Fix variable passing

Signed-off-by: Alex Eftimie <alex.eftimie@getyourguide.com>

plugins/scaffolder-backend/src/scaffolder/tasks/NunjucksWorkflowRunner.test.ts

@@ -574,7 +574,7 @@ describe('DefaultWorkflowRunner', () => {
   });
 
   describe('each', () => {
-    it('should run a step repeatedly', async () => {
+    it('should run a step repeatedly - flat values', async () => {
       const task = createMockTaskWithSpec({
         apiVersion: 'scaffolder.backstage.io/v1beta3',
         steps: [
@@ -583,7 +583,7 @@ describe('DefaultWorkflowRunner', () => {
             name: 'name',
             each: '${{parameters.colors}}',
             action: 'jest-mock-action',
-            input: { color: '${{each}}' },
+            input: { color: '${{each.value}}' },
           },
         ],
         output: {},
@@ -604,6 +604,68 @@ describe('DefaultWorkflowRunner', () => {
         expect.objectContaining({ input: { color: 'red' } }),
       );
     });
+
+    it('should run a step repeatedly - object list', async () => {
+      const task = createMockTaskWithSpec({
+        apiVersion: 'scaffolder.backstage.io/v1beta3',
+        steps: [
+          {
+            id: 'test',
+            name: 'name',
+            each: '${{parameters.settings}}',
+            action: 'jest-mock-action',
+            input: {
+              key: '${{each.key}}',
+              value: '${{each.value}}',
+            },
+          },
+        ],
+        output: {},
+        parameters: {
+          settings: [{ color: 'blue' }],
+        },
+      });
+
+      await runner.execute(task);
+
+      expect(fakeActionHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          input: { key: '0', value: { color: 'blue' } },
+        }),
+      );
+    });
+
+    it('should run a step repeatedly - object', async () => {
+      const task = createMockTaskWithSpec({
+        apiVersion: 'scaffolder.backstage.io/v1beta3',
+        steps: [
+          {
+            id: 'test',
+            name: 'name',
+            each: '${{parameters.settings}}',
+            action: 'jest-mock-action',
+            input: { key: '${{each.key}}', value: '${{each.value}}' },
+          },
+        ],
+        output: {},
+        parameters: {
+          settings: { color: 'blue', transparent: 'yes' },
+        },
+      });
+
+      await runner.execute(task);
+
+      expect(fakeActionHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          input: { key: 'color', value: 'blue' },
+        }),
+      );
+      expect(fakeActionHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          input: { key: 'transparent', value: 'yes' },
+        }),
+      );
+    });
   });
 
   describe('secrets', () => {

plugins/scaffolder-backend/src/scaffolder/tasks/NunjucksWorkflowRunner.ts

@@ -315,7 +315,9 @@ export class NunjucksWorkflowRunner implements WorkflowRunner {
       const iterations = new Array<JsonValue>();
       if (step.each) {
         const each = await this.render(step.each, context, renderTemplate);
-        iterations.push(...each);
+        iterations.push(
+          ...Object.keys(each).map((key: any) => [key, each[key]]),
+        );
       } else {
         iterations.push({});
       }
@@ -324,13 +326,16 @@ export class NunjucksWorkflowRunner implements WorkflowRunner {
       for (const iteration of iterations) {
         if (step.each) {
           taskLogger.info(`Running step each: ${iteration}`);
-          context.each = iteration;
+          const iterationContext = {
+            ...context,
+            each: { key: iteration[0], value: iteration[1] },
+          };
           // re-render input with the modified context that includes each
           actionInput =
             (step.input &&
               this.render(
                 step.input,
-                { ...context, secrets: task.secrets ?? {} },
+                { ...iterationContext, secrets: task.secrets ?? {} },
                 renderTemplate,
               )) ??
             {};