initial version

.gitignore

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+*.pyc
+app.db
+.idea

README

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+Basic Flask
+===========
+
+This sample project shows how I organize a project to use Flask,
+Flask-SQLAlchemy, and Alembic together.  It demonstrates the application
+factory pattern and is organized using blueprints.
+
+Demonstrating migration generation
+----------------------------------
+
+I used Alembic to autogenerate a migration and then tweaked the results.  If you
+want to see autogeneration in action, just delete
+`alembic/versions/35b593d48d6a_user_models.py`, then run
+`alembic revision --autogenerate -m "user models"`.
+
+Set up the database
+-------------------
+
+Change `basic_app.config.SQLALCHEMY_DATABASE_URI` to what you want.  By default
+it points to a sqlite file called `app.db` in the project folder.
+
+Then run `alembic upgrade head` to set up the database through migrations.
+
+Or, permform the following from a Python shell.
+
+    In [1]: from basic_app import create_app, db
+    In [2]: create_app().app_context().push()
+    In [3]: db.create_all()
+
+Then run `alembic stamp head` to mark migrations as current.
+
+Origin
+------
+
+Created in answer to this question on /r/flask and StackOverflow:
+
+* [\[AF\] Has anyone ever gotten Alembic to work with Flask Blueprints? \[SQLAlchemy\]](http://www.reddit.com/r/flask/comments/1h1k5g/af_has_anyone_ever_gotten_alembic_to_work_with/)
+* [Alembic autogenerates empty Flask-SQLAlchemy migrations](http://stackoverflow.com/questions/17201800/alembic-autogenerates-empty-flask-sqlalchemy-migrations)

alembic.ini

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+[alembic]
+script_location = alembic
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

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+from logging.config import fileConfig
+import os
+import sys
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+sys.path.append(os.getcwd())
+
+from basic_app import db, create_app
+
+config = context.config
+
+fileConfig(config.config_file_name)
+
+app = create_app()
+config.set_main_option("sqlalchemy.url", app.config["SQLALCHEMY_DATABASE_URI"])
+
+target_metadata = db.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(url=url)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    engine = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix='sqlalchemy.',
+        poolclass=pool.NullPool
+    )
+    connection = engine.connect()
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+"""
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

alembic/versions/35b593d48d6a_user_models.py

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+"""user models
+
+Revision ID: 35b593d48d6a
+Revises: None
+Create Date: 2013-06-25 10:10:53.866281
+"""
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.sql import expression
+
+# revision identifiers, used by Alembic.
+revision = "35b593d48d6a"
+down_revision = None
+
+
+def upgrade():
+    op.create_table("group",
+        sa.Column("id", sa.Integer, primary_key=True),
+        sa.Column("name", sa.String(100), nullable=False, unique=True, index=True)
+    )
+    op.create_table("user",
+        sa.Column("id", sa.Integer),
+        sa.Column("username", sa.String(254), nullable=False, unique=True, index=True),
+        sa.Column("password", sa.String(60)),
+        sa.Column("name", sa.String(254), nullable=False, server_default=""),
+        sa.Column("email", sa.String(254), nullable=False, server_default=""),
+        sa.Column("active", sa.Boolean, nullable=False, server_default=expression.true()),
+        sa.PrimaryKeyConstraint("id")
+    )
+    op.create_table("user_group",
+        sa.Column("user_id", sa.Integer, sa.ForeignKey("user.id"), primary_key=True),
+        sa.Column("group_id", sa.Integer, sa.ForeignKey("group.id"), primary_key=True),
+    )
+
+
+def downgrade():
+    op.drop_table("user_group")
+    op.drop_table("user")
+    op.drop_table("group")

basic_app/__init__.py

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+from flask import Flask
+from flask.ext.script import Manager
+from flask.ext.sqlalchemy import SQLAlchemy
+from basic_app import config
+
+db = SQLAlchemy()
+
+
+def load_models():
+    from basic_app.auth import models
+
+load_models()
+
+
+def init_extensions(app):
+    db.init_app(app)
+
+
+def init_views(app):
+    from basic_app import auth
+
+    app.register_blueprint(auth.bp, url_prefix="/auth")
+
+
+def create_app(config=config):
+    app = Flask(__name__)
+    app.config.from_object(config)
+
+    init_extensions(app)
+
+    return app
+
+manager = Manager(create_app)

basic_app/auth/__init__.py

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+from flask import Blueprint
+
+bp = Blueprint("auth", __name__, template_folder="templates")
+
+from basic_app.auth import views

basic_app/auth/models.py

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+from sqlalchemy.sql import expression
+from basic_app import db
+
+
+class Group(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(100), nullable=False, unique=True, index=True)
+
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(254), nullable=False, unique=True, index=True)
+    password = db.Column(db.String(60))
+    name = db.Column(db.String(254), nullable=False, default="", server_default="")
+    email = db.Column(db.String(254), nullable=False, default="", server_default="")
+    active = db.Column(db.Boolean, nullable=False, default=False, server_default=expression.true())
+
+    groups = db.relationship(Group, lambda: user_group, backref=db.backref("users"))
+
+user_group = db.Table("user_group",
+    db.Column("user_id", db.Integer, db.ForeignKey(User.id), primary_key=True),
+    db.Column("group_id", db.Integer, db.ForeignKey(Group.id), primary_key=True)
+)

basic_app/auth/views.py

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+from basic_app.auth import bp
+from basic_app.auth.models import User
+
+
+@bp.route("/<username>")
+def hello(username):
+    u = User.query.filter_by(username=username).first_or_404()
+    return "Hello, {}!".format(u.username)

basic_app/config.py

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+DEBUG = True
+SECRET_KEY = "dev"
+
+SQLALCHEMY_DATABASE_URI = "sqlite:///app.db"

manage.py

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+from basic_app import manager
+
+manager.run()

requirements.txt

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+Flask-Script
+Flask-SQLAlchemy
+alembic