ruby on rails - How to order associated columns case insensitive -


i'm trying order projects customer company names, error: pg::undefinedtable: error: missing from-clause entry table "customers" line 1: ... "projects"."archived" = $1 order lower(customers.... ^ : select "projects".* "projects" "projects"."archived" = $1 order lower(customers.company) asc.

this how tried far:

projects = project.includes(:customer).order("lower(customers.company) asc")

if leave out lower(…) works fine.

you need write using references.

project.includes(:customer)        .order("lower(customers.company) asc")        .references(:customers)

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