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Python A Social Network with Flask How to Win Friends Lunch Count

Andy Hughes
Andy Hughes
8,113 Points

lunch count challenge task

If this helps anyone else, you're welcome :). First things first, don't bother watching the video directly before this challenge, it's entirely irrelevant! It's the video before the previous challenge that's relevant. I think it's "follow and unfollow buttons" video. In that video it shows you roughly what to do, however, it's not exactly the same.

2 Tips

1) followers() is actually a function call, but we've already created a decorater to be able to use the function without calling it. (At least I think I've explained that correctly).

2) Watch the video as mentioned above, it's near the beginning of the video, where he demonstrates the code almost exactly.

3) My code is below, so don't scroll if you want to figure it out on your own. :)

lunch.py
import datetime

from flask import Flask, g, render_template, flash, redirect, url_for
from flask.ext.bcrypt import check_password_hash
from flask.ext.login import LoginManager, login_user, current_user, login_required, logout_user

import forms
import models

app = Flask(__name__)
app.secret_key = 'this is our super secret key. do not share it with anyone!'
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'


@login_manager.user_loader
def load_user(userid):
    try:
        return models.User.select().where(
            models.User.id == int(userid)
        ).get()
    except models.DoesNotExist:
        return None


@app.before_request
def before_request():
    g.db = models.DATABASE
    g.db.connect()
    g.user = current_user


@app.after_request
def after_request(response):
    g.db.close()
    return response


@app.route('/register', methods=('GET', 'POST'))
def register():
    form = forms.SignUpInForm()
    if form.validate_on_submit():
        models.User.new(
            email=form.email.data,
            password=form.password.data
        )
        flash("Thanks for registering!") 
    return render_template('register.html', form=form)


@app.route('/login', methods=('GET', 'POST'))
def login():
    form = forms.SignUpInForm()
    if form.validate_on_submit():
        try:
            user = models.User.get(
                models.User.email == form.email.data
            )
            if check_password_hash(user.password, form.password.data):
                login_user(user)
                flash("You're now logged in!")
            else:
                flash("No user with that email/password combo")
        except models.DoesNotExist:
              flash("No user with that email/password combo")
    return render_template('register.html', form=form)

@app.route('/secret')
@login_required
def secret():
    return "I should only be visible to logged-in users"

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('login'))


@app.route('/')
def index():
    return render_template('index.html')


@app.route('/order', methods=('GET', 'POST'))
def order_lunch():
    form = forms.LunchOrderForm()
    if form.validate_on_submit():
        models.LunchOrder.create(
            user=g.user._get_current_object(),
            date=form.date.data,
            order=form.order.data.strip()
        )
    return render_template('lunch.html', form=form)


@app.route('/today')
@login_required
def today():
    order = models.LunchOrder.select().where(
        models.LunchOrder.date == datetime.date.today() &
        models.LunchOrder.user == g.user._get_current_object()
    ).get()
    return render_template('today.html', order=order)


@app.route('/cancel_order/<int:order_id>')
@login_required
def cancel_order(order_id):
    try:
        order = models.LunchOrder.select().where(
            id=order_id,
            user=g.user._get_current_object()
        ).get()
    except models.DoesNotExist:
        pass
    else:
        order.delete_instance()
    return redirect(url_for('index'))


@app.route('/follow/<int:user_id>')
@login_required
def follow(user_id):
    try:
        user = models.User.get(
            models.User.id == user_id
        )
        models.Relationship.create(
            from_user=g.user._get_current_object(),
            to_user=user
        )
    except (models.DoesNotExist, models.IntegrityError):
        pass
    return redirect(url_for('index'))


@app.route('/unfollow/<int:user_id>')
@login_required
def unfollow(user_id):
    try:
        user = models.User.get(
            models.User.id == user_id
        )
        models.Relationship.get(
            models.Relationship.from_user==g.user._get_current_object(),
            models.Relationship.to_user==user
        ).delete_instance()
    except (models.DoesNotExist, models.IntegrityError):
        pass
    return redirect(url_for('index'))


@app.route('/profile/<int:user_id>')
def profile(user_id):
    user = models.User.select().where(
        models.User.id == user_id
    ).get()
    return render_template('profile.html', user=user)
models.py
import datetime

from flask.ext.bcrypt import generate_password_hash
from flask.ext.login import UserMixin
from peewee import *

DATABASE = SqliteDatabase(':memory:')


class User(UserMixin, Model):
    email = CharField(unique=True)
    password = CharField(max_length=100)
    join_date = DateTimeField(default=datetime.datetime.now)
    bio = CharField(default='')

    class Meta:
        database = DATABASE

    @property
    def following(self):
        return (
            User
            .select()
            .join(Relationship, on=Relationship.to_user)
            .where(Relationship.from_user == self)
        )

    @property
    def followers(self):
        return (
            User
            .select()
            .join(Relationship, on=Relationship.from_user)
            .where(Relationship.to_user == self)
        )


    @classmethod
    def new(cls, email, password):
        cls.create(
            email=email,
            password=generate_password_hash(password)
        )


class LunchOrder(Model):
    order = TextField()
    date = DateField()
    user = ForeignKeyField(User, related_name="orders")


class Relationship(Model):
    from_user = ForeignKeyField(User, related_name="relationships")
    to_user = ForeignKeyField(User, related_name="related_to")
    created_at = DateTimeField(default=datetime.datetime.now)

    class Meta:
        database = DATABASE
        indexes = (
            (('from_user', 'to_user'), True),
        )


def initialize():
    DATABASE.connect()
    DATABASE.create_tables([User, LunchOrder], safe=True)
    DATABASE.close()
templates/profile.html
{% extends "layout.html" %}
{% from "macro.html" import hide_email %}

{% block content %}

<h1>{{ hide_email(user) }}</h1>

<dl>
    <dt>Lunches:</dt>
    <dd>{{ user.orders.count() }}</dd>
    <dt>Followers:</dt>
    <dd>{{ user.followers.count() }}</dd>
    <dt>Following:</dt>
    <dd>{{ user.following.count() }}</dd>
</dl>

{% endblock %}