From c8ac41c051f0557e5a1d22ad2737bb3cde16b650 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?N=C3=A1ndor=20Istv=C3=A1n=20Kr=C3=A1cser?=
 <bonifaido@gmail.com>
Date: Tue, 1 Oct 2019 05:31:55 +0200
Subject: [PATCH] go: add os import in case of File return type (#3996)

---
 .../openapitools/codegen/languages/AbstractGoCodegen.java    | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java
index 019d3331e28..60f55a343df 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java
@@ -377,6 +377,11 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
         boolean addedOSImport = false;
         boolean addedReflectImport = false;
         for (CodegenOperation operation : operations) {
+            // import "os" if the operation uses files
+            if (!addedOSImport && "*os.File".equals(operation.returnType)) {
+                imports.add(createMapping("import", "os"));
+                addedOSImport = true;
+            }
             for (CodegenParameter param : operation.allParams) {
                 // import "os" if the operation uses files
                 if (!addedOSImport && "*os.File".equals(param.dataType)) {