Forms

Unit-01/07-sql-alchemy-2/users-messages-forms/app.py

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+from flask import Flask, request, redirect, render_template, url_for
+from flask_sqlalchemy import SQLAlchemy
+from flask_modus import Modus
+from forms import UserForm, MessageForm, DeleteForm
+import os
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = "postgres://localhost/users-messages"
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+app.config['SECRET KEY'] = os.environ.get('SECRET_KEY')
+modus = Modus(app)
+db = SQLAlchemy(app)
+
+class User(db.Model):
+
+	__tablename__ = "users"
+
+	id = db.Column(db.Integer, primary_key=True)
+	first_name = db.Column(db.Text)
+	last_name = db.Column(db.Text)
+	messages = db.relationship('Message', backref="user", lazy="dynamic")
+
+	def __init__(self, first_name, last_name):
+		self.first_name = first_name
+		self.last_name =  last_name
+
+class Message(db.Model):
+
+	__tablename__ = "messages"
+
+	id = db.Column(db.Integer, primary_key=True)
+	content = db.Column(db.Text)
+	user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
+
+	def __init__(self, content, user_id):
+		self.content = content
+		self.user_id = user_id
+
+@app.route('/')
+def root():
+	return redirect(url_for('index'))
+
+@app.route('/users', methods=["GET", "POST"])
+def index():
+  delete_form = DeleteForm()
+  if request.method == "POST":
+  	form = UserForm(request.form)
+  	if form.validate():
+  	 new_user = User(request.form['first_name'], request.form['last_name'])
+  	 db.session.add(new_user)
+  	 db.session.commit()
+  	return redirect(url_for('index'))
+  else:
+  	return render_template('users/new.html', form=form)
+  return render_template('users/index.html', users=User.query.all(), delete_form=delete_form)
+
+@app.route('/users/new')
+def new():
+	user_form = UserForm()
+	return render_template('users/new.html', form=user_form)
+
+@app.route('/users/<int:id>/edit')
+def edit(id):
+	found_user = User.query.get(id)
+	user_form = UserForm(obj=found_user)
+	return render_template('users/edit.html', user=found_user, form=user_form)
+
+@app.route('/users/<int:id>', methods=["GET", "PATCH", "DELETE"])
+def show(id):
+  found_user = User.query.get(id)
+  if request.method == b"PATCH":
+	form = UserForm(request.form)
+	if form.validate():
+	  found_user.first_name = form.first_name.data
+	  found_user.last_name = form.last_name.data
+	  db.session.add(found_user)
+	  db.session.commit()
+	  return redirect(url_for('index'))
+	return render_template('users/edit.html', user=found_user, form=form)
+   if request.method == b"DELETE":
+	  delete_form = DeleteForm(request.form)
+	  if delete_form.validate():
+	    db.session.delete(found_user)
+	    db.session.commit()
+	    return redirect(url_for('index'))
+	return render_template('users/show.html', user=found_user)
+
+@app.route('/users/<int:user_id>/messages', methods=["GET", "POST"])
+def messages_index(user_id):
+  if request.method == "POST":
+  	new_message = Message(request.form['content'], user_id)
+  	db.session.add(new_message)
+  	db.session.commit()
+  	return redirect(url_for('messages_index', user_id=user_id))
+  return render_template('messages/index.html', user=User.query.get(user_id))
+
+@app.route('/users/<int:user_id>/messages/new', methods=["GET", "POST"])
+def messages_new(user_id):
+   return render_template('messages/new.html', user=User.query.get(user_id))
+
+@app.route('/users/<int:user_id>/messages/<int:id>/edit', methods=["GET", "POST"])
+def messages_edit(user_id, id):
+	found_message = Message.query.get(id)
+	return render_template('messages/edit.html', message=found_message)
+
+
+@app.route('/users/<int:user_id>/messages/<int:id>', methods=["GET", "PATCH", "DELETE"])
+def messages_show(user_id, id):
+	found_message = Message.query.get(id)
+	if request.method == b"PATCH":
+		found_message.content = request.form['content']
+		db.session.add(found_message)
+		db.session.commit()
+		return redirect(url_for('messages_index', user_id=user_id))
+	if request.method == b"DELETE":
+		db.session.delete(found_message)
+		db.session.commit()
+		return redirect(url_for('messages_index', user_id=user_id))
+	return render_template('messages/show.html', message=found_message)
+
+
+
+if __name__ == '__main__':
+	app.run(debug=True, port=3000)
+
+
+

Unit-01/07-sql-alchemy-2/users-messages-forms/forms.py

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+from flask_wtf import FlaskForm
+from wtforms import StringField, validators
+
+class UserForm(FlaskForm):
+	first_name = StringField('First Name', [validators.DataRequired()])
+	last_name = StringField('Last Name', [validators.DataRequired()])
+
+class MessageForm(FlaskForm):
+	content = StringField('Content', [validators.DataRequired])
+
+class DeleteForm(FlaskForm):
+	pass

Unit-01/07-sql-alchemy-2/users-messages-forms/manage.py

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+from app import app, db
+
+from flask_script import Manager
+from flask_migrate import Migrate, MigrateCommand
+
+migrate = Migrate(app, db)
+manager = Manager(app)
+
+manager.add_command('db', MigrateCommand)
+
+if __name__ == '__main__':
+	manager.run()

Unit-01/07-sql-alchemy-2/users-messages-forms/migrations/README

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+Generic single-database configuration.

Unit-01/07-sql-alchemy-2/users-messages-forms/migrations/alembic.ini

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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
+
+[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

Unit-01/07-sql-alchemy-2/users-messages-forms/migrations/env.py

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+from __future__ import with_statement
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+from logging.config import fileConfig
+import logging
+
+# 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'))
+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)
+
+    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.')
+
+    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,
+                      process_revision_directives=process_revision_directives,
+                      **current_app.extensions['migrate'].configure_args)
+
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

Unit-01/07-sql-alchemy-2/users-messages-forms/migrations/script.py.mako

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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"}

Unit-01/07-sql-alchemy-2/users-messages-forms/migrations/versions/10ea5e18414a_adding_users_table.py

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+"""adding users table
+
+Revision ID: 10ea5e18414a
+Revises: 
+Create Date: 2017-11-30 14:09:26.373494
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '10ea5e18414a'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('first_name', sa.Text(), nullable=True),
+    sa.Column('last_name', sa.Text(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('users')
+    # ### end Alembic commands ###

Unit-01/07-sql-alchemy-2/users-messages-forms/migrations/versions/bcb5d2e5decd_adding_messages_table.py

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+"""adding messages table
+
+Revision ID: bcb5d2e5decd
+Revises: 10ea5e18414a
+Create Date: 2017-11-30 18:07:25.906299
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'bcb5d2e5decd'
+down_revision = '10ea5e18414a'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('messages',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('content', sa.Text(), nullable=True),
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('messages')
+    # ### end Alembic commands ###

Unit-01/07-sql-alchemy-2/users-messages-forms/templates/base.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<title>Document</title>
+</head>
+<body>
+	{% block content %}
+	{% endblock %}
+</body>
+</html>