Debugging Analytic Apps

1. The Two Modes of Testing

There are two primary ways to run and test an Analytic App in Alteryx Designer:

1. As an Analytic App (Wizard Mode): By clicking the "wand" icon next to the standard Run button, you launch the app in its final form, just as an end-user would see it. This is great for testing the overall user experience.
2. Using the Test View (Developer Mode): Inside the Interface Designer (Ctrl+Alt+D), there is a Test tab. This view is your development sandbox, providing the tools you need not just to test values, but to dive deep into the workflow's execution.

While running the app in Wizard Mode is important, the Test View is where true debugging happens.

2. Opening the Hood with "Open Debug"

The most powerful feature within the Test View is the Open Debug button. When you enter test values into your app's questions and click this button, Alteryx creates a temporary, standard workflow (.yxmd) in a new tab. This new workflow is a snapshot of your app, configured exactly as it would be based on the test inputs you provided. This lets you see what's happening "under the hood."

Let's review the official documentation to understand this process more formally.

As the documentation states, the debug workflow is a duplicate of your app's workflow, but with two key differences:

• The Interface Tools (like Drop Downs, Text Boxes) are gone.
• The standard workflow tools have been updated by the Action tools, based on the values you entered in the Test View.

This gives you a plain workflow that you can inspect, modify, and run to find out exactly where things are going wrong.

3. Working within the Debug Workflow

Once you click "Open Debug," a new tab appears containing your debug workflow. At first glance, it looks very similar to your original app design. However, there are crucial elements and considerations for using it effectively.

The text box at the top is your first point of reference. It contains:

• App Values: A list of the inputs you provided in the Test View.
• Actions Log: A record of which actions were triggered. This is especially useful for debugging Condition tools, as it will tell you if the condition was met.

A debug workflow is a temporary environment. To use it for troubleshooting, you often need to make a few small adjustments.

Let's summarize and expand on these critical points for effective debugging:

1. Run the Workflow: The debug workflow is created but has not been run. You must click the Run button to see the data flow through it.
2. Add Browse Tools: The original Browse tools from your workflow are not included in the debug version. To see the data at any point, you must manually add a Browse tool and re-run the workflow. This is the most common and important debugging action.
3. Inspect Tool Configurations: The whole point of the debug workflow is to see if your Action tools worked. Click on the tool that was supposed to be updated (e.g., a Filter tool) and check its configuration in the Configuration window.
4. Ignore Annotations: Remember that tool annotations are static. An annotation on a Filter tool will still show the original filter condition, not the updated one. Always trust the Configuration window, not the annotation.
5. Check File Paths: If your app reads or writes files, ensure the paths are correct. If you used relative paths in the original app, they might be broken in the temporary debug workflow.

4. A Practical Debugging Scenario

Let's walk through a common problem.

The Problem: You've built an app where the user selects a product Category from a Drop Down tool. This choice should update a Filter tool to pass only records from that category. However, when you run the app and select "Furniture," the output file still contains all categories.

The Debugging Process:

1. Open the app workflow (.yxwz). Go to View -> Interface Designer to open the designer window.
2. Navigate to the Test tab.
3. Find the question "Select a Category:" and choose "Furniture" from the list.
4. Click Open Debug. A new workflow tab appears.
5. Step 1: Inspect the configuration. Click on the Filter tool in the new debug workflow. Look at its configuration.
   • Hypothesis: The filter expression is likely still set to its original default value (e.g., [Category] == "Office Supplies") instead of being updated to [Category] == "Furniture". This tells you immediately that the Action tool connecting the Drop Down to the Filter is not configured correctly.
6. Step 2: Confirm with data. To be absolutely sure, add a Browse tool after the Filter tool in the debug workflow.
7. Step 3: Run the workflow. Click the Run button.
8. Step 4: Analyze the result. Check the output of the Browse tool. You will see that records for all categories (or the default category) are flowing through, confirming that the filter is not working as intended.
9. The Fix: Go back to your original app workflow. Find the Action tool and correct its configuration. Most likely, you need to adjust what part of the filter expression it is updating. After fixing it, you can repeat the debug process to confirm it now works.

This systematic process—Test, Open Debug, Inspect, Add Browse, Run—is the foundation of efficient app debugging in Alteryx.

Conclusion

Today we've learned how to ensure our analytic apps are not just well-designed, but also robust and reliable. By mastering the debugging cycle, you can quickly diagnose and fix issues, building confidence in your apps before you share them.

Key Takeaways:

• The Test View in the Interface Designer is your primary environment for testing and debugging.
• The Open Debug button creates a standard, runnable workflow based on your test inputs.
• In a debug workflow, you must manually add Browse tools and run the workflow to see results.
• The most important step is to inspect the configuration of tools that should have been updated by an Action tool.
• The Debug Log at the top of the debug workflow provides valuable information on the app values and actions taken.

In our next lesson, we will cover the final step in the app lifecycle: Package an analytic app (.yxwz) for sharing and deployment. This will allow you to share your finished, debugged app with other Alteryx users.