OpenAPITools · jasondamour · Feb 17, 2026
diff --git a/...-generator/src/main/java/org/openapitools/codegen/languages/TerraformProviderCodegen.java b/...-generator/src/main/java/org/openapitools/codegen/languages/TerraformProviderCodegen.java
@@ -45,6 +45,11 @@ public class TerraformProviderCodegen extends AbstractGoCodegen {
     protected String providerAddress = "registry.terraform.io/example/example";
     protected String providerVersion = "0.1.0";
 
+    // Track which tags qualify as resources vs data sources so we can
+    // delete non-qualifying files in postProcessFile.
+    private final Set<String> resourceNames = new HashSet<>();
+    private final Set<String> dataSourceNames = new HashSet<>();
+
     @Override
     public CodegenType getTag() {
         return CodegenType.CLIENT;
@@ -122,6 +127,9 @@ public TerraformProviderCodegen() {
     public void processOpts() {
         super.processOpts();
 
+        // Enable postProcessFile so we can delete non-qualifying API files
+        this.setEnablePostProcessFile(true);
+
         if (additionalProperties.containsKey(PROVIDER_NAME)) {
             providerName = additionalProperties.get(PROVIDER_NAME).toString();
         }
@@ -272,6 +280,14 @@ public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<Mo
         objectMap.put("hasDelete", deleteOp != null);
         objectMap.put("hasList", listOp != null);
 
+        // A tag qualifies as a Terraform resource only if it has a create
+        // operation; without one the resource cannot be instantiated.
+        // A tag qualifies as a data source if it has a read (show) operation.
+        boolean isResource = (createOp != null);
+        boolean isDataSource = (readOp != null);
+        objectMap.put("isResource", isResource);
+        objectMap.put("isDataSource", isDataSource);
+
         // Store CRUD operation details at tag level for simplified template access
         if (createOp != null) {
             objectMap.put("createMethod", createOp.vendorExtensions.get("x-terraform-http-method"));
@@ -312,6 +328,13 @@ public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<Mo
         objectMap.put("resourceName", resourceName);
         objectMap.put("resourceClassName", camelize(resourceName));
 
+        if (isResource) {
+            resourceNames.add(resourceName);
+        }
+        if (isDataSource) {
+            dataSourceNames.add(resourceName);
+        }
+
         // Detect ID field from read operation path params
         String idField = "id";
         if (readOp != null && readOp.pathParams != null && !readOp.pathParams.isEmpty()) {
@@ -354,7 +377,7 @@ public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<Mo
                         attr.put("goType", prop.dataType);
                         attr.put("terraformType", goTypeToTerraformType(prop.dataType));
                         attr.put("terraformAttrType", goTypeToTerraformAttrType(prop.dataType, prop));
-                        attr.put("isRequired", prop.required);
+                        attr.put("isRequired", prop.required && !prop.isReadOnly);
                         attr.put("isComputed", prop.isReadOnly);
                         attr.put("isOptional", !prop.required && !prop.isReadOnly);
                         attr.put("description", prop.description != null ? prop.description : "");
@@ -407,11 +430,19 @@ public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<Mo
                             if ("id".equalsIgnoreCase(prop.baseName)) {
                                 idModelGoName = camelize(prop.baseName);
                                 idModelGoType = prop.dataType;
+                                idResolved = true;
                                 break;
                             }
                         }
                     }
 
+                    if (!idResolved) {
+                        LOGGER.warn("Could not resolve ID field '{}' in response model '{}' for resource '{}'. "
+                                + "The generated code will not compile. Add an '{}' property to the response "
+                                + "schema or use x-terraform-id-field to specify the correct property.",
+                                idField, responseModel, resourceName, idField);
+                    }
+
                     break;
                 }
             }
@@ -482,6 +513,42 @@ public ModelsMap postProcessModels(ModelsMap objs) {
         return objs;
     }
 
+    @Override
+    public void postProcessFile(File file, String fileType) {
+        super.postProcessFile(file, fileType);
+        if (file == null || !file.exists() || !"api".equals(fileType)) {
+            return;
+        }
+
+        String fileName = file.getName();
+
+        if (fileName.endsWith("_resource.go")) {
+            String tag = fileName.substring(0, fileName.length() - "_resource.go".length());
+            if (!resourceNames.contains(tag)) {
+                LOGGER.info("Skipping non-resource file: {}", file.getAbsolutePath());
+                file.delete();
+                return;
+            }
+        }
+
+        if (fileName.endsWith("_data_source.go")) {
+            String tag = fileName.substring(0, fileName.length() - "_data_source.go".length());
+            if (!dataSourceNames.contains(tag)) {
+                LOGGER.info("Skipping non-data-source file: {}", file.getAbsolutePath());
+                file.delete();
+                return;
+            }
+        }
+
+        if (fileName.endsWith("_model.go")) {
+            String tag = fileName.substring(0, fileName.length() - "_model.go".length());
+            if (!resourceNames.contains(tag) && !dataSourceNames.contains(tag)) {
+                LOGGER.info("Skipping unused model file: {}", file.getAbsolutePath());
+                file.delete();
+            }
+        }
+    }
+
     private String goTypeToTerraformType(String goType) {
         if (goType == null) return "types.String";
         switch (goType) {

diff --git a/modules/openapi-generator/src/main/resources/terraform-provider/go.mod.mustache b/modules/openapi-generator/src/main/resources/terraform-provider/go.mod.mustache
@@ -1,4 +1,4 @@
-module {{gitHost}}/{{gitUserId}}/{{gitRepoId}}
+module github.com/teamlumos/knowledge-server
 
 go 1.24.0
 
@@ -7,5 +7,28 @@ toolchain go1.24.4
 require (
 	github.com/hashicorp/terraform-plugin-framework v1.17.0
 	github.com/hashicorp/terraform-plugin-log v0.10.0
-	github.com/hashicorp/terraform-plugin-testing v1.14.0
+)
+
+require (
+	github.com/fatih/color v1.16.0 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/hashicorp/go-hclog v1.6.3 // indirect
+	github.com/hashicorp/go-plugin v1.7.0 // indirect
+	github.com/hashicorp/go-uuid v1.0.3 // indirect
+	github.com/hashicorp/terraform-plugin-go v0.29.0 // indirect
+	github.com/hashicorp/terraform-registry-address v0.4.0 // indirect
+	github.com/hashicorp/terraform-svchost v0.1.1 // indirect
+	github.com/hashicorp/yamux v0.1.2 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mitchellh/go-testing-interface v1.14.1 // indirect
+	github.com/oklog/run v1.1.0 // indirect
+	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
+	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
+	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250707201910-8d1bb00bc6a7 // indirect
+	google.golang.org/grpc v1.75.1 // indirect
+	google.golang.org/protobuf v1.36.9 // indirect
 )
diff --git a/modules/openapi-generator/src/main/resources/terraform-provider/provider.mustache b/modules/openapi-generator/src/main/resources/terraform-provider/provider.mustache
@@ -111,12 +111,12 @@ func (p *{{providerName}}Provider) Configure(ctx context.Context, req provider.C
 
 func (p *{{providerName}}Provider) Resources(_ context.Context) []func() resource.Resource {
 	return []func() resource.Resource{
-{{#apiInfo}}{{#apis}}{{#operations}}		New{{resourceClassName}}Resource,
-{{/operations}}{{/apis}}{{/apiInfo}}	}
+{{#apiInfo}}{{#apis}}{{#operations}}{{#isResource}}		New{{resourceClassName}}Resource,
+{{/isResource}}{{/operations}}{{/apis}}{{/apiInfo}}	}
 }
 
 func (p *{{providerName}}Provider) DataSources(_ context.Context) []func() datasource.DataSource {
 	return []func() datasource.DataSource{
-{{#apiInfo}}{{#apis}}{{#operations}}		New{{resourceClassName}}DataSource,
-{{/operations}}{{/apis}}{{/apiInfo}}	}
+{{#apiInfo}}{{#apis}}{{#operations}}{{#isDataSource}}		New{{resourceClassName}}DataSource,
+{{/isDataSource}}{{/operations}}{{/apis}}{{/apiInfo}}	}
 }