[Rust] Implement 'object' type conversion (#6846)

* [Rust] Use serde Value for objects

This hopefully fixes the previous TODO; it at least fixes compilation
errors for the specific swagger model I'm working with.

* [Rust] Update Cargo.toml to specify versions

Letting the version float freely is scary, to say the least.

This gives it a better chance at being future-proof.

When the crate author had a recommended selector I picked that,
otherwise I went semver compatible.

* [Rust] Regenerate the example

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/RustClientCodegen.java

@@ -99,8 +99,7 @@ public class RustClientCodegen extends DefaultCodegen implements CodegenConfig {
         typeMapping.put("file", "File");
         typeMapping.put("binary", "Vec<u8>");
         typeMapping.put("ByteArray", "String");
-        // TODO  what should 'object' mapped to
-        typeMapping.put("object", "Object");
+        typeMapping.put("object", "Value");
 
         // no need for rust
         //importMapping = new HashMap<String, String>();

modules/swagger-codegen/src/main/resources/rust/Cargo.mustache

@@ -4,14 +4,14 @@ version = "{{{packageVersion}}}"
 authors = ["Swagger Codegen team and contributors"]
 
 [dependencies]
-serde = "*"
-serde_derive = "*"
-serde_yaml = "*"
-serde_json = "*"
-base64 = "*"
-futures = "*"
-hyper = "*"
-url = "*"
+serde = "1.0"
+serde_derive = "1.0"
+serde_yaml = "0.7"
+serde_json = "1.0"
+base64 = "~0.7.0"
+futures = "0.1.16"
+hyper = "0.11.6"
+url = "1.5"
 
 [dev-dependencies]
 tokio-core = "*"

modules/swagger-codegen/src/main/resources/rust/model.mustache

@@ -5,6 +5,9 @@
 /// {{{classname}}} : {{{description}}}
 {{/description}}
 
+#[allow(unused_imports)]
+use serde_json::Value;
+
 #[derive(Debug, Serialize, Deserialize)]
 pub struct {{classname}} {
 {{#vars}}