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# frozen_string_literal: true
class PreviewCardFilter
KEYS = %i(
trending
).freeze
attr_reader :params
def initialize(params)
@params = params
end
def results
scope = PreviewCard.unscoped
params.each do |key, value|
next if key.to_s == 'page'
scope.merge!(scope_for(key, value.to_s.strip)) if value.present?
end
scope
end
private
def scope_for(key, value)
case key.to_s
when 'trending'
trending_scope(value)
else
raise "Unknown filter: #{key}"
end
end
def trending_scope(value)
ids = begin
case value.to_s
when 'allowed'
Trends.links.currently_trending_ids(true, -1)
else
Trends.links.currently_trending_ids(false, -1)
end
end
if ids.empty?
PreviewCard.none
else
PreviewCard.joins("join unnest(array[#{ids.map(&:to_i).join(',')}]::integer[]) with ordinality as x (id, ordering) on preview_cards.id = x.id").order('x.ordering')
end
end
end
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