postgresql - How to get unique records from Active Record rails 4 based on a column -

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i have following models

customer

payments: customer_id, customer_sign_up, :more_columns

now want 1 payment per customer_id.. please remember have many records, , need performance / best way this.

this gets me customer_ids:

payment.unscoped.where(:customer_sign_up => 1.year.ago..date.today).uniq.pluk(:customer_id)

this did not work either:

# #payment.unscoped.where(params[:type].to_sym =>        #               date.parse(params[:start])..date.parse(params[:end])       #             ).group(["customer_id", "payments.id"]).order("customer_id desc").select("distinct(customer_id), payments.*")

i want entire rows of payment.

added comment: dont want 1 payment. 1 payment per customer_id:

payments: amount, sign_up, customer_id

each customer can have many payments. , each customer have many payments sure.

and dont want search on customer rather on payments , filter out records there.

customer.payments.where(:customer_sign_up => 1.year.ago..date.today).order("created_at.desc").first

i've gone recent here order field, can adjust whatever want use criteria choosing single payment.


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