dbt - Advanced Patterns
What happens if you use a dictionary comprehension in dbt Jinja to create a JSON object with duplicate keys from a list of key-value pairs?
What happens if you use a dictionary comprehension in dbt Jinja to create a JSON object with duplicate keys from a list of key-value pairs?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand dictionary behavior in Python/Jinja
When duplicate keys exist, the last assignment overwrites earlier ones.Step 2: Apply to dbt Jinja dictionary comprehension
Creating JSON objects with duplicate keys results in last value winning, no error or list aggregation.Final Answer:
The last value for each duplicate key overwrites previous ones -> Option DQuick Check:
Duplicate keys overwrite previous values in dicts [OK]
Quick Trick: Duplicate keys in dicts overwrite earlier values [OK]
Common Mistakes:
MISTAKES- Expecting error on duplicates
- Thinking duplicates become lists
- Assuming first value is kept
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