Flask - Routes dynamic component

1. Route: Set url as 'user/<username>'

• When a route has a dynamic component, Flask will accept any text in that portion of the URL, and will invoke the view function with the actual text as an argument.

2. Function: Use first_or_404

• filter_by(username=username) this user name is given by URL ! (wow)
• if user is not founded, raise 404 error

@app.route('/user/<username>') # dynamic component
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404() # if user is not founded, raise 404 error page
                                # the username receive from routes
    posts = [
        {'author': user, 'body': 'Test post #1'},
        {'author': user, 'body': 'Test post #2'}
    ]
    return render_template('user.html', user=user, posts=posts)

####3. View - To access the profile page

• To access the user/<username>, when set url_for, need to give username argument.
• so, get current_user’s username, and passing the value as an argument.

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