Questions tagged [onion-architecture]
The *Onion Architecture* is a software architecture proposed by Jeffrey Palermo. It is similar to the *Hexagonal Architecture* (Ports and Adapters) proposed by Alistair Cockburn.
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Onion architecture object mapping
I'm reading and playing a bit with Onion on a mock side project and things got a little desperate with all the objects and the mappings.
Consider this Diagram of a request and the various ...
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How to segregate and name application services in DDD?
Below is an example scenario that can be used to illustrate your answer.
Let's say there is a CoffeeMachine aggregate with a set of methods similar to the following:
Methods used by admins.
...
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Repository interfaces returning DTO in clean architecture used by query handlers
Repository interfaces are often defined in the Domain layer. This makes sense for command handlers, which call repository methods and return nothing. But what about query handlers that call repository ...
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How to persist an entity corresponding to a polymorphic association table in Domain-Driven Design?
A polymorphic association table is a database design pattern that allows a single table to associate with multiple other tables, where the related tables can be of different types.
Scenario: Multiple ...
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How to handle pagination logic in a layered architecture without making premature decisions?
I'm working with a layered architecture and I'm unsure where to place the pagination logic. This answer suggests that it's not a domain concern, which I think makes sense. In most cases, pagination ...
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Should our api-response-to-domain-entity transform functions be in the API/Infrastructure layer, or the Domain layer?
Should our api-response-to-domain-entity transform functions be in the API/Infrastructure layer, or the Domain layer?
We have a react-native mobile application written in TypeScript.
We have separated ...
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Onion Architecture: Where to put Hangfire specific logic
We have a .net core app with the following folder / onion structure:
WidgetApp -> Core -> Application -> JobAutoStarter -> JobAutoStarter.cs
WidgetApp -> Core -> Domain -> ...
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How to structure libraries/solution for Onion Architecture with Model View Presenter pattern?
Hobby coder here, so please be gentle! My coding is taking me into the necessary realms of architecture due to increasingly complex apps. I'm wondering how to structure my solutions which will involve ...
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Where to perform conditional mapping in Domain Driven Design?
How can I do conditional mapping in Domain Driven Design?
Let's say my application is structured like this:
- Core
- Domain
- Application
- Presentation
- DTOs
- API
I have an aggregate root ...
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Is having many build-once factories a sign of bad dependency injection design?
I have a form. It contains things like grids. Users do things with these grids and what they do with them is sent to a SQL server. Clearly, the server is a volatile dependency and should be dependency ...
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deciding where to put "formatting" logic - database or in application layer
We have an application that fetches user data from an Azure tenant via MS Graph. We need to distinguish between guests and regular members.
Guests come back with Usernames that look like this:
...
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Why is the dependency flow in the onion architecture are the way they are?
Why does the infrastructure layer depend on the application layer, and the application layer depend on the domain layer in the onion architecture ?
In its definition, the dependency flow inwards. But ...
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onion architecture - calling external APIs
Umbrella Question
In an onion architecture, where do all the components needed to consume an external API fit in?
The following is the architecture I have so far, based off an example found here: ...
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Where to save entity metadata in a Ports-And-Adapters Architecture
I’m using a hexagonal/clean/ports-and-adapter architecture. For the sake of simplicity, I’ll only talk about domain and infrastructure here, where the infrastructure has dependencies on the domain but ...
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High level 'implementation' of a use case in a layered/DDD architecture
I am trying to understand layered architectures and apply some DDD fundamentals to improve my architecture. I am finding that determining "what" an application service actually is, what its ...
