metamaps--metamaps/app/models/token.rb

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class Token < ApplicationRecord
belongs_to :user
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before_create :assign_token
CHARS = 32
private
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def assign_token
self.token = generate_token
end
def generate_token
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loop do
candidate = SecureRandom.base64(CHARS).gsub(/\W/, '')
return candidate[0...CHARS] if candidate.size >= CHARS
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end
end
end