flask-flashy

Custom flash system allowing custom keyword arguments for Flask.

How it works

Flask's default flash() function simply takes two strings and passes them into the session (the message and category, eg flash('Username Is In Use', 'warning')), which is then obtained and cleared by get_flashed_messages() in jinja.

flask-flashy uses a keyword-based flashing system, allowing you to pass in as many keyword arguments as you'd like, while still keeping the default message and category to align with flask and allow for minimal edits to convert (eg flash('Username Is In Use. Login Instead?', 'warning', url=url_for('login'), timestamp=datetime.now() )).

Installation & Basic Usage

Install via pip:

pip install flask-flashy

After installing, wrap your Flask app with flashy...

from flask import Flask, render_template
from flask_flashy import Flashy, flash

app = Flask(__name__)
flashy = Flashy(app)

@app.route("/")
def index():
  flash('Hello flashy!')
  return render_template('index.html')

...or using the application factory pattern.

from flask import Flask
from flask_flashy import Flashy

flashy = Flashy()

def create_app():
    app = Flask(__name__)
    flashy.init_app(app)
    return app

NOTE: Flashy must be initialized in order to create the context processor which allows get_flashy_messages() to be used in jinja templates.

Examples

After initializing the app, simply call for a flash in a route, passing in the message, optionally a second string as a category (will default to 'message' if not provided), and as many custom keyword arguments as you'd like.

@app.route('/')
def index():
  flash('Woah there partner!', 'danger', url='https://example.com/')
  return render_template('index.html')

Then get the flashes in the template using jinja:

{% with messages = get_flashy_messages() %}
{% if messages %}
<ul>
{% for message in messages %}
{% if message.url %}
<a href="{{ message.url }}"><li class="{{ message.category }}">{{ message.message }}</li></a>
{% else %}
<li class="{{ message.category }}">{{ message.message }}</li>
{% endif %}
{% endfor %}
</ul>
{% endif %}
{% endwith %}

NOTE: Yes, gone are the days of having to specify with_categories=True, it passes everything automatically.

And style and use to your hearts content.

Don't like flashy taking over the flash() function? Want to use both the flash and flashy systems in the same project (for whatever reason)? Simply import it with a custom name, such as...

from flask-flashy import flash as flashyFlash

TODO

• Category sorting like vanilla flask
• Fun flask-like logo
• ???

Release History

• 0.2.2 - Hotfix, get_flashed_messages() was clearing the list before returning them resulting in an error.
• 0.2.1 - Fixed JSON serialization bug, now stores the flash directly as a dict, and converts into a FlashyMessage once retrieved.
• 0.2.0 - Made flash() and get_flashed_messages() their own functions rather than methods within Flashy, and more verbose docstrings.
• 0.1.0 - Initial release on pypi.