Partial success handling in Rest API - Mini Project: Build & Apply

Partial Success Handling in REST API Responses

📖 Scenario: You are building a REST API that processes multiple user requests in one call. Sometimes, some requests succeed while others fail. You want to handle this partial success properly and return a clear response.

🎯 Goal: Create a REST API endpoint that accepts a list of user IDs to fetch. The API should process each ID, return data for successful fetches, and report errors for failures in a single JSON response.

📋 What You'll Learn

Create a list of user IDs to fetch

Create a threshold or config variable to simulate failure for certain IDs

Use a loop to process each user ID and collect success or error results

Return a JSON response showing which user data was fetched and which failed

💡 Why This Matters

🌍 Real World

APIs often need to handle multiple requests at once and report which succeeded or failed without stopping the whole process.

💼 Career

Understanding partial success handling is important for backend developers building robust APIs that communicate clearly with clients.

1

DATA SETUP: Create a list of user IDs

Create a list called user_ids with these exact values: [101, 102, 103, 104, 105]

Rest API

# Create a list called user_ids with the values [101, 102, 103, 104, 105]
# Your code here

Need a hint?

Use square brackets to create a list and separate values with commas.

2

CONFIGURATION: Set failure threshold

Create a variable called fail_threshold and set it to 103. This will simulate failure for user IDs greater than this value.

Rest API

user_ids = [101, 102, 103, 104, 105]
# Create a variable fail_threshold and set it to 103
# Your code here

Need a hint?

Just assign the number 103 to the variable fail_threshold.

3

CORE LOGIC: Process user IDs with partial success handling

Create an empty dictionary called results. Use a for loop with variable user_id to iterate over user_ids. For each user_id, if it is less than or equal to fail_threshold, add an entry to results with key user_id and value {'status': 'success', 'data': f'UserData{user_id}'}. Otherwise, add an entry with value {'status': 'error', 'message': 'User not found'}.

Rest API

user_ids = [101, 102, 103, 104, 105]
fail_threshold = 103
# Create an empty dictionary results
# Use a for loop with user_id in user_ids
# Add success or error entries to results
# Your code here

Need a hint?

Use an empty dictionary and a for loop. Use an if-else to decide success or error for each user_id.

4

OUTPUT: Print the JSON response showing partial success

Print the results dictionary.

Rest API

user_ids = [101, 102, 103, 104, 105]
fail_threshold = 103
results = {}
for user_id in user_ids:
    if user_id <= fail_threshold:
        results[user_id] = {'status': 'success', 'data': f'UserData{user_id}'}
    else:
        results[user_id] = {'status': 'error', 'message': 'User not found'}
# Print the results dictionary
# Your code here

Need a hint?

Use print(results) to show the final dictionary.