);
CREATE TABLE list_type (
    id INTEGER NOT NULL, 
    name VARCHAR(80) NOT NULL, 
    PRIMARY KEY (id), 
    UNIQUE (name)
);
sqlite> 

不幸的是，迁移仍然无法进行。