Kill Anemic Domain Models with Encapsulation: The Hard Part
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- Опубликовано: 15 сен 2024
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Ready to level up your OOP and OOD skills? In this video, we dive into the world of encapsulation, a crucial concept in object-oriented programming and object-oriented design. Encapsulation helps us tackle issues that arise in anemic domain models, making our software more robust and efficient. Through a hands-on demo, we reveal how encapsulation can turn an anemic domain model into a rich, well-structured one.
The key takeaway from this video is the vital role encapsulation plays in preserving class invariants and ensuring the smooth functioning of your application.
The video walks you through a step-by-step demonstration of transforming an anemic domain model into a powerful rich domain model using encapsulation techniques. This demo is the perfect example of how encapsulation can solve the issues that cause bugs, making your system more consistent and in line with object-oriented design principles.
Throughout the video, we touch upon the concept of design by contract and its role in developing maintainable software systems. We highlight the connection between encapsulation and the broader principles of object-oriented design, focusing on the importance of a solid class design.
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#oop #csharp #aspnetcore
thanks Zoran, I like your explanation.
Hvala Zorane
Awesome
amazing video. I do not understand how you tell the ef that AuthorsCollection has to be loaded in Book. If AuthorsCollection is internal (in domain project) and the repository is placed in an infrastructure project, it is impossible that Book DbSet reaches AuthorsCollection and includes them when GetBooks method from repository is called.
Entity Framework is using reflection. It can even populate private members if needed, though you must specify non-public members with a string, rather than with a lambda.
@@zoran-horvatIt's been years since I've written a dB application and haven't used EF. So it uses reflection, that's awesome. I've watch many of your videos wondering how the data is materialised, now I know.
But I dislike Blazer, once again MS have gone for interleaving HTML and code, so messy. This is no better than classic VB Web pages in this respect, written plenty of those. I much prefer markup like AngularJS. Maybe HTMX has the solution to this old problem.
@@nickbarton3191 Blazor is just one of the implementations of WebAssembly, which is a separate standard defining a virtual machine and the corresponding byte code. It has little to do with Microsoft. Wasm can execute on any system, such as a browser or an embedded system, though it seems like only the browsers have accepted it so far.
@@zoran-horvat Ah OK, I'm out of touch with web programming.
Once again. I hate EF Core for poor DDD support. All these code tricks with Lazy and alike are needed because navigation properties cannot be set through constructor. And there's no way to force EF to call some private method after entity is materialized. EF team does an excellent job and delivers many features, but in most cases those features are adding convenience for anemic models. ='(
I agree. It's time for MSFT to rewrite EF with modern design principles in mind.
Hi Zoran, doesn't the bool TryMoveAuthorUp(int index) functions breaks the command/query separation principle? Or is it something you don't worry about?
Command/query separation principle has a corollary: it is common to return the command execution status in situations when querying for the same information after the command would look awkward, inefficient, needlessly complex or be outright impossible.
A common case is when a command creates a child object and adds it to private structures that it also returns the newly created object, or at least a reference to it, like an ID, for the caller's bookkeeping (e.g. to add it to a DbContext, so that the child object will be persisted).
However, it would be a violation of the principle if the command would return a result that would otherwise qualify as a query. The danger comes from some caller using such command in order to fetch its result, not knowing, or tolerating, the side effects caused by its action, which might not be appropriate in that situation.
10:20 - why did you not sort list in AuthorsCollection's setter?
Because it is populated by EF.
I am working on a project, where we are using anemic design pattern throughout the project. We have anemic domain classes which are used everywhere and we have services to perform business logic, we are also using CQRS which then call these services so buniess logic divided between services and CQRS. Can you make a video or suggest how to move from anemic design model to rich domain in such cases
I have plans for a series of videos dedicated to the gradual process of improving some typical deficiencies in the design, though I still don't have a timeline when I will start recording them.
I also have a workshop ready, which I am holding in companies, titled Gradually Improving Software Design. If your managers are interested in organizing a training for your team, they can contact me directly for details.
10:20 there is easy way to do same - you can sort authors in setter of AuthorCollection property.
That property is managed by EF.
@@zoran-horvat and that is problem with it?? ef still need to call setter...
@@alexeycherepanov9150 It is not the problem with that property. It is its purpose.
How would you sort it anyway? It is an ICollection.
@@zoran-horvat something like this:
private ICollection _authorsCollection;
internal ICollection AuthorsCollection
{
get => _authorsCollection;
set => _authorsCollection = value.OrderBy(x=>x.Ordinal).ToArray();
}
@@zoran-horvat something like this:
private ICollection _authorsCollection;
internal ICollection AuthorsCollection
{
get => _authorsCollection;
set => _authorsCollection = value.OrderBy(x=>x.Ordinal).ToArray();
}
They could still sort by last name.
Yes, but that wouldn't make it the list of authors of a book.