Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Build a Social Network with Flask How to Win Friends Follow/Unfollow views

Josh Keenan
Josh Keenan
20,315 Points

follow view

Can't see the problem, I will include another attempt I made as well:

try:
        to_user = models.User.get(models.User.user_id**user_id)#case insensitve search **
  except models.DoesNotExist:
        pass
  else:
        try:
            models.Relationship.create(
                from_user=g.user._get_current_object(),
                to_user=to_user
            )

        except models.IntegrityError:
            pass
        else:
            flash("You've followed {}!".format(to_user.user_id), "success")
  return redirect(url_for('index'))
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'


@app.route('/follow/<int:user_id>')
@login_required
def follow(user_id):
    models.Relationship.create(
      from_user=g.user._get_current_object(),
      to_user=models.User.get(models.User.user_id)
    )

    return redirect(url_for('index'))


@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'))

4 Answers

Bart Bruneel
Bart Bruneel
27,212 Points

So here's the code that passes for me.

@app.route("/follow/<int:user_id>")
@login_required
def follow(user_id):
  try:
        to_user = models.User.get(models.User.id**user_id)#case insensitve search **
  except models.DoesNotExist:
        pass
  else:
        try:
            models.Relationship.create(
                from_user=g.user._get_current_object(),
                to_user=to_user
            )

        except models.IntegrityError:
            pass
        else:
            flash("You've followed {}!".format(to_user.id), "success")
  return redirect(url_for('index'))

This was a bit of crock...

Why does the flash message have to be "to_user.id shouldn't it be "to_user.username"

Than hung me up for an hour...

flash("You've followed {}!".format(to_user.id), "success") # works

flash("You've followed {}!".format(to_user.username), "success") #fails..

pretty damn picky and wrong if you ask me.

Bart Bruneel
Bart Bruneel
27,212 Points

Hello Josh,

Your first attempt is more or less ok if you add the

@app.route('/follow/<int:user_id>')
@login_required
def follow(user_id):

to the beginning. The only other thing that is wrong about your solution is that the id-attribute of the User-model is not called user_id but just id. So you will have to change user_id to id in the line where you create the to_user and in the line where you flash the message.

Josh Keenan
Josh Keenan
20,315 Points

Nearly, but it doesn't create a relationship..

Josh Keenan
Josh Keenan
20,315 Points

It's because in the scenario instead of a username attribute there was a user id attribute, so if you search for a username, it can't find one as it doesn't exist