A better solution…. You can use startswith directly in field because field is a python String. {% if field.startswith(‘i-‘) %} More, you can use any String function, including str.endswith(), for example.
In a many to many relationship, the primaryjoin expression describes the join between the left table and the junction table, and the secondaryjoin describes the join between the junction table and the right table. In other words, the primaryjoin expression is saying, “find all rows in the followers table where follower_id is X”, the secondaryjoin … Read more
You are looking for the Optional validator. start = DateField(‘Start Date’, format=”%m/%d/%Y”, validators=(validators.Optional(),))
None of the given answers address flask-sqlalchemy specifically, where you would use exactly the example you gave: Table.query.filter_by(condition).count() You can perform .count() without filters: Table.query.count() You can also count using M2M relationships: ParentTable.children.count() And you can use any of these directly in your jinja templates like: {{ Table.query.filter_by(condition).count() }} Bonus points (for the performance minded): … Read more
People tend to overuse abort(), while in fact it is very simple to generate your own errors. You can write a function that generates custom errors easily, here is one that matches your JSON: def make_error(status_code, sub_code, message, action): response = jsonify({ ‘status’: status_code, ‘sub_code’: sub_code, ‘message’: message, ‘action’: action }) response.status_code = status_code return … Read more
In the flask app I have a function that tries to create a redis client db = redis.Redis(host=”localhost”, port=6379, decode_responses=True) When your flask process runs in a container, localhost refers to the network interface of the container itself. It does not resolve to the network interface of your docker host. So you need to replace … Read more
Base logic: Create reset password form with email field. When user submit form then you should: check this email in database generate undistinguished crypto random secret key (next just secret key) store this key, current timestamp and user identifier to cache or database send it to user email or sms When user apply secret key … Read more
I am running uwsgi version 1.9.5 and the option uwsgi –py-autoreload 1 works great
Important Note Since this question was asked, Sanked Patel gave a talk at PyCon India 2019 about how to fix memory leaks in Flask. This is a summary of his strategy. Minimal Example Suppose you have a simple stateless Flask app with only one endpoint named ‘foo’. Note that the other endpoints ‘memory’ and ‘snapshot’ … Read more
According to the doc: Setting a SERVER_NAME also by default enables URL generation without a request context but with an application context. since you’re using app_context, you may set the SERVER_NAME Configuration Value. By the way, as the doc:Adding a favicon says: <link rel=”shortcut icon” href=”https://stackoverflow.com/questions/31766082/{{ url_for(“static’, filename=”favicon.ico”) }}”> the above line should be enough … Read more