Hi Everybody, I have a question about Clean Architecture and

Question

Hi Everybody, I have a question about Clean Architecture and

Domain Driven Design:
Imagine you have a Blog API with 2 services: Post & Comment
When you want to add a comment to a post, where should you check the post exists or not? in comment service (by calling the post service method)? in the earlier layer who calls create comment method? or else where?

0

12.05.2021

24 ответов

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Насер Мирзаи Автор вопроса

jeffotoni
so, if you are using DDD as mentioned, I believe y...

a friend suggested to use post service in comment service to check post exists or not. but with an interface: type PostIDVerifier interface { PostExists(ctx, id) (bool, error) }

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12.05.2021

jeffotoni

Насер Мирзаи
a friend suggested to use post service in comment ...

it's a way, so you can implement the interface in your other comments service

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
it's a way, so you can implement the interface in ...

yep, and post service doesn't depend on comment service. also comment service just need an implementation of the inteface it needs, not the whole post service.

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12.05.2021

jeffotoni

Насер Мирзаи
yep, and post service doesn't depend on comment se...

it's a way

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
it's a way

any other suggestions you have?

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12.05.2021

jeffotoni

Насер Мирзаи
any other suggestions you have?

so, another way would be to make the pkgs of your services when they are public/global

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
so, another way would be to make the pkgs of your ...

you mean using both services in an endpoint or transport layer (names are from gokit.io)?

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12.05.2021

jeffotoni

Насер Мирзаи
you mean using both services in an endpoint or tra...

so, as I said, it has several paths. if you choose to use the DDD you can follow the path above. If you are going to do a defragmentation of the service for example you can create a pkgs and reuse it whenever you want using or not using the interface in the way you find most flexible and easy. And you can also implement something like a go kit - like microservices if you want. If you are going to do something monolith it makes sense your DDD way

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
so, as I said, it has several paths. if you choose...

Thanks a lot!

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12.05.2021

jeffotoni

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Thanks a lot!

to make it clearer, and maybe it will clear up your doubts much better than just talking around here. it implements something simple using interfaces and DDD, it implements a decoupled pkg or repo and it implements a global pkg or repo to reuse and with this you will understand in practice when using each of them models and architectures.

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12.05.2021

jeffotoni

Насер Мирзаи
Thanks a lot!

I don't have all the examples here, but if I had I would send it to you, what I have here are private But I'll see if I can later make some models available for you to have an idea. Another detail, you don't need to be stuck with any of this, and you can use it in the way that is best for you.

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
I don't have all the examples here, but if I had I...

I read some implementations of DDD+Clean Arch before, but to be honest I didn't like their ways. the most adorable way is gokit IMO (if you name that DDD+Clean)

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12.05.2021

jeffotoni

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I read some implementations of DDD+Clean Arch befo...

it is very swollen, dense and clean, it has nothing, in my view it becomes even more boring to keep it growing as things get more complicated.

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
it is very swollen, dense and clean, it has nothin...

I use an instruction near to it. for example I don't use endpoints and I think we can skip it ;)

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12.05.2021

jeffotoni

Насер Мирзаи
I use an instruction near to it. for example I don...

This is very good in Go, the flexibility and freedom that we all have in implementing models according to our needs

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12.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
This is very good in Go, the flexibility and freed...

Exactly 👌🏻

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12.05.2021

jeffotoni

I ended up reading an excerpt from the book Go, and he tries to present DDD using Go, and he calls DDD Lite. Maybe it will help you to clarify even more about it when using Go https://github.com/ThreeDotsLabs/wild-workouts-go-ddd-example

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14.05.2021

Насер Мирзаи Автор вопроса

jeffotoni
I ended up reading an excerpt from the book Go, an...

❤️ I'll read that soon

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14.05.2021

jeffotoni

Насер Мирзаи
❤️ I'll read that soon

🥳🥳🥳😊

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14.05.2021

Abraão Carvalho

jeffotoni
🥳🥳🥳😊

Wow, look at the sensei here hehehe

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19.05.2021

jeffotoni

Abraão Carvalho
Wow, look at the sensei here hehehe

😊😊😍😍

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19.05.2021

jeffotoni

Abraão Carvalho
Wow, look at the sensei here hehehe

the group here is also very good

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19.05.2021

Abraão Carvalho

jeffotoni
the group here is also very good

Wonder, the more the better.

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19.05.2021

jeffotoni · Accepted Answer

jeffotoni

so, if you are using DDD as mentioned, I believe you will implement, Get, Post, Update everything in your POST service. And when iimplementar Comment will reuse it. But I am weak in this model, I don't use much DDD around here, most services are defragmented and this GET would be a repo being reused by any module that wants to use it.

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12.05.2021

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