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Versions: 67
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Contents
module Shipit
class Paginator
def initialize(resources, controller, order: {id: :desc}, max_page_size: 100, default_page_size: 30)
@order = order
@controller = controller
@since = controller.params[:since].presence
page_size = controller.params[:page_size].presence || default_page_size
@page_size = [page_size.to_i, max_page_size].min
@default_page_size = default_page_size
@resources = fetch(resources)
end
def to_a
@resources[0, @page_size]
end
def links
links = {first: link_to(since: nil, page_size: (page_size if page_size != @default_page_size))}
links[:next] = link_to(since: to_a.last.id) unless last_page?
links
end
private
attr_reader :controller, :order, :page_size, :since
def last_page?
@resources.size <= page_size
end
def link_to(params)
controller.url_for(controller.request.parameters.merge(params))
end
def fetch(resources)
scope = resources.order(order).limit(page_size + 1)
if since
column = scope.model.arel_table[order_column]
operator = ascending? ? :gt : :lt
scope = scope.where(column.public_send(operator, since))
end
scope.to_a
end
def order_column
order.keys.first
end
def ascending?
order.values.first.to_sym == :asc
end
end
end
Version data entries
67 entries across 67 versions & 1 rubygems