that are the modified models which works for me

class Province
      include DataMapper::Resource

      property :name_short, String, key: true, length: 2, unique: true
      property :name_long,  String, length: 1..50

      has n, :municipalities, 'Municipality'#,
      #  parent_key: [:name_short],
      #  child_key: [:province]
    end

    class Municipality
      include DataMapper::Resource

#      property :province,            String, key: true, length: 2
      property :name,                String, key: true, length: 1..40
      property :lat,                 Float
      property :long,                Float

      property :current_population,  Integer

      belongs_to :province, 'Province'#,
#        parent_key: [:name_short],
 #       child_key: [:province]

    end

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