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--- comb:webapp0 [2014/07/13 14:01]
alfred [First overview]
+++ comb:webapp0 [2020/05/09 09:25] (actual)
@@ Línea 46: / Línea 46: @@
 ===== Model =====
+==== Interact with model classes ====
+Only importing the code file and using the class you will be interacting with the data base:
+<code python>
+from person_app import Person
+from person_app import db
+p = Person(name='Juan', age=33)
+Person.query.all()
+db.session.add(p)
+db.session.commit()
+</code>
 ==== Relationships with SQLAlchemy ====
+=== One to one ===
+<code python>
+class Person(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(50))
+    addresses = db.relationship('Address', backref='person',
+                                lazy='dynamic')
+class Address(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    email = db.Column(db.String(50))
+    person_id = db.Column(db.Integer, db.ForeignKey('person.id'))
+</code>
+=== One to many ===
+<code python>
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(50))
+    addresses = db.relationship('Address',
+        backref=db.backref('person', lazy='joined'), lazy='dynamic')
+</code>
+=== Many to many ===
+<code python>
+tags = db.Table('tags',
+    db.Column('tag_id', db.Integer, db.ForeignKey('tag.id')),
+    db.Column('page_id', db.Integer, db.ForeignKey('page.id'))
+)
+class Page(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    tags = db.relationship('Tag', secondary=tags,
+        backref=db.backref('pages', lazy='dynamic'))
+class Tag(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+</code>
+=== Define fields ===
+<code python>
+class Deck(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.Text, nullable=False)
+    date = db.Column(db.DateTime, default=datetime.now())
+    cards = db.relationship('Card', backref='deck', lazy='dynamic')
+class Card(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    id_deck = db.Column(db.Integer,
+                        db.ForeignKey('deck.id'),
+                        nullable=False)
+    front = db.Column(db.Text)
+    rever = db.Column(db.Text)
+</code>
+=== Separate model in another file ===
+The ''flaskext.sqlalchemy'' module does not have to be initialized with the app right away - you can do this instead:
+<code python>
+# apps.members.models
+from flaskext.sqlalchemy import SQLAlchemy
+db = SQLAlchemy()
+class Member(db.Model):
+    # fields here
+    pass
+</code>
+And then in your application setup you can call init_app:
+<code python>
+# apps.application.py
+from flask import Flask
+from apps.members.models import db
+app = Flask(__name__)
+# later on
+db.init_app(app)
+</code>
+Example:
+<code python>
+# apps.shared.models
+from flaskext.sqlalchemy import SQLAlchemy
+db = SQLAlchemy()
+</code>
+<code python>
+# apps.members.models
+from apps.shared.models import db
+class Member(db.Model):
+    # TODO: Implement this.
+    pass
+</code>
+<code python>
+# apps.reporting.members
+from flask import render_template
+from apps.members.models import Member
+def report_on_members():
+    # TODO: Actually use arguments
+    members = Member.filter(1==1).all()
+    return render_template("report.html", members=members)
+</code>
+<code python>
+# apps.reporting.routes
+from flask import Blueprint
+from apps.reporting.members import report_on_members
+reporting = Blueprint("reporting", __name__)
+reporting.route("/member-report", methods=["GET","POST"])(report_on_members)
+</code>
+<code python>
+# apps.application
+from flask import Flask
+from apps.shared import db
+from apps.reporting.routes import reporting
+app = Flask(__name__)
+db.init_app(app)
+app.register_blueprint(reporting)
+</code>
+Another example:
+<code python>
+app = Flask(__name__, static_path='')
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///digin.db'
+db.init_app(app)
+with app.app_context():
+    db.create_all()
+</code>
+===== HTML and JavaScript =====
+==== Install JS libraries ====
+<code>
+$ sudo apt-get install nodejs
+$ sudo apt-get install npm
+$ sudo npm install -g bower
+$ sudo ln -s /usr/bin/nodejs /usr/bin/node
+Inside the static folder...
+$ bower install angular
+</code>

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