[RUBY] How to write to apply gem Pagy (pagination) to an array

When creating an application in rails API mode, I used a gem called Pagy for pagination. At that time, I was confused about how to write it, so I will leave it here as a memo.

Description to apply to the array

pagy, offices = pagy_array([])

How to apply normally

$ pagy, offices = pagy Office.where(city_id: params[:city_id])

pagy, offices = pagy(Office.all)

Description of HTTP header

pagy_headers_merge(pagy)

If you add this below the above description, you can add pagination information to the HTTP header.

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