Flask Tips

Flask Message Flashing - get_flashed_messages()

In Flask, the get_flashed_messages() method is used to retrieve all the flash messages (from the session).

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<!-- flash messages --> {% for message in get_flashed_messages() %}  <p>{{ message }}</p> {% endfor %}

Message Flashing

Flash messages are used to provide useful information to the user based on their actions with the app. The flash() method is used to create a flash message to be displayed in the next request.

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from flask import request, redirect, url_for, render_template, flash @stocks_blueprint.route('/add_stock', methods=['GET', 'POST']) def add_stock():    if request.method == 'POST':        # ... save the data ...        flash(f"Added new stock ({stock_data.stock_symbol})!")  # <-- !!        return redirect(url_for('stocks.list_stocks'))    return render_template('stocks/add_stock.html')

Flask Redirect

In Flask, the redirect() function is used to redirect a user to a different URL.

redirect() can greatly improve the navigation through a site by automatically redirecting users to their expected pages.

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@app.route('/add_stock', methods=['GET', 'POST'])
def add_stock():
   if request.method == 'POST':
       # ... save the data ...

       return redirect(url_for('list_stocks'))  # <-- !!

   return render_template('add_stock.html')