Adding additional parameters to those passed from the form?

Question

MongoDB

I have parameters -> name and domain passed from the form and I need to send some other data with them, for example timezone (params.require(:project).permit(:name, :domain).merge!(timezone: timezone)). At the same time, it is necessary to describe the timezone in the model. it is not in the table. When adding field :timezone, you need to add include Mongoid::Document and here it appears: ru.mongoid.errors.messages.unknown_attribute.resolution.
Can you tell me what could be the reason? How to solve this problem?