Function barrel::types::foreign_schema

pub fn foreign_schema<S, I>(
    schema: S, 
    table: S, 
    keys: I, 
    on_update: ReferentialAction, 
    on_delete: ReferentialAction
) -> Type where
    S: Into<String>,
    I: Into<WrapVec<String>>, 

Like foreign(...) but letting you provide an external schema

This function is important when making cross-schema references