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5,559 Views • Nov 25, 2023 • Click to toggle off description
The answer is simple. Records are just values. Could an int validate itself? The same value could sometimes be valid, other times not. It all depends on the outer context.
A record, many believe, is more than just an int, and so it should validate itself. Let's examine that.
Should a 2-dimensional size insist on being positive? Or at least non-negative? Again, whatever the choice, that depends on the context.
You better have a separate function or an interface that does that. Now we're talking!
One variant would only allow strictly positive values. Another allows vertical and horizontal flipping, but will not let the size degenerate into a line. Yet another would allow just anything.
It is therefore common to pick or inject an appropriate strategy in code which must validate records on creation.
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#csharp #dotnet #functionalprogramming
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49 Comments
Top Comments of this video!! :3
Yup! Factory methods are the way forward, I would probably return empty records on failing validation, or even better an empty maybe monad to avoid unneeded exceptions though😊
3 |
In your scenario, you cannot create self-validating Size, because you don't have all required information. When you're operating on Size, you don't know if it's Mirrored or Regular, so later in the code, when you get Size as a parameter, you will also need to check if it's Mirrored or Regular. Wouldn't it better to also store that piece of information inside the Size? It would also allow you to self-validate the object. Maybe it's worth to create a video about why self-validating records are not a good idea? I've been using this approach for some time and never run into an issue.
3 |
Are you suggesting that callers should always validate e.g. Email value object before using them because the value object will never guarantee it's validity?
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Hi Zoran. Let's say you create a domain where all Size objects must be of the Mirrored type. If the Size record has a public ctor with no inherent validation, how would you enforce this invariant for all consumers of the type?
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Great channel man
1 |
I so disagree. That's why I only use records for dtos. Otherwise I keep using ValueObject. The pb with having both a public ctor as well as factories is that some developers will use the ctor where they should have used a factory.
1 |
What advantage does this bring over factory method?
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Can you explain to this noob what the delegate Size Create is doing please ? 😅
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int intIsNotValidated = 10000000000;
Sure!
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@thygrrr
5 months ago
I have been professionally coding for 30 years.
"Can an int validate itself?" just single-handedly leveled me up another notch.
4 |