Add support to enforce inlining of all subschemas instead of using references. (#44)

This is needed to support use cases like openAPIV3Schema in Kubernetes CustomResourceDefinitions.


Co-authored-by: alex.berger@nexiot.ch <alex.berger@nexiot.ch>

schemars/tests/expected/inline-subschemas.json

@@ -0,0 +1,23 @@
+{
+  "$schema":  "https://spec.openapis.org/oas/3.0/schema/2019-04-02#/definitions/Schema",
+  "properties": {
+    "spec": {
+      "properties": {
+        "replicas": {
+          "format": "uint32",
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "replicas"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+     "spec"
+  ],
+  "title": "MyJob",
+  "type": "object"
+}

schemars/tests/inline_subschemas.rs

@@ -0,0 +1,21 @@
+mod util;
+use schemars::gen::SchemaSettings;
+use schemars::JsonSchema;
+use util::*;
+
+#[derive(Debug, JsonSchema)]
+pub struct MyJob {
+    pub spec: MyJobSpec,
+}
+
+#[derive(Debug, JsonSchema)]
+pub struct MyJobSpec {
+    pub replicas: u32,
+}
+
+#[test]
+fn struct_normal() -> TestResult {
+    let mut settings = SchemaSettings::openapi3();
+    settings.inline_subschemas = true;
+    test_generated_schema::<MyJob>("inline-subschemas", settings)
+}