Enabling singleton support

Author: FehintolaObafemi

src/swagger-generation/output/metadata.json

@@ -592,6 +592,24 @@
         }
       }
     },
+    "applications/domainRegistration": {
+      "beta": {
+        "entitySetPath": "applications/domainRegistration",
+        "isIdempotent": true,
+        "updatable": true,
+        "isContainment": true,
+        "isSingleton": true,
+        "pathSegmentName": "domainRegistration",
+        "containerEntitySet": "applications",
+        "resourceKey": {
+          "name": "uniqueName"
+        },
+        "orchestrationProperties": {
+          "save": [],
+          "get": []
+        }
+      }
+    },
     "oauth2PermissionGrants": {
       "beta": {
         "isIdempotent": false,

src/swagger-generation/src/config.ts

@@ -59,6 +59,8 @@ export interface EntityTypeConfig {
   EntitySetPath?: string
   ResourceKey?: ResourceKeyConfig
   OrchestrationProperties?: OrchestrationPropertiesConfig
+  IsSingleton?: boolean,
+  PathSegmentName?: string
 }
 
 export class Config {

src/swagger-generation/src/definitions/Metadata.ts

@@ -68,5 +68,7 @@ export interface EntityMetadata {
     compositeKeyProperties?: string[],
     relationshipMetadata?: RelationshipMetadata,
     resourceKey?: ResourceKey,
-    orchestrationProperties?: OrchestrationProperties
+    orchestrationProperties?: OrchestrationProperties,
+    isSingleton?: boolean,
+    pathSegmentName?: string
 }

src/swagger-generation/src/metadataWriter.ts

@@ -71,6 +71,8 @@ export const writeMetadata = (definitionMap: DefinitionMap, config: Config): Met
           resourceKey: entityTypeConfig.ResourceKey ? {
             name: entityTypeConfig.ResourceKey.Name
           } : undefined,
+          isSingleton: entityTypeConfig.IsSingleton,
+          pathSegmentName: entityTypeConfig.PathSegmentName,
           orchestrationProperties: {
             save: orchestrationProperties.Save?.map(p => ({ 
               name: p.Name,