Mastering Flask Web Development - Second Edition

Creating a reminder app

Let's get into some real-world example applications of Celery. Suppose another page on our site now requires a reminders feature. Users can create reminders that will send an email to a specified location at a specified time. We will need a model, a task, and a way to call our task automatically every time a model is created.

Let's start with the following basic SQLAlchemy model:

class Reminder(db.Model): 
    id = db.Column(db.Integer(), primary_key=True) 
    date = db.Column(db.DateTime()) 
    email = db.Column(db.String()) 
    text = db.Column(db.Text()) 
      def __repr__(self): 
        return "<Reminder '{}'>".format(self.text[:20]) 

Now, we need a task that will send an email to the location in the model. In our blog/tasks.py file, look up ...