避免在FluentValidations中重复

Question

I have a validator for a CreateRequest and another for UpdateRequest .

I soon discovered that they are the same. The only difference is that one has an Id ( UpdateRequest ).

The validations are the same, to the same properties, but the entities are different.

How can I avoid duplicating the rules?

Currently I have

public class CreateValidator : AbstractValidator<CreateRequest> 
{
     RuleFor(p => p.Prop1)...  // Rule 1
     RuleFor(p => p.Prop2)...  // Rule 2
     RuleFor(p => p.Prop3)...  // Rule 3
}

public class UpdateValidator : AbstractValidator<UpdateRequest> 
{
     RuleFor(p => p.Id)...     // Rule 0
     RuleFor(p => p.Prop1)...  // Rule 1
     RuleFor(p => p.Prop2)...  // Rule 2
     RuleFor(p => p.Prop3)...  // Rule 3
}

They are the same except for the Rule 0.

Can I avoid duplication?

Answer 1

1. Make sure that your CreateRequest and UpdateRequest implement the same interface of are inherited from some base class(or one from another).

    public CreateRequest: Request{...} public UpdateRequest: Request{...} 

2. Create a generic validator class with restricted generic type parameter.

    public RequestValidator: AbstractValidator<T> where T: Request { RequestValidator() { RuleFor(p => p.Prop1)... // Rule 1 RuleFor(p => p.Prop2)... // Rule 2 RuleFor(p => p.Prop3)... // Rule 3 } } 

3. Create actual validator using inheritance.

    public CreateRequestValidator: RequestValidator<CreteRequest> { CreateRequestValidator() { } } public UpdateRequestValidator: RequestValidator<UpdateRequest> { UpdateRequestValidator() { RuleFor(p => p.Id)... } }