Clean trailing newlines and spaces from structure.sql after dumping

structure_dump_cleanup.rb

# config/initializers/structure_dump_cleanup.rb
# Clean trailing newlines and spaces from SQL schema dump file after dumping
module StructureDumpWhitespaceCleanup
  def structure_dump(cfg, fn, *) = super.tap{ @dump_file = fn }

  def dump_schema(...)
    super.tap do
      next unless fn = @dump_file
      File.write fn, File.read(fn).gsub(/[ \t]+\n/, "\n").sub(/\s+\n\z/, "\n")
    end
  end
end

class << ActiveRecord::Tasks::DatabaseTasks
  prepend StructureDumpWhitespaceCleanup
end