Many associations for reading the data from large tables will always kill 
the performance of the application...

If there are too many joins between tables I do prefer flat table read only 
data table rather on the transactional database..

Simple SQL Query for the same...

select *
from courses c, lessons l, topics t
where c.id = l.class_id 
AND l.id = t.topic_id
AND t.recipe_id IS NOT NULL


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