Comment by Álvaro García on A very basic doubt about who should start an...
I wanted to tell new Order.Create(paramIdEmployee), like you tell at last. I didn't write an space between new and Order.Create(oaranIdEmployee). So newOrder is not another class or entity.
View ArticleComment by Álvaro García on A very basic doubt about who should start an...
Thanks for clearing some questions. If I understand correctly, in you code is the client who create the instance of the employee and the application layer use it diretly. Wouldn't it better the...
View ArticleComment by Álvaro García on How to update a child entity of an aggregate root...
I am storing the price in the product the actual price, but I store the price in the offer too, that is the price that the product had in the moment to create the offer, so it can´t be changed never....
View ArticleComment by Álvaro García on Is it needed a unit of work with DDD?
Thanks for the answer. Perhaps I didn't exaplain well. In the example of person with address and cars. Yes, I have one aggregate and I have my Person repository for that, and this repository can...
View ArticleComment by Álvaro García on Is it needed a unit of work with DDD?
"DDD has the concept of separating out Aggregate Roots". Do you mean that one bounded context should to have only one AR?
View ArticleComment by Álvaro García on In the state pattern, what happens when the...
@DocBrown Thanks for that. It is a good idea to use ChatGPT for that, sometimes my english is not very good.
View ArticleComment by Álvaro García on Is it a good practice to allow null FKs?
Really cost is not calculated. It is a value that the user set in each case. Anyway, calculated or not, which is the difference? At the end it is a value with the total cost. For example for a product,...
View ArticleComment by Álvaro García on Is it a good practice to allow null FKs?
Thanks for your detailed answer. But then, in TPT, if I misunderstood, if I want to know the total cost, I have to do two queries, one to know the total costs of the products and another to know the...
View ArticleComment by Álvaro García on How to establish the relationship between two...
When I talk about bounded context, I mean that I have a system (a bounded context) to manage files (create, update, delete and any other actions that I could do about files). And when I talk about...
View ArticleComment by Álvaro García on How to establish the relationship between two...
@RikD Bill doesn't need the file to acomplish any task, just I want to stablish a relationship between a bill and a file. But the bill doesn't need a file to pass from created to paid or some other...
View ArticleComment by Álvaro García on Where to define the interfaces of the...
Thanks for the detail answer. But to clear when I tell that the domain should be agnostic about persistence, I wanted to mean that the domain shouldn't know if the data is persisted or not. If the...
View ArticleComment by Álvaro García on MVVM Commands - one command for everything or...
I am agree with this idea, and I am thinking how to implement it, but i don't find the best way to do it. Could you show how could I implement it? Thanks so much.
View ArticleDoubt about DDD, entity core and backing field
I was reading the documentation about how to use Entity Core in a DDD way. This is the documentation.It is said that I can configure EF to can map an internal private field to a private field, the...
View Articleupdate state with the rest of properties or to have an action only to update...
I am thinking in a common orders and order lines example. The order has a state and depends on the state, I can do some actions or not.I guess that a good option for that it is to use the state...
View ArticleOne provider for all entities or different according to needs?
I am trying to design in DDD the management of orders to a privider.The order has to have the information of the provider to which i will order the items. Later I will add lines to the order. This...
View ArticleHow to know the invoices of a project?
I have a project in which I have to manage projects, invoices and orders to providers. So I think that I can define three bounded context.First bounded context: Projects.Second bounded context:...
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Why is the product of the order item a reference to the ID of the product and...
I am seeing this example in the Microsoft documentation:Here we can see how OrderItem has a reference to the ID of the product, it is the first option that sure people uses to think, me too.But I was...
View ArticleIs this a good alternative to state pattern?
I was trying to use the state pattern in a DDD aggregate, but I was thinking in the following alternative.In sumary, the state pattern controls what actions can be done in each state. This makes to...
View Articlein DDD, when I don't want navigation property from child to parent, is it...
I have this:Class Order{ long ID; ...}Class Item{ long Id; IdProduct; decimal Amount; ...}Perhaps I misunderstood what means bidirectional relation in DDD, because I have read that if it is possible,...
View ArticleIn DDD, concurrency belongs to application layer?
In DDD, the model has to implement only the bussiness logic, and it has not the responsability about another things, like persistance.So I was thinking that perhaps is in the application layer a good...
View ArticleWhy is it needed to use an event to notify the order was modified when I add...
I was reading some examples how to handle concurrency in DDD. One example is in this repository:...
View ArticleHow to update many properties in DDD?
I have this order:class Order{ long Id; string Concept; string Comments; //another properties UpdateConcept(string paramConcept) {...} UpdateComments(string paramComments) {...}}In the domain entity, I...
View ArticleWhere to send the email to notify an error in a worker?
I have a service that use a worker to run a periodic task.I will not use a concrete language because it is a generic question, so I will expose the general idea.MainProgram{ Worker.Start(); wait...
View ArticleSecurity of the cerfiticates in the client application in a gRPC service
I have a gRPC service and I was thikning about the security aspects in the client side.I have only one certificate (public and private certificates) for the client, that it is uses for all my clients,...
View ArticleDoubts how to design a card game in DDD
I was thinking how to design a simple cards game, like poker, in a DDD way, but I am not sure about some points.Basically what I want is this, but I will try to simplify the problems that I have.I have...
View ArticleHow to get the information from another root entity to validate some operation?
I am trying to put in practice a small DDD example but I have some dubts.In my example, I have an Order and a Status.The Order can be this:Order{ long Id; long IdStatus; long IdBuyer; Address...
View ArticleWhere is the advantage to use Auth0 with gRPC?
I have read this example:https://auth0.com/blog/securing-grpc-microservices-dotnet-core/In this example it explains how to implement authorization in a gRPC service.It says that the client request a...
View ArticleWhen an entity has state, all the behavior depends on the state?
I was thinking in the common example orders, that can be in different statates. From create to pending to accept, accepted, sent... and so on.But the order has data too, for example the client, the...
View ArticleIn DDD, is the root aggregate who has to expose the methods to tell if a...
Thinking in the classic example of orders and lines.I would like to use the domain classes in the presentation layer, so as to check if an action or a property is correct, the main code is in the...
View ArticleHow to update a child entity of an aggregate root when I modify a property in...
I have one bounded conext, offers, that has Offers as root aggregate and Items as child entity.I have another bounded context, products, which has Products as root aggregate, Providers as another root...
View ArticleIs it s agood idea use as foreign key two fields instead of the primary key?
I have this two tables:Documents(ID, IDTypeOfDocument, BigIntReference);I have a documents table that has and ID that is an autonumeric bigint. Also I have categories, and also it has a big int as...
View ArticleHow to design this case in DDD (domain-driven design)?
I have an employee that has to record the time when it starts to work and the time when it finishes.This records can be associated with a proyect or not. Project could be null.The proyect has an ID and...
View ArticleWhere to control optimistic concurrency in a domain-driven design (DDD)...
I am thinking how to develop an application in a DDD way, and now I am thinking about the concurrency part.In some examples I have seen that in the domain classes are injected with dependency injection...
View Articlehow to design the bounded contexts in DDD?
The context, or bounded contexts, it could be defined as a logical boundary of a domain where particular terms and rules apply consistently.There are another definitions but more or less, this could be...
View ArticleIs it needed a unit of work with DDD?
Reading about DDD, i have read that it is needed to have a repository per each aggregate entity.For example, in an ordering system, I should have a repository for the order and another repository for...
View ArticleI have to have one application layer for all the projects or one application...
I have a project with various bounded contexts. I have Purchases bounded context and product bounded context.The two projects are developed by two diferent persons, so I am organazing the projects in...
View ArticleWhere to define the interfaces of the infrastructure in a clean architecture...
I have been reading about clean architecture and following Domain-Driven Design. In all the examples I have found, the interfaces of the repository are defined in the domain.However, it is in the...
View ArticleComment by Álvaro García on Why is it so common to use the dbContext directly...
Thanks for the answer. I understand for small projects it could be over engineering, but if in the future I want to update to a new version of entity core, that perhaps changes methods, or change...
View ArticleWhy is it so common to use the dbContext directly in the controller in a...
Actually, in a Web API application using Entity Core, it seems very common to inject the application context to the controllers, so the controllers use directly the dbContext to do its work.Something...
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