[rust-server] Restore support for nullable

modules/openapi-generator/src/main/resources/rust-server/models.mustache

@@ -145,19 +145,19 @@ pub struct {{{classname}}} {
 {{/description}}{{#isEnum}}    // Note: inline enums are not fully supported by openapi-generator
 {{/isEnum}}    #[serde(rename = "{{{baseName}}}")]{{#vendorExtensions}}{{#itemXmlName}}
     #[serde(serialize_with = "wrap_in_{{{itemXmlName}}}")]{{/itemXmlName}}{{/vendorExtensions}}{{#required}}
-    pub {{{name}}}: {{#vendorExtensions}}{{#x-nullable}}swagger::Nullable<{{/x-nullable}}{{/vendorExtensions}}{{{dataType}}}{{#vendorExtensions}}{{#x-nullable}}>{{/x-nullable}}{{/vendorExtensions}},
-{{/required}}{{^required}}{{#vendorExtensions}}{{#x-nullable}}    #[serde(deserialize_with = "swagger::nullable_format::deserialize_optional_nullable")]
-    #[serde(default = "swagger::nullable_format::default_optional_nullable")]
-{{/x-nullable}}{{/vendorExtensions}}
+    pub {{{name}}}: {{#isNullable}}swagger::Nullable<{{/isNullable}}{{{dataType}}}{{#isNullable}}>{{/isNullable}},
+{{/required}}{{^required}}{{#isNullable}}
+    #[serde(deserialize_with = "swagger::nullable_format::deserialize_optional_nullable")]
+    #[serde(default = "swagger::nullable_format::default_optional_nullable")]{{/isNullable}}
     #[serde(skip_serializing_if="Option::is_none")]
-    pub {{{name}}}: Option<{{#vendorExtensions}}{{#x-nullable}}swagger::Nullable<{{/x-nullable}}{{/vendorExtensions}}{{#isListContainer}}Vec<{{#items}}{{{dataType}}}{{/items}}>{{/isListContainer}}{{^isListContainer}}{{{dataType}}}{{/isListContainer}}{{#vendorExtensions}}{{#x-nullable}}>{{/x-nullable}}{{/vendorExtensions}}>,
+    pub {{{name}}}: Option<{{#isNullable}}swagger::Nullable<{{/isNullable}}{{#isListContainer}}Vec<{{#items}}{{{dataType}}}{{/items}}>{{/isListContainer}}{{^isListContainer}}{{{dataType}}}{{/isListContainer}}{{#isNullable}}>{{/isNullable}}>,
 {{/required}}
 
 {{/vars}}
 }
 
 impl {{{classname}}} {
-    pub fn new({{#vars}}{{^defaultValue}}{{{name}}}: {{#vendorExtensions}}{{#x-nullable}}swagger::Nullable<{{/x-nullable}}{{/vendorExtensions}}{{{dataType}}}{{#vendorExtensions}}{{#x-nullable}}>{{/x-nullable}}{{/vendorExtensions}}, {{/defaultValue}}{{/vars}}) -> {{{classname}}} {
+    pub fn new({{#vars}}{{^defaultValue}}{{{name}}}: {{#isNullable}}swagger::Nullable<{{/isNullable}}{{{dataType}}}{{#isNullable}}>{{/isNullable}}, {{/defaultValue}}{{/vars}}) -> {{{classname}}} {
         {{{classname}}} {
 {{#vars}}            {{{name}}}: {{#defaultValue}}{{{defaultValue}}}{{/defaultValue}}{{^defaultValue}}{{{name}}}{{/defaultValue}},
 {{/vars}}

modules/openapi-generator/src/test/resources/2_0/rust-server/rust-server-test.yaml

@@ -19,3 +19,14 @@ definitions:
     additionalProperties:
       type: string
     example: "foo"
+  aNullableContainer:
+    type: object
+    properties:
+      NullableThing:
+        type: string
+        x-nullable: true
+      RequiredNullableThing:
+        type: string
+        x-nullable: true
+    required:
+      - RequiredNullableThing

samples/server/petstore/rust-server/output/rust-server-test/api/openapi.yaml

@@ -19,4 +19,15 @@ components:
       description: An additionalPropertiesObject
       example: foo
       type: object
+    aNullableContainer:
+      properties:
+        NullableThing:
+          nullable: true
+          type: string
+        RequiredNullableThing:
+          nullable: true
+          type: string
+      required:
+      - RequiredNullableThing
+      type: object
 

samples/server/petstore/rust-server/output/rust-server-test/src/models.rs

@@ -10,6 +10,28 @@ use models;
 use swagger;
 
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct ANullableContainer {
+    #[serde(rename = "NullableThing")]
+    #[serde(deserialize_with = "swagger::nullable_format::deserialize_optional_nullable")]
+    #[serde(default = "swagger::nullable_format::default_optional_nullable")]
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub nullable_thing: Option<swagger::Nullable<String>>,
+
+    #[serde(rename = "RequiredNullableThing")]
+    pub required_nullable_thing: swagger::Nullable<String>,
+
+}
+
+impl ANullableContainer {
+    pub fn new(required_nullable_thing: swagger::Nullable<String>, ) -> ANullableContainer {
+        ANullableContainer {
+            nullable_thing: None,
+            required_nullable_thing: required_nullable_thing,
+        }
+    }
+}
+
 /// An additionalPropertiesObject
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct AdditionalPropertiesObject {