39 lines
1.3 KiB
Ruby
39 lines
1.3 KiB
Ruby
class ColumnDropper
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def self.drop(table:, after_migration:, columns:, delay: nil, on_remove: nil)
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raise ArgumentError.new("Invalid table name passed to drop #{table}") if table =~ /[^a-z0-9_]/i
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columns.each do |column|
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raise ArgumentError.new("Invalid column name passed to drop #{column}") if column =~ /[^a-z0-9_]/i
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end
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delay ||= Rails.env.production? ? 60 : 0
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sql = <<SQL
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SELECT 1
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FROM INFORMATION_SCHEMA.COLUMNS
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WHERE table_schema = 'public' AND
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table_name = :table AND
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column_name IN (:columns) AND
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EXISTS (
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SELECT 1
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FROM schema_migration_details
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WHERE name = :after_migration AND
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created_at <= (current_timestamp at time zone 'UTC' - interval :delay)
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)
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LIMIT 1
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SQL
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if ActiveRecord::Base.exec_sql(sql, table: table,
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columns: columns,
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delay: "#{delay.to_i || 0} seconds",
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after_migration: after_migration).to_a.length > 0
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on_remove&.call
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columns.each do |column|
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# safe cause it is protected on method entry, can not be passed in params
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ActiveRecord::Base.exec_sql("ALTER TABLE #{table} DROP COLUMN IF EXISTS #{column}")
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end
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end
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end
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end
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