try db_migrate

app/__init__.py

@@ -1,8 +1,18 @@
 from flask import Flask
-from flask.ext.sqlalchemy import SQLAlchemy
+from flask_sqlalchemy import SQLAlchemy
+from app import views, models
+
+import os
+from flask.ext.login import LoginManager
+from flask.ext.openid import OpenID
+from config import basedir
+# from flask.ext.sqlalchemy import SQLAlchemy
 
 app = Flask(__name__)
 app.config.from_object('config')
 db = SQLAlchemy(app)
 
-from app import views, models
+
+lm = LoginManager()
+lm.init_app(app)
+oid = OpenID(app, os.path.join(basedir, 'tmp'))

app/forms.py

@@ -1,4 +1,5 @@
-from flask.ext.wtf import Form
+from flask_wtf import Form
+# from flask.ext.wtf import Form
 from wtforms import StringField, BooleanField
 from wtforms.validators import DataRequired
 

app/models.py

@@ -1,9 +1,23 @@
 from app import db
 
+
 class User(db.Model):
+    # 对于一个一对多的关系，db.relationship 字段通常是定义在“一”这一边
+    # 在这种关系下，得到一个 user.posts 成员，它给出一个用户所有的 blog
     id = db.Column(db.Integer, primary_key = True)
     nickname = db.Column(db.String(64), index = True, unique = True)
     email = db.Column(db.String(120), index = True, unique = True)
+    post = db.relationship('Post', backref='author', lazy='dynamic')
+
+    def __repr__(self):
+        return '<User %r>' % self.nickname
+
+
+class Post(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    body = db.Column(db.String(140))
+    timestamp = db.Column(db.DateTime)
+    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
 
     def __repr__(self):
-        return '<User %r>' % (self.nickname)
+        return '<Post %r>' % self.body

db_repository/versions/002_migration.py

@@ -0,0 +1,28 @@
+from sqlalchemy import *
+from migrate import *
+
+
+from migrate.changeset import schema
+pre_meta = MetaData()
+post_meta = MetaData()
+post = Table('post', post_meta,
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('body', String(length=140)),
+    Column('timestamp', DateTime),
+    Column('user_id', Integer),
+)
+
+
+def upgrade(migrate_engine):
+    # Upgrade operations go here. Don't create your own engine; bind
+    # migrate_engine to your metadata
+    pre_meta.bind = migrate_engine
+    post_meta.bind = migrate_engine
+    post_meta.tables['post'].create()
+
+
+def downgrade(migrate_engine):
+    # Operations to reverse the above upgrade go here.
+    pre_meta.bind = migrate_engine
+    post_meta.bind = migrate_engine
+    post_meta.tables['post'].drop()

tmp/add_user.py

@@ -0,0 +1,49 @@
+from app import db, models
+'''
+u = models.User(nickname='Scott', email='[email protected]')
+db.session.add(u)
+db.session.commit()
+
+u = models.User(nickname='Lucine', email='[email protected]')
+db.session.add(u)
+db.session.commit()
+
+users = models.User.query.all()
+print(users)
+
+u = models.User.query.get(1)
+print(u)
+
+import datetime
+u = models.User.query.get(1)
+p = models.Post(body='my first post!', timestamp=datetime.datetime.utcnow(), author=u)
+db.session.add(p)
+db.session.commit()
+
+# get all posts from a user
+u = models.User.query.get(1)
+print(u)
+posts = u.posts.all()
+print(posts)
+
+# obtain author of each post
+for p in posts:
+    print(p.id,p.author.nickname,p.body)
+
+# a user that has no posts
+u = models.User.query.get(2)
+print(u)
+print(u.posts.all())
+
+# get all users in reverse alphabetical order
+print(models.User.query.order_by('nickname desc').all())
+'''
+
+
+users = models.User.query.all()
+for u in users:
+    db.session.delete(u)
+posts = models.Post.query.all()
+for p in posts:
+    db.session.delete(p)
+db.session.commit()