[[test]]

name = "serde-de-xsi"

required-features = ["serialize"]

path = "tests/serde-de-xsi.rs"

- [#850]: Add `Attribute::as_bool()` method to get an attribute value as a boolean.

- [#850]: Add `Attributes::has_nil()` method to check if attributes has `xsi:nil` attribute set to `true`.

- [#497]: Handle `xsi:nil` attribute in serde Deserializer to better process optional fields.

[#497]: https://github.com/tafia/quick-xml/issues/497

[#850]: https://github.com/tafia/quick-xml/pull/850

/// Determines if subtree started with the specified event shoould be skipped.

///

/// Used to map elements with `xsi:nil` attribute set to true to `None` in optional contexts.

///

/// We need to handle two attributes:

/// - on parent element: <map xsi:nil="true"><foo/></map>

/// - on this element: <map><foo xsi:nil="true"/></map>

///

/// We check parent element too because `xsi:nil` affects only nested elements of the

/// tag where it is defined. We can map structure with fields mapped to attributes to

/// the `<map>` element and set to `None` all its optional elements.

fn should_skip_subtree(&self, start: &BytesStart) -> bool {

self.de.reader.reader.has_nil_attr(&self.start) || self.de.reader.reader.has_nil_attr(start)

}

// We cannot use result of `peek()` directly because of borrow checker

let _ = self.map.de.peek()?;

match self.map.de.last_peeked() {

DeEvent::Start(start) if self.map.should_skip_subtree(start) => {

self.map.de.skip_next_tree()?;

visitor.visit_none()

}