monkeypatch.rb

module ActiveRecord::ConnectionAdapters::PostgreSQLColumn::Cast

  # See https://github.com/rails/rails/pull/11477
  def quote_and_escape(value)
    case value
    when "NULL"
      value
    else
      "\"#{value.gsub(/(["\\])/, '\\\\\1')}\""
    end
  end

  # See https://github.com/rails/rails/pull/11159
  def array_to_string(value, column, adapter, should_be_quoted = false)
    casted_values = value.map do |val|
      if val == "NULL"
        "\"#{val}\""
      elsif Array === val # Special handling of multidimensional arrays
        adapter.type_cast(val, column, true)
      else
        casted_val = adapter.type_cast(val, column, true)

        if String === casted_val
          quote_and_escape(casted_val)
        else
          casted_val
        end
      end
    end
    "{#{casted_values.join(',')}}"
  end
end