Linked Questions
12 questions linked to/from Clean architecture validation in domain vs data persistence layer?
3
votes
4
answers
2k
views
Is validation part of presentation layer or business logic? [duplicate]
We're working on a new project (backend, API), following the "clean code" and "clean architecture" principles (described in Robert Martin's books), dividing our application into ...
- 139
78
votes
11
answers
22k
views
Is it really possible to decouple the UI from the business logic?
I'm reading about software architectures like Hexagonal architecture, Onion architecture etc.
They put a big emphasis on decoupling. The business logic sits at the centre and the UI sits on the ...
- 965
8
votes
6
answers
8k
views
Is it appropriate to process a property in the setter?
I have a class with a Name property, where the name is set by the end-user. In order to ensure compatibility with the rest of the environment, and to avoid rejecting a lot of inputs, some processing ...
- 310
6
votes
9
answers
3k
views
Java instanceof and Clean architecture
It seems to me that there is a conflict between clean architecture and the recommendation not to use instanceof. Consider the following code:
class ParentEntity {
}
class AEntity extends ParentEntity ...
- 209
8
votes
2
answers
4k
views
Error handling and exceptions in a layered (or onion) architecture [closed]
Given an onion architecture, what are the advantages and disadvantages of throwing exceptions in the business logic (which is in the center of the onion) for invalid parameters provided by the user?
...
- 257
4
votes
1
answer
5k
views
Sharing form validation rules between backend and frontend (Having single source of truth)
I'm currently working on a web app using ASP.NET Core (C#) on the backend and Next.js (TypeScript) on the frontend. I have a lot of forms that need to be validated and I don't want to write validation ...
- 1,569
1
vote
3
answers
1k
views
Validating string length separately vs. handling database error for max length
If my service is inserting into a varchar column with a certain max length, I can either
validate its length prior to inserting to avoid getting an error from the database if the string is too long
...
- 121
1
vote
3
answers
988
views
Repository w/ MVVM Pattern: Data Format Check, Where/When, Best Practice?
TL; DR
Where/When to check data format in MVVM + Repository Pattern is the best practice? Any suggestion or theory?
The Scene
Our team is working on an Android Project. We have a MVVM+repo structure:
...
- 119
3
votes
1
answer
338
views
Domain validation accessible by the presentation layer
I recently ordered a new credit card. I used the price comparison websites to find the best one that met my requirements.
I notice that these websites have a lot of validation on the client side. ...
- 7,139
3
votes
2
answers
264
views
Getting the UI to know about Business Rules for Form Controls
Situation:
VB.NET WinForms application, using the WinForms as a presentation layer project. Another class library project containing the business layer, in the form of CQS and Service classes, plus a ...
- 674
-1
votes
1
answer
181
views
Should we implement the state machine logic near the data in the "persistence" layer, or bring the data out and implement it in the "listener" layer?
The implementation is MVC. The View is isolated to the browser layer. The Model is isolated to the persistence layer. The Controller is split with: UI controls in the browser mostly so input is ...
- 503
1
vote
2
answers
102
views
When using data and domain models, where should validation take place? And how should errors be fed back to the user?
When using data and domain models, where does validation take place? Both or just
For example:
class UsersDB():
def create(self, user_data):
# Create user here
return ...
- 51