Ruby on Rails

My Booking model has: serialize :custom_data, Hash

From the console it works as expected saving values to the custom_data attribute.

But when having a form with parameters like this: booking[custom_data][hello] and creating a new object in the controller like this: Booking.new( params[:booking] ), values are saved in the database with added metadata like this: --- !ruby/hash:ActiveSupport::HashWithIndifferentAccess

How can get rid of the HashWithIndifferentAccess-metadata when saving from a form?

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