On 06/20/2017 01:04 PM, Ryan Weinstein wrote:
On Tuesday, June 20, 2017 at 9:53:10 AM UTC-7, Jonathan Vanasco wrote:
you're almost there.
flip a few lines around to rewrite the query to select from
product... e.g. something like
SELECT r_product_list.* FROM r_product_list
JOIN r_product_category_history_list on
r_product_list.r_id=r_product_category_history_list.r_id
JOIN r_product_reviews_historical_details_list on
r_product_list.most_recent_historical_reviews_id=r_product_reviews_historical_details_list.id
<http://r_product_reviews_historical_details_list.id>
then it should be clear how to convert to the sqlalchemy syntax.
The problem is when I do that it doesn't return the correct number of
instances. I need one instance of rProduct per entry into
r_product_category_history_list.
the ORM deduplicates full entities (e.g. mapped objects) when returned
from a Query object. This is so that eager loading schemes don't return
dupes. If you need each object associated with something distinct, add
that to the query:
session.query(Product, product_category_list.some_column)
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http://www.sqlalchemy.org/
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SQLAlchemy -
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http://www.sqlalchemy.org/
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