[Rails] how is mongoid syntax implemented ?

In mongoid, a ORM mapped database object is like below. The part "type: String" seems to me to not fit into any standard ruby syntax and I was curious how does mongoid implement that ?


class Step
  include Mongoid::Document

  field :Label, type: String
  field :Descript, type: String
  field :ErrorText, type: String
 
  embedded_in :step_data

end

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