has_fields

Some macros helpful for processing forms with optional fields.

Usage

For instance, if you got a form like this:

let form = MyForm {
    id: 1,
    name: Some("name".to_string()),
    email: Some("email@example.com".to_string()),
    phone: None,
}

Here are some macros that might help you:

1. has_fields::has_fields!: Check if a struct has some fields. Returns a boolean.

   has_fields!(form, "name", "email") // true
   

2. has_fields::require_fields: Check if a struct has some fields. Returns a Result<(), Vec<&'static str>>.

   require_fields!(form, "name", "email") // Ok(())
   require_fields!(form, "name", "email", "phone") // Err(vec!["phone"])
   

Moreover, you can derive HasFields trait for your struct, and use these methods:

1. num_fields: Get the number of Some(...) or non-optional fields in a struct.

   form.num_fields() // 2
   

License

The Unlicense

Contributing

If you have any ideas, feel free to open an issue or a PR.