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Chapter 4

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Ricardo Montañana Gómez
2023-06-03 16:59:29 +02:00
parent c640e3ca82
commit f9020e921f
16 changed files with 396 additions and 0 deletions
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.vscode/settings.json vendored Normal file
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{
"[python]": {
"editor.defaultFormatter": "ms-python.black-formatter"
},
"python.formatting.provider": "none"
}

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app/__init__.py Normal file
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from flask import Flask
from config import Config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
app = Flask(__name__)
app.config.from_object(Config)
# Puestos fuera del tutorial
app.jinja_env.auto_reload = True
app.config["TEMPLATES_AUTO_RELOAD"] = True
db = SQLAlchemy(app)
migrate = Migrate(app, db)
from app import routes, models

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app/forms.py Normal file
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from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired
class LoginForm(FlaskForm):
username = StringField("Username", validators=[DataRequired()])
password = PasswordField("Password", validators=[DataRequired()])
remember_me = BooleanField("Remember Me")
submit = SubmitField("Sign In")

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app/models.py Normal file
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from datetime import datetime
from app import db
class User(db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(64), index=True, unique=True)
email = db.Column(db.String(120), index=True, unique=True)
password_hash = db.Column(db.String(128))
posts = db.relationship("Post", backref="author", lazy="dynamic")
def __repr__(self):
return "<User {}>".format(self.username)
class Post(db.Model):
id = db.Column(db.Integer, primary_key=True)
body = db.Column(db.String(140))
timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
user_id = db.Column(db.Integer, db.ForeignKey("user.id"))
def __repr__(self):
return "<Post {}>".format(self.body)

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app/routes.py Normal file
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from flask import render_template, flash, redirect, url_for
from app import app
from app.forms import LoginForm
@app.route("/")
@app.route("/index")
def index():
user = {"username": "Miguel"}
posts = [
{"author": {"username": "John"}, "body": "Beautiful day in Portland!"},
{"author": {"username": "Susan"}, "body": "The Avengers movie was so cool!"},
]
return render_template("index.html", title="Home", user=user, posts=posts)
@app.route("/login", methods=["GET", "POST"])
def login():
form = LoginForm()
if form.validate_on_submit():
flash(
"Login requested for user {}, remember_me={}".format(
form.username.data, form.remember_me.data
)
)
return redirect(url_for("index"))
return render_template("login.html", title="Sign In", form=form)

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app/templates/base.html Normal file
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<html>
<head>
{% if title %}
<title>{{ title }} - microblog</title>
{% else %}
<title>microblog</title>
{% endif %}
</head>
<body>
<div>
Microblog:
<a href="{{ url_for('index') }}">Home</a>
<a href="{{ url_for('login') }}">Login</a>
</div>
<hr />
{% with messages = get_flashed_messages() %}
{% if messages %}
<ul>
{% for message in messages %}
<li>{{ message }}</li>
{% endfor %}
</ul>
{% endif %}
{% endwith %}
{% block content %}
{% endblock %}
</body>
</html>

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app/templates/index.html Normal file
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{% extends "base.html" %}
{% block content %}
<h1>Hi, {{ user.username }}!</h1>
{% for post in posts %}
<div><p>{{ post.author.username }} says: <b>{{ post.body }}</b></p></div>
{% endfor %}
{% endblock %}

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app/templates/login.html Normal file
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{% extends 'base.html' %}
{% block content %}
<h1>Sign In</h1>
<form action="" method="post" novalidate>
{{ form.hidden_tag() }}
<p>
{{ form.username.label }}<br />
{{ form.username(size = 32) }}<br />
{% for error in form.username.errors %}
<span style="color: red;">[{{ error }}]</span>
{% endfor %}
</p>
<p>
{{ form.password.label }}<br />
{{ form.password(size = 32) }}<br />
{% for error in form.password.errors %}
<span style="color: red;">[{{ error }}]</span>
{% endfor %}
</p>
<p>{{ form.remember_me() }} {{ form.remember_me.label }}</p>
<p>{{ form.submit() }}</p>
</form>
{% endblock %}

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config.py Normal file
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import os
basedir = os.path.abspath(os.path.dirname(__file__))
class Config(object):
SECRET_KEY = os.environ.get("SECRET_KEY") or "you-will-never-guess"
SQLALCHEMY_DATABASE_URI = os.environ.get(
"DATABASE_URL"
) or "sqlite:///" + os.path.join(basedir, "app.db")
SQLALCHEMY_TRACK_MODIFICATIONS = False

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microblog.py Normal file
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from app import app

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migrations/README Normal file
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Single-database configuration for Flask.

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migrations/alembic.ini Normal file
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# 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,flask_migrate
[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
[logger_flask_migrate]
level = INFO
handlers =
qualname = flask_migrate
[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

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migrations/env.py Normal file
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import logging
from logging.config import fileConfig
from flask import current_app
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')
def get_engine():
try:
# this works with Flask-SQLAlchemy<3 and Alchemical
return current_app.extensions['migrate'].db.get_engine()
except TypeError:
# this works with Flask-SQLAlchemy>=3
return current_app.extensions['migrate'].db.engine
def get_engine_url():
try:
return get_engine().url.render_as_string(hide_password=False).replace(
'%', '%%')
except AttributeError:
return str(get_engine().url).replace('%', '%%')
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
config.set_main_option('sqlalchemy.url', get_engine_url())
target_db = current_app.extensions['migrate'].db
# 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 get_metadata():
if hasattr(target_db, 'metadatas'):
return target_db.metadatas[None]
return target_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, target_metadata=get_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 = get_engine()
with connectable.connect() as connection:
context.configure(
connection=connection,
target_metadata=get_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()

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migrations/script.py.mako Normal file
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"""${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"}

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migrations/versions/d56801750ac8_users_posts.py Normal file
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"""users posts
Revision ID: d56801750ac8
Revises:
Create Date: 2023-06-03 16:52:06.559482
"""
from alembic import op
import sqlalchemy as sa
# revision identifiers, used by Alembic.
revision = 'd56801750ac8'
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('username', sa.String(length=64), nullable=True),
sa.Column('email', sa.String(length=120), nullable=True),
sa.Column('password_hash', sa.String(length=128), nullable=True),
sa.PrimaryKeyConstraint('id')
)
with op.batch_alter_table('user', schema=None) as batch_op:
batch_op.create_index(batch_op.f('ix_user_email'), ['email'], unique=True)
batch_op.create_index(batch_op.f('ix_user_username'), ['username'], unique=True)
op.create_table('post',
sa.Column('id', sa.Integer(), nullable=False),
sa.Column('body', sa.String(length=140), nullable=True),
sa.Column('timestamp', sa.DateTime(), nullable=True),
sa.Column('user_id', sa.Integer(), nullable=True),
sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
sa.PrimaryKeyConstraint('id')
)
with op.batch_alter_table('post', schema=None) as batch_op:
batch_op.create_index(batch_op.f('ix_post_timestamp'), ['timestamp'], unique=False)
# ### end Alembic commands ###
def downgrade():
# ### commands auto generated by Alembic - please adjust! ###
with op.batch_alter_table('post', schema=None) as batch_op:
batch_op.drop_index(batch_op.f('ix_post_timestamp'))
op.drop_table('post')
with op.batch_alter_table('user', schema=None) as batch_op:
batch_op.drop_index(batch_op.f('ix_user_username'))
batch_op.drop_index(batch_op.f('ix_user_email'))
op.drop_table('user')
# ### end Alembic commands ###