43 lines
751 B
Ruby
43 lines
751 B
Ruby
class ShortId
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attr_accessor :klass, :generation_attempts
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def initialize(klass)
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self.klass = klass
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self.generation_attempts = 0
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end
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def generate
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until (generated_id = candidate_id) && generated_id.valid? do
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self.generation_attempts += 1
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raise 'too many hash collisions' if generation_attempts == 10
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end
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generated_id.to_s
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end
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def candidate_id
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CandidateId.new(klass)
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end
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private
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class CandidateId
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attr_accessor :klass, :id
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def initialize(klass)
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self.klass = klass
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self.id = generate_id
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end
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def to_s
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id
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end
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def generate_id
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Utils.random_str(6).downcase
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end
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def valid?
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!klass.exists?(short_id: id)
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end
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end
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end
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