Develop Reference

Flask - User to Profile Relationships

I'm working with Flask-restplus and I am at a point where I would like to associate each User in my user model to a type of profile, where each user can be associated with one or many profile types. I'm wondering how you guys would go about this. So far, here's what I'm thinking/planning to do. NOTE: I'm not very experienced in web development, so there's a chance I don't know the best way to accomplish this.
Step 1: Create a one-to-many (clients need to also be employees, see below) field (profile_types) relating to a static table that just lists all possible profile options. EXAMPLE:
PK PROFILE TYPE
1 provider
2 employee
3 client
.....
The idea here is to track different information and allow for different views/endpoints for users who are tied to certain profile types. Example, employees would provide a valid login authentication and be directed to page A while a client would be directed to page B, etc. We're also planning on collecting different data points within each profile model.
So an instance of a user might look like this, user1.profile == [client, employee'].
NOTE: This is more important for data collection (ie age of employee, start date, etc) than it is for creating directives based on permissions.
Step 2: Upon creating the new user, a signal fires off the creation of a profile based on the profile_types supplied to the user instance. I've used signals with django in the past, is there a signal library for Flask?
Step 3: An empty profile instance(s) now exists for that user. It will be up to a superuser to upload data in bulk or manually fill out profile information.
Is this a sensible way to go about this? My other though is to create a bunch of Boolean fields in the User model is_provider, is_employee, is_client, etc. All fields that are True get assigned a profile instance. What's the best way to go about this?
Thanks everyone!

Seeing that are you try to validate multiple profile types, you may use
if user.profile_type in ['employee', 'client']
Now, if you want to add an super user I think you can use this
if user.profile_type in ['employee', 'client'] and user.profile_type == 'superuser'
Now, you relationship is more like 'many-to-many', because you are saying that an client also needs to be an employee, if you mean that some endpoints needs to be accessible for employees and clients, then you need to use a 'many-to-one' relationship (an Stackoverflow question which explains what is that)
For your instances, there is Flask Marshmallow, which has an amazing compatibility with Flask SQLAlchemy if you are using an database, but Flask Marshmallow can work alone.

django admin application list in readonly

In django-admin, we have 3 rules that we can attribute to a table we can add, modify and delete. When you choose for an user the rule of modify, he can't add and delete.
My problem is that a have list of object and I don't want that the user be able to modify but only choose.
How I can disable it?

It's complicated.
django-admin as the name suggests is intended for admins, who should be able to edit, delete and make new tables.
Maybe this topic will be helpful for you:
https://github.com/lambdalisue/django-permission/issues/67
View permissions in Django

Create an estimator tool in Django Python

I am new to Django. I have read the official documentations and managed to create models in Django. I have a task to create an estimator tool that could provide the estimate(cost) to the user when he selects the hardware/softwares etc. This could be something similar to this http://calculator.s3.amazonaws.com/index.html. This is only for reference but I want to add details dynamically.
Basically I am curious to know about:
How to add rows in Django?
How is the 'Monthly cost' working in amazon calculator?
I want to achieve something similar to this dynamic estimations.
Any pointers/articles/suggestions will be helpful in my learning and analysis.

You have to override the Django admin template for that.
How to add button next to Add User button in Django Admin Site
for auto-selecting the group value you can use
https://github.com/crucialfelix/django-ajax-selects

how to make dynamic field creation capability in openerp module?

Hi I have created an openerp module using Python (eclipse) . I want to add a feature in my form so that admin will be able to create his own fields whenever and whatever he wants . I needed some guidance of how this will be done . As I am new to openerp , any help will be good to me . Thanks
Hopes for advice

I can't think of any easy way of doing this. When OpenERP connects to a database it sets up a registry containing all models and all the fields and as part of this, loads the fields into the database, performs database refactoring etc. The idea is that it is simple to inherit existing models and add your fields that way but it does require coding.
I have done something similar where:
I predefined some fields on your model (field1, intfield1, charfield1 etc.).
Provide a model/form so the admin can say use intfield1 and give it a label of 'My Value'
Override fields_view_get on your model and change the XML to include your field with the correct label.
But this is tricky to get right. You will want to spend some time learning the elementtree module to do the XML manipulation in the fields_view_get.

Improving Performance of Django ForeignKey Fields in Admin

By default, Django's admin renders ForeignKey fields in admin as a select field, listing every record in the foreign table as an option. In one admin-accessible model, I'm referencing the User model as a ForeignKey, and since I have thousands of users Django is populating the select with thousands of options. This is causing the admin page to load incredibly slowly, and the select is not very useful since it can take a while to scroll through thousands of options to find the one you want.
What's the best way to change the rendering of this field in order to improve page load and usability? I'd like the select field to be replaced with some sort of button to launch a search form popup, or a text field that searches keywords via Ajax to find the Id for the specific User they want to associate. Does admin have anything like this builtin, or would I have to write this from scratch?

Add raw_id_fields to your model to only show the ID instead of a dropdown.

You're right, Cerin, the cause of the slowdown is because Django is populating the <select> element with too many options. You might want to use an autocomplete element instead.
Interestingly, Django 2.0 has introduced a new feature on the admin site, called autocomplete_fields, which I think you will find useful in this case. It uses AJAX.
class ExampleAdmin(models.ModelAdmin):
autocomplete_fields = ['example_field_user']

You can use one of the few autocomplete apps for Django. Check them at Django Packages.
There's also django-extensions that have ForeignKeyAutocompleteAdmin that fit your needs pretty well.

Another option is to add readonly_fields instead of raw_id_fields