different data-contract(model) in different layer

[woodson]

we are planning to build large application using Django rest framework . is it possible create different model or data contract ?

• Model
• used to expose outside API data-contracts
• Message Entity
• translate data Model ==> to MessageEntity and carry forward different layer
• DAO
• its march with database table

[Gonzalo Amadio]

You can use DRF to do the exposed API. And then internally, you can manipulate the data as you wish before saving it to database.

You can do like another service layer between the models

Check this enlightening articles:

https://medium.com/@jairvercosa/business-logic-in-django-projects-7fe700db9b0a

Same post, but more complete https://github.com/jairvercosa/ca_auth/

If you do not want to save using the DRF views, you can from the service layer, send the information somewhere else and do not use DRF save()... but, I do not really see the point of doing this.

You will be just using DRF to make the routes, and you will spend all the power.

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Gonzalo Amadio

[Wanderley S]

I would need to have more detailed information so I could understand the real needs.

Sorry if you already know what I'm going to explain here, but depending you background and technologies you've been worked with, working with Django and Django REST is a bunch easier than other frameworks, since Django and Python itself has ome design patterns implemented "native" .

In some design patterns you need to use DAO and other stuff and write too much code (not saying this is bad or good).

Django follows Python idea to achieve more by writing less code. Regarding models, Django implements (follows) the Active Record Design pattern.

So, if I could understand your ideia, with Django Rest Framework what you would have is:

• Model (Urls and Views)
• used to expose outside API data-contracts (in Django this would be the views.py file)
• Message Entity (Serializers)
• translate data Model ==> to MessageEntity and carry forward different layer (this would be done in serializers.py file)
• DAO (Model)
• its march with database table (models.py file with some managers.py, case necessary)

Another major and important concept about Django relies in understanding the "apps concept"

Take a long at Two Scoops of Django.

Different than other frameworks, Django advocates that you shouldn't have a massive monolithic project, but a project divided in many apps, this will allow you a loose coupling.

Well, hope I could help in any way.

Cheers,

Wanderley

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[woodson]

thanks Wanderley. you explain better than me.

we trying to build application on same way. Pls share if you have any sample application.

El mar., 5 nov. 2019 a las 1:39, woodson (<jess...@gmail.com>) escribió:

we are planning to build large application using Django rest framework . is it possible create different model or data contract ?

• Model
• used to expose outside API data-contracts
• Message Entity
• translate data Model ==> to MessageEntity and carry forward different layer
• DAO
• its march with database table

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Gonzalo Amadio

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