Asp.net Core Web Api Override Model Validation - asp.net-core

Question

I am creating an asp.net core web api application.
Where I am try to validate my models using fluent validation.
this is my model and validator.
public class Data
{
public string Name { get; set; }
public int Age { get; set; }
}
public class DataValidator : AbstractValidator<Data>
{
public DataValidator()
{
RuleFor(x => x.Name)
.NotEmpty()
.MaximumLength(5);
RuleFor(x => x.Age)
.LessThan(80);
}
}
Everything works fine.
Fluent validation returns all the validations together except following case.
When my request contains following JSON, Fluent Validation doesn't get hit.
Asp.net core model validation is take place.
in that case I am getting single validation error.
{
"name": 123,
"Age" : 100
}
I got following validation message.
The JSON value could not be converted to System.String. Path
How to override above default message?
Is there any way to handle above validation in Fluent Validation?
I want both 'name' and 'age' validation messages together.

Answer 1

Let's look at your binding model:
public class Data
{
public string Name { get; set; }
public int Age { get; set; }
}
Here, Name is a string while Age is an int.
Your validator is just fine, otherwise you should get a compilation error when you build the app.
Now, let's look at the JSON:
{
"name": 123,
"Age" : 100
}
Instead of using name, you should use Name. Plus, the value of Name should be a string, i.e. "123" instead of 123. i.e.
{
"Name": "123",
"Age": 100
}
After that, you should be able to get the expected validation errors.