Adds nullable to double schema conversions (#589)

* Update double schema

* Update integration file tests

* Update release notes

Author: irvinesunday

src/Microsoft.OpenApi.OData.Reader/Generator/OpenApiEdmTypeSchemaGenerator.cs

@@ -195,8 +195,8 @@ public static OpenApiSchema CreateSchema(this ODataContext context, IEdmPrimitiv
                 case EdmPrimitiveTypeKind.Double: // double
                     schema.OneOf = new List<OpenApiSchema>
                     {
-                        new OpenApiSchema { Type = Constants.NumberType, Format = "double" },
-                        new OpenApiSchema { Type = Constants.StringType },
+                        new OpenApiSchema { Type = Constants.NumberType, Format = "double", Nullable = true },
+                        new OpenApiSchema { Type = Constants.StringType, Nullable = true },
                         new OpenApiSchema
                         {
                             UnresolvedReference = true,

src/Microsoft.OpenApi.OData.Reader/Generator/OpenApiSchemaGenerator.cs

@@ -121,12 +121,14 @@ public static IDictionary<string, OpenApiSchema> CreateSchemas(this ODataContext
 
             schemas[Constants.ReferenceNumericName] = new()
             {
-                Enum = new List<IOpenApiAny>
-                {
+                Type = Constants.StringType,
+                Nullable = true,
+                Enum =
+                [
                     new OpenApiString("-INF"),
                     new OpenApiString("INF"),
                     new OpenApiString("NaN")
-                }
+                ]
             };
 
             if (context.Settings.EnableODataAnnotationReferencesForResponses)

test/Microsoft.OpenAPI.OData.Reader.Tests/Generator/OpenApiSchemaGeneratorTests.cs

@@ -1105,10 +1105,12 @@ public void NonNullableDoublePropertyWithDefaultStringWorks()
   ""oneOf"": [
     {
       ""type"": ""number"",
-      ""format"": ""double""
+      ""format"": ""double"",
+      ""nullable"": true
     },
     {
-      ""type"": ""string""
+      ""type"": ""string"",
+      ""nullable"": true
     },
     {
       ""$ref"": ""#/components/schemas/ReferenceNumeric""

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.json

@@ -1152,7 +1152,8 @@
         "-INF",
         "INF",
         "NaN"
-      ]
+      ],
+      "type": "string"
     }
   },
   "parameters": {

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.yaml

@@ -757,6 +757,7 @@ definitions:
       - '-INF'
       - INF
       - NaN
+    type: string
 parameters:
   top:
     in: query

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.json

@@ -1258,7 +1258,9 @@
           "-INF",
           "INF",
           "NaN"
-        ]
+        ],
+        "type": "string",
+        "nullable": true
       }
     },
     "responses": {

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.yaml

@@ -829,6 +829,8 @@ components:
         - '-INF'
         - INF
         - NaN
+      type: string
+      nullable: true
   responses:
     error:
       description: error

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.json

@@ -103,7 +103,8 @@
         "-INF",
         "INF",
         "NaN"
-      ]
+      ],
+      "type": "string"
     }
   },
   "parameters": {

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.yaml

@@ -71,6 +71,7 @@ definitions:
       - '-INF'
       - INF
       - NaN
+    type: string
 parameters:
   top:
     in: query

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.json

@@ -108,7 +108,9 @@
           "-INF",
           "INF",
           "NaN"
-        ]
+        ],
+        "type": "string",
+        "nullable": true
       }
     },
     "responses": {