Hi. In my application I have a many to many association between Product and Tag schemas which goes through the ProductTag table. Quite straight forward, however, I need to list all products that have ALL the tags in a given list. I really cannot find any answer as to how one can do this. This is what I have so far:
def list_category_products(categories) do from( p in Product, join: pt in ProductTag, on: pt.product_id == p.id, join: t in Tag, on: pt.tag_id == t.id, where: t.name in ^categories ) |> Repo.all() end
Lets assume I have product1 associated with the tag “cake” and product2 associated with the tag “tea”. If I pass only “cake” or only “tea” to the function, I get the correct product, but if I pass both “cake” and “tea”, I get both products where I expect to receive none as none of my products have both tags.
I will appreciate any help or advice. Thank you all in advance.