fix: nullable object's fields were missing (#1721)

src/components/Schema/Schema.tsx

@@ -63,20 +63,15 @@ export class Schema extends React.Component<Partial<SchemaProps>> {
       return <OneOfSchema schema={schema} {...this.props} />;
     }
 
-    if (type && Array.isArray(type)) {
+    const types = Array.isArray(type) ? type : [type];
+    if (types.includes('object')) {
+      if (schema.fields?.length) {
+        return <ObjectSchema {...(this.props as any)} />;
+      }
+    } else if (types.includes('array')) {
       return <ArraySchema {...(this.props as any)} />;
     }
 
-    switch (type) {
-      case 'object':
-        if (schema.fields?.length) {
-          return <ObjectSchema {...(this.props as any)} />;
-        }
-        break;
-      case 'array':
-        return <ArraySchema {...(this.props as any)} />;
-    }
-
     // TODO: maybe adjust FieldDetails to accept schema
     const field = ({
       schema,

src/services/models/Schema.ts

@@ -100,6 +100,10 @@ export class SchemaModel {
     this.activeOneOf = idx;
   }
 
+  hasType(type: string) {
+    return this.type === type || (Array.isArray(this.type) && this.type.includes(type));
+  }
+
   init(parser: OpenAPIParser, isChild: boolean) {
     const schema = this.schema;
     this.isCircular = schema['x-circular-ref'];
@@ -170,9 +174,9 @@ export class SchemaModel {
       return;
     }
 
-    if (this.type === 'object') {
+    if (this.hasType('object')) {
       this.fields = buildFields(parser, schema, this.pointer, this.options);
-    } else if ((this.type === 'array' || Array.isArray(this.type)) && schema.items) {
+    } else if (this.hasType('array') && schema.items) {
       this.items = new SchemaModel(parser, schema.items, this.pointer + '/items', this.options);
       this.displayType = pluralizeType(this.items.displayType);
       this.displayFormat = this.items.format;