32651: ERROR comparación de Float con Float Falló Ruby

Question

Soy nuevo en los rieles, y me aparece un error y parece que no pude encontrar el problema. Aquí está el registro:

[32651:ERROR] 2012-10-09 13:46:52 :: comparison of Float with Float failed 
[32651:ERROR] 2012-10-09 13:46:52 :: /home/sunny/backend/lib/analytics/lifetime.rb:45:in `each' 
/home/sunny/backend/lib/analytics/lifetime.rb:45:in `max' 
/home/sunny/backend/lib/analytics/lifetime.rb:45:in `max_growth' 
/home/sunny/backend/lib/analytics/lifetime.rb:15:in `run' 
/home/sunny/backend/lib/analytics/post_analytics.rb:102:in `lifetime' 
/home/sunny/backend/lib/analytics/post_analytics.rb:27:in `run`run' 
lib/endpoints/posts/index.rb:65:in `block in response' 
lib/endpoints/posts/index.rb:62:in `each' 
lib/endpoints/posts/index.rb:62:in `response' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/api.rb:163:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/rack/validation/required_param.rb:43:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/rack/params.rb:61:in `block in call' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/rack/validator.rb:40:in `safely' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/rack/params.rb:59:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/rack/async_middleware.rb:73:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:114:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/async-rack-0.5.1/lib/async_rack/async_callback.rb:91:in `block in new' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/request.rb:163:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/goliath-1.0.0.beta.1/lib/goliath/request.rb:163:in `block in process' 

Cada vez que voy al archivo y encontrar esa fila, no hay each, y no puedo entender dónde está el problema. ¿Alguien puede ayudar? Más que una solución, quiero entender el problema.

Aquí está el archivo:

class Lifetime 
    attr_reader :values 

    GROWTH_CUT_OFF = 0.10 

    def initialize(engaged_users_values) 
    @values = engaged_users_values 
    end 

    def run 
    growths  = growth(values) 

    return [0] if growths.uniq.first == 0 || growths.empty? 

    max_growth = max_growth(growths) 
    dead_growth = least_growth(growths, max_growth) 

    time_diff = time_diff(values.last['end_time'], 
          values.first['end_time']) 
    return [time_diff] unless dead_growth 

    dead_loc  = growths.index(dead_growth) 
    dead_value = values[dead_loc] 
    lifetime(values.first, dead_value) 
    end 

    def time_diff(last, first) 
    in_minutes(parse_time(last)-parse_time(first)) 
    end 

    def parse_time(time) 
    DateTime.parse(time) 
    end 

    def growth(values) 
    values.each_cons(2).map do |one, two| 
     one_value = one['value'].to_f 
     two_value = two['value'] 

     ((two_value-one_value)/(one_value)*100).round(2) 
    end 
    end 

    def max_growth(growths) 
    growths.max 
    end 

    def least_growth(growths, max_growth) 
    growth_cut = growth_cut(max_growth) 
    growths.select {|g| g <= growth_cut}.first 
    end 

    def growth_cut(max_growth) 
    max_growth*GROWTH_CUT_OFF 
    end 

    def lifetime(first_value, last_value) 
    first = parse_time(first_value['end_time']) 
    last = parse_time(last_value['end_time']) 

    result = last-first 
    [in_minutes(result)] 
    end 

    def in_minutes(time) 
    time.to_f*24*60 
    end 
end 

Answer 1

Si uno de los dos flotadores es NaN, entonces obtendrá este mensaje. Entonces, evita el caso NaN.

Podemos darle más información si usted pone el código exacto del error (el método max_growth)