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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