How to make this work with Chrono

[lingfei1999]

Hi, firstly, thanks for creating this useful library. While using it, I have problem with TypeDef and Chrono. This is what I have:

pub struct Test { 
  pub created_date: NaiveDateTime
}

I do have the lib chrono with features serde, and it prints out to string json just fine, but doesn't seem to work with derive TypeDef.

[dbeckwith]

Every field's type needs to implement the TypeDef trait in order for the derive to work, which NaiveDateTime doesn't because it comes from a different library. In that case, you can use the type_of option here, like so:

#[derive(TypeDef)]
pub struct Test { 
  #[type_def(type_of = "String")]
  pub created_date: NaiveDateTime
}

This tells the derive to generate types for that field that match the types of String, which seems to be appropriate here since NaiveDateTime serializes to a string.