ruby on rails - Different sort order for has_many :through relation -

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i have following models set - 

product has_many categories through categorisations category has_many products through categorisations

i'm wondering correct way put products in different orders in each category. example, product might first in 1 category , last in another. ordering based purely on item appropriate in each category, rather alphabetical etc.

any suggestions welcome!

in categorisation model add column 'sort_order'.

also add following in categorisations model.

default_scope order("sort_order asc")

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