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MySQL supports DELETE with LIMIT and ORDER BY. https://dev.mysql.com/doc/refman/8.0/en/delete.html Before: ``` Post Destroy (1.0ms) DELETE FROM `posts` WHERE `posts`.`id` IN (SELECT `id` FROM (SELECT `posts`.`id` FROM `posts` WHERE `posts`.`author_id` = ? ORDER BY `posts`.`id` ASC LIMIT ?) __active_record_temp) [["author_id", 1], ["LIMIT", 1]] ``` After: ``` Post Destroy (0.4ms) DELETE FROM `posts` WHERE `posts`.`author_id` = ? ORDER BY `posts`.`id` ASC LIMIT ? [["author_id", 1], ["LIMIT", 1]] ```
34 lines
640 B
Ruby
34 lines
640 B
Ruby
# frozen_string_literal: true
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module Arel # :nodoc: all
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class UpdateManager < Arel::TreeManager
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include TreeManager::StatementMethods
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def initialize
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super
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@ast = Nodes::UpdateStatement.new
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@ctx = @ast
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end
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###
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# UPDATE +table+
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def table(table)
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@ast.relation = table
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self
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end
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def set(values)
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if String === values
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@ast.values = [values]
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else
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@ast.values = values.map { |column, value|
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Nodes::Assignment.new(
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Nodes::UnqualifiedColumn.new(column),
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value
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)
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}
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end
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self
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end
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end
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end
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