Database, Models and Migrations

pymike00 · pymike00 · commit e6c8fbdaaae6 · 2019-05-31T18:50:44.000+02:00
diff --git a/.gitignore b/.gitignore
@@ -4,6 +4,8 @@ __pycache__/
 *.py[cod]
 *$py.class
 
+blog.db
+
 .vscode/
 
 # C extensions
diff --git a/blog/__init__.py b/blog/__init__.py
@@ -1,5 +1,20 @@
 from flask import Flask
 
+from flask_migrate import Migrate
+from flask_sqlalchemy import SQLAlchemy
+
+from config import Config
+
 app = Flask(__name__)
+app.config.from_object(Config)
+
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)
+
+with app.app_context():
+    if db.engine.url.drivername == 'sqlite':
+        migrate.init_app(app, db, render_as_batch=True)
+    else:
+        migrate.init_app(app, db)
 
-from blog import routes
+from blog import models, routes
diff --git a/blog/models.py b/blog/models.py
@@ -0,0 +1,21 @@
+from datetime import datetime
+
+from blog import db
+
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    created_at = db.Column(db.DateTime, default=datetime.now)
+    username = db.Column(db.String(12), unique=True, nullable=False)
+    email = db.Column(db.String(50), unique=True, nullable=False)
+    password = db.Column(db.String(250), nullable=False)
+    posts = db.relationship('Post', backref='author', lazy='dynamic')
+
+
+class Post(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
+    created_at = db.Column(db.DateTime, default=datetime.now)
+    title = db.Column(db.String(120), nullable=False)
+    description = db.Column(db.String(240))
+    body = db.Column(db.Text(), nullable=False)
diff --git a/config.py b/config.py
@@ -0,0 +1,8 @@
+import os
+
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+
+class Config:
+    SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'blog.db')
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
diff --git a/migrations/README b/migrations/README
@@ -0,0 +1 @@
+Generic single-database configuration.
diff --git a/migrations/alembic.ini b/migrations/alembic.ini
@@ -0,0 +1,45 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[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
diff --git a/migrations/env.py b/migrations/env.py
@@ -0,0 +1,96 @@
+from __future__ import with_statement
+
+import logging
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+from flask import current_app
+config.set_main_option(
+    'sqlalchemy.url', current_app.config.get(
+        'SQLALCHEMY_DATABASE_URI').replace('%', '%%'))
+target_metadata = current_app.extensions['migrate'].db.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+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, target_metadata=target_metadata, literal_binds=True
+    )
+
+    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.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix='sqlalchemy.',
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            process_revision_directives=process_revision_directives,
+            **current_app.extensions['migrate'].configure_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
diff --git a/migrations/script.py.mako b/migrations/script.py.mako
@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+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)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}
diff --git a/migrations/versions/4fd5c8b52471_creazione_tabelle_post_e_user.py b/migrations/versions/4fd5c8b52471_creazione_tabelle_post_e_user.py
@@ -0,0 +1,48 @@
+"""Creazione Tabelle Post e User
+
+Revision ID: 4fd5c8b52471
+Revises: 
+Create Date: 2019-05-31 17:59:59.229407
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '4fd5c8b52471'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('user',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('username', sa.String(length=12), nullable=False),
+    sa.Column('email', sa.String(length=50), nullable=False),
+    sa.Column('password', sa.String(length=250), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('email'),
+    sa.UniqueConstraint('username')
+    )
+    op.create_table('post',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('user_id', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('title', sa.String(length=120), nullable=False),
+    sa.Column('description', sa.String(length=240), nullable=True),
+    sa.Column('body', sa.Text(), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('post')
+    op.drop_table('user')
+    # ### end Alembic commands ###
diff --git a/requirements.txt b/requirements.txt
@@ -1,7 +1,15 @@
+alembic==1.0.10
 Click==7.0
 Flask==1.0.3
+Flask-Migrate==2.5.2
+Flask-SQLAlchemy==2.4.0
 itsdangerous==1.1.0
 Jinja2==2.10.1
+Mako==1.0.10
 MarkupSafe==1.1.1
+python-dateutil==2.8.0
 python-dotenv==0.10.2
+python-editor==1.0.4
+six==1.12.0
+SQLAlchemy==1.3.4
 Werkzeug==0.15.4
