HELP:

I have the following scenario: many-to-many association of Customers to products. I have a join table, customer_product_link. But I have attributes that are associated with the customer_product_link table like the created datetime of the linkage. How do I update this datetime attribute???

customer
----------
customer_id

product
---------
product_id

customer_product_link
-------------------------
customer_id
product_id
createdDate ***

I can map the bi-directional association fine but can't find any info to update the link tables. HELP

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