From 8510a9101963a4210b118599dffe2c8ea74cff0c Mon Sep 17 00:00:00 2001
From: Zloooy <gu1999yra@yandex.ru>
Date: Sun, 27 Apr 2025 20:48:20 +0300
Subject: [PATCH] Make it possible to process a specification without defined
 `components`. According to [OpenAPI
 spec](https://spec.openapis.org/oas/v3.1.1.html#fixed-fields-5) the
 `components`, `components.schemas` and `components.securitySchemas` fields
 are optional. Commit makes it possible to process such files. Removed part
 *.g.dart file declaration because the lack of schemas makes it redundant.

---
 .../lib/src/openapi_code_builder.dart           | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/packages/openapi_code_builder/lib/src/openapi_code_builder.dart b/packages/openapi_code_builder/lib/src/openapi_code_builder.dart
index 4ab0490..6d7a187 100644
--- a/packages/openapi_code_builder/lib/src/openapi_code_builder.dart
+++ b/packages/openapi_code_builder/lib/src/openapi_code_builder.dart
@@ -134,9 +134,10 @@ class OpenApiLibraryGenerator {
   final lb = LibraryBuilder();
   final securitySchemesClass = ClassBuilder()..name = 'SecuritySchemes';
   final List<Expression?> routerConfig = <Expression>[];
+  bool createdSchemaClass = false;
+  bool createdSchemaEnum = false;
 
   Library generate() {
-    lb.body.add(Directive.part(partFileName));
     var myRequireFreezed = false;
     void requireFreezed() {
       if (myRequireFreezed) {
@@ -151,10 +152,12 @@ class OpenApiLibraryGenerator {
     }
 
     // create class for each schema..
-    for (final schemaEntry in api.components!.schemas!.entries) {
-      _schemaReference(schemaEntry.key, schemaEntry.value!);
+    if (api.components?.schemas != null) {
+      for (final schemaEntry in api.components!.schemas!.entries) {
+        _schemaReference(schemaEntry.key, schemaEntry.value!);
+      }
     }
-    if (api.components!.securitySchemes != null && !ignoreSecuritySchemes) {
+    if (api.components?.securitySchemes != null && !ignoreSecuritySchemes) {
       for (final securityScheme in api.components!.securitySchemes!.entries) {
         _securitySchemeReference(securityScheme.key, securityScheme.value!);
       }
@@ -788,6 +791,9 @@ class OpenApiLibraryGenerator {
           }
         }
       }
+      if (createdSchemaClass || createdSchemaEnum) {
+        lb.body.insert(1, Directive.part(partFileName));
+      }
     });
     lb.body.add(c);
     lb.body.add(clientInterface.build());
@@ -1023,11 +1029,12 @@ class OpenApiLibraryGenerator {
         'Creating schema class. for ${schemaObject.referenceURI} / $key');
     if (schemaObject.enumerated?.isNotEmpty == true) {
       final e = _createEnum(componentName, schemaObject.enumerated!);
+      createdSchemaEnum = true;
       return e;
     }
     final c = _createSchemaClass(componentName, schemaObject);
     lb.body.add(c);
-
+    createdSchemaClass = true;
     return reference;
   }