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30 lines
725 B
Ruby
30 lines
725 B
Ruby
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# frozen_string_literal: true
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module RankedTrend
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extend ActiveSupport::Concern
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included do
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scope :by_rank, -> { order(rank: :desc) }
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scope :ranked_below, ->(value) { where(rank: ..value) }
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end
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class_methods do
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def recalculate_ordered_rank
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connection
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.exec_update(<<~SQL.squish)
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UPDATE #{table_name}
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SET rank = inner_ordered.calculated_rank
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FROM (
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SELECT id, row_number() OVER w AS calculated_rank
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FROM #{table_name}
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WINDOW w AS (
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PARTITION BY language
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ORDER BY score DESC
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)
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) inner_ordered
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WHERE #{table_name}.id = inner_ordered.id
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SQL
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end
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end
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end
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