serde_with_macros v2.1.0

Added

• Add new apply attribute to simplify repetitive attributes over many fields.
  Multiple rules and multiple attributes can be provided each.

  #[serde_with::apply(
      Option => #[serde(default)] #[serde(skip_serializing_if = "Option::is_none")],
      Option<bool> => #[serde(rename = "bool")],
  )]
  #[derive(serde::Serialize)]
  struct Data {
      a: Option<String>,
      b: Option<u64>,
      c: Option<String>,
      d: Option<bool>,
  }

  The apply attribute will expand into this, applying the attributs to the matching fields:

  #[derive(serde::Serialize)]
  struct Data {
      #[serde(default)]
      #[serde(skip_serializing_if = "Option::is_none")]
      a: Option<String>,
      #[serde(default)]
      #[serde(skip_serializing_if = "Option::is_none")]
      b: Option<u64>,
      #[serde(default)]
      #[serde(skip_serializing_if = "Option::is_none")]
      c: Option<String>,
      #[serde(default)]
      #[serde(skip_serializing_if = "Option::is_none")]
      #[serde(rename = "bool")]
      d: Option<bool>,
  }

  The attribute supports field matching using many rules, such as _ to apply to all fields and partial generics like Option to match any Option be it Option<String>, Option<bool>, or Option<T>.

Fixed

• The derive macros SerializeDisplay and DeserializeFromStr now take better care not to use conflicting names for generic values. (#526)
  All used generics now start with __ to make conflicts with manually written code unlikely.

  Thanks to @Elrendio for submitting a PR fixing the issue.