Jette sql alchemy ii

Unit-01/07-sql-alchemy-2/app.py

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+from flask import Flask, render_template, redirect, url_for, request
+from flask_sqlalchemy import SQLAlchemy #step 1: pip install flask_sqlalchemy psycopg2
+from flask_modus import Modus
+
+
+
+
+app = Flask(__name__)
+#step 2: app.config to cofig to correct database
+app.config['SQLALCHEMY_DATABASE_URI'] = "postgres://localhost/flask-user-app"
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+modus = Modus(app)
+db = SQLAlchemy(app)
+
+
+#set up our table
+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', cascade='all,delete')
+
+    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():
+    if request.method == "POST":
+        new_user = User(request.form['first_name'], request.form['last_name'])  # name from type in new.html#
+        db.session.add(new_user)
+        db.session.commit()
+        return redirect(url_for('index'))
+    return render_template('users/index.html', users=User.query.all())
+
+
+
+@app.route('/users/new')
+def new():
+    return render_template('users/new.html')
+
+@app.route('/users/<int:id>', methods=["GET", "PATCH", "DELETE"])
+def show(id):
+    found_user = User.query.get(id)
+
+    if request.method == b"PATCH":
+        found_user.first_name = request.form['first_name']
+        found_user.last_name = request.form['last_name']
+        db.session.add(found_user)
+        db.session.commit()
+        return redirect(url_for('index'))
+
+
+    if request.method == b"DELETE":
+        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:id>/edit')
+def edit(id):
+    #refactored using a list comprehension
+    found_user = User.query.get(id)
+    return render_template('users/edit.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')
+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>', 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))
+
+    elif 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)
+
+@app.route('/users/<int:user_id>/messages/<int:id>/edit')
+def messages_edit(user_id, id):
+    found_message = Message.query.get(id)
+    user=User.query.get(user_id)
+    return render_template('messages/edit.html', message=found_message, user=user)
+
+
+
+
+
+
+
+if __name__ == '__main__':
+    app.run(debug=True, port=3000)

Unit-01/07-sql-alchemy-2/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) # python manage.py db
+
+if __name__ == '__main__':
+    manager.run()

Unit-01/07-sql-alchemy-2/migrations/README

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+Generic single-database configuration.

Unit-01/07-sql-alchemy-2/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/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/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/migrations/versions/d133f7ee8b3c_.py

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+"""empty message
+
+Revision ID: d133f7ee8b3c
+Revises: 
+Create Date: 2017-12-09 19:11:57.347109
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'd133f7ee8b3c'
+down_revision = None
+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/templates/base.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="X-UA-Compatible" content="ie=edge">
+  <title>Users CRUD App</title>
+  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">      <!-- Optional theme -->     <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap-theme.min.css">
+</head>
+<body>
+  <div class="container">
+
+
+  <a href="{{url_for('index')}}">Home</a>
+  {% block content %}
+  {% endblock %}
+  </div>
+</body>
+</html>

Unit-01/07-sql-alchemy-2/templates/messages/edit.html

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+{% extends "base.html" %}
+{% block content %}
+<h2>Edit Your Message</h2>
+
+<form action="{{url_for('messages_show', user_id=user.id, id=message.id)}}?_method=PATCH" method="POST">
+    <input type="text" name="content" value="{{message.content}}">
+
+    <input type="submit" value="Edit Message">
+</form>
+
+<form action="{{url_for('messages_show', id=message.id, user_id=user.id)}}?_method=DELETE" method="POST">
+  <input type="submit" value="Delete Message">
+
+</form>
+
+{% endblock %}