hash with array rails not chain value but delete

Question

I've tried to insert some Values into this hash were every key is an array but when I print all result just the last value

def self.hash_builder(query)

       statistic = Hash.new { |hash, key| hash[key] = [] }    

          if !query.empty?

            query.each do |q|

              statistic[:sell].push(q.total_sell.to_i)
              statistic[:price].push(q.total_price.to_f)

            end
          else
            statistic[:sell].push(0)
            statistic[:price].push(0.0)

          end

        return statistic
end

I call this method after make a query, and I send to this the query with the new params, but every time i see inside this hash just the last query value

THIS IS THE RESULT

Works for me. Can you show the value of query at the top of the method? — Amadan
– Amadan, Commented Dec 2, 2015 at 1:06
Please show the output of puts query.inspect or similar (in text); not a screenshot of your app, as we don't know what you did to produce the screenshot. — Amadan
– Amadan, Commented Dec 2, 2015 at 1:19
@Gene: Array#push and Array#<< are almost identical, where one works the other should too (except for the valence of push). — Amadan
– Amadan, Commented Dec 2, 2015 at 1:20

Gene · Accepted Answer · 2015-12-02 01:23:33Z

1

I'll answer here because the comment section doesn't allow enough room. You're wrong about <<. It ought to work fine.

$ irb
irb(main):001:0> s = Hash.new {|h, k| h[k] = [] }
=> {}
irb(main):002:0> s[:sell] << 1
=> [1]
irb(main):003:0> s[:sell] << 2
=> [1, 2]
irb(main):004:0> s[:sell]
=> [1, 2]
irb(main):005:0> s[:price]
=> []

But push should work, too.

irb(main):006:0> s[:sell].push(3)
=> [1, 2, 3]

edited Dec 2, 2015 at 1:23

answered Dec 2, 2015 at 1:18

Gene

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1 Comment

Alessio.Bussolari Over a year ago

I see the problem, every times when i call the model I re-initialize the Hash for that i delete every times the old values. Thanks !!! A lot !!! with your terminal screen I see my error !!!

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