Allow any Serialize type in RHS of map macro.

contrib/src/json/mod.rs

@@ -14,6 +14,11 @@ use self::serde::{Serialize, Deserialize};
 
 pub use self::serde_json::error::Error as SerdeError;
 
+pub use self::serde_json::value::Value;
+
+#[doc(hidden)]
+pub use self::serde_json::to_value;
+
 /// The JSON type, which implements `FromData` and `Responder`. This type allows
 /// you to trivially consume and respond with JSON in your Rocket application.
 ///
@@ -117,31 +122,38 @@ impl<T> DerefMut for JSON<T> {
     }
 }
 
-/// A nice little macro to create simple HashMaps. Really convenient for
+/// A nice little macro to create JSON serializable HashMaps, convenient for
 /// returning ad-hoc JSON messages.
 ///
+/// Keys can be any type that implements `Serialize`. All keys must have the
+/// same type, which is usually an `&'static str`. Values can be any type that
+/// implements `Serialize` as well, but each value is allowed to be a different
+/// type.
+///
 /// # Examples
 ///
 /// ```
 /// # #[macro_use] extern crate rocket_contrib;
-/// use std::collections::HashMap;
 /// # fn main() {
-/// let map: HashMap<&str, usize> = map! {
+/// let map = map! {
-///     "status" => 0,
+///     "message" => "Done!",
-///     "count" => 100
+///     "success" => true,
+///     "count" => 3,
 /// };
 ///
-/// assert_eq!(map.len(), 2);
+/// assert_eq!(map.len(), 3);
-/// assert_eq!(map.get("status"), Some(&0));
+/// assert_eq!(map.get("message").and_then(|v| v.as_str()), Some("Done!"));
-/// assert_eq!(map.get("count"), Some(&100));
+/// assert_eq!(map.get("success").and_then(|v| v.as_bool()), Some(true));
+/// assert_eq!(map.get("count").and_then(|v| v.as_u64()), Some(3));
 /// # }
 /// ```
 #[macro_export]
 macro_rules! map {
     ($($key:expr => $value:expr),+) => ({
-        use std::collections::HashMap;
+        use ::std::collections::HashMap;
-        let mut map = HashMap::new();
+        use $crate::json::{Value, to_value};
-        $(map.insert($key, $value);)+
+        let mut map: HashMap<_, Value> = HashMap::new();
+        $(map.insert($key, to_value($value));)+
         map
     });
 

contrib/src/lib.rs

@@ -42,7 +42,8 @@ extern crate lazy_static;
 
 #[cfg_attr(feature = "json", macro_use)]
 #[cfg(feature = "json")]
-mod json;
+#[doc(hidden)]
+pub mod json;
 
 #[cfg(feature = "templates")]
 mod templates;
@@ -52,6 +53,8 @@ mod uuid;
 
 #[cfg(feature = "json")]
 pub use json::JSON;
+#[cfg(feature = "json")]
+pub use json::Value;
 
 #[cfg(feature = "json")]
 pub use json::SerdeError;

examples/json/src/main.rs

@@ -9,13 +9,15 @@ extern crate serde_json;
 
 #[cfg(test)] mod tests;
 
-use rocket_contrib::JSON;
+use rocket_contrib::{JSON, Value};
 use std::collections::HashMap;
 use std::sync::Mutex;
 
 // The type to represent the ID of a message.
 type ID = usize;
-type SimpleMap = HashMap<&'static str, &'static str>;
+
+// The type of a `map!` invocation.
+type SimpleMap = HashMap<&'static str, Value>;
 
 // We're going to store all of the messages here. No need for a DB.
 lazy_static! {