58 lines
1.5 KiB
Ruby
58 lines
1.5 KiB
Ruby
# frozen_string_literal: true
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require_relative '../../migration_helpers'
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module RuboCop
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module Cop
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module Migration
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# Cop that checks if `drop_table` is called in deployment migrations.
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# Calling it in deployment migrations can cause downtimes as there still may be code using the target tables.
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class DropTable < RuboCop::Cop::Cop
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include MigrationHelpers
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MSG = <<-MESSAGE.delete("\n").squeeze
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`drop_table` in deployment migrations requires downtime.
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Drop tables in post-deployment migrations instead.
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MESSAGE
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def on_def(node)
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return unless in_deployment_migration?(node)
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return if down_method?(node)
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node.each_descendant(:send) do |send_node|
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next unless offensible?(send_node)
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add_offense(send_node, location: :selector)
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end
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end
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private
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def down_method?(node)
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node.method?(:down)
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end
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def offensible?(node)
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drop_table?(node) || drop_table_in_execute?(node)
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end
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def drop_table?(node)
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node.children[1] == :drop_table
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end
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def drop_table_in_execute?(node)
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execute?(node) && drop_table_in_execute_sql?(node)
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end
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def execute?(node)
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node.children[1] == :execute
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end
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def drop_table_in_execute_sql?(node)
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node.children[2].to_s.match?(/drop\s+table/i)
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end
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end
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end
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end
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end
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