ruby - 特定键的 transform_value[1]

Question

I am trying for each row to compare the fx value of each corresponding name; So the outcome should be: diff={"name"=>"XPT", "fx"=>"1.1315313597682419"} or rounded before having to be compared _ if it is easier to get it that way: diff={"name"=>"XPT", "fx"=>"1.13153"}

So far I have a TypeError (no implicit conversion of String into Integer) with the following:

def compare_values
    diff = {}
    a = [{"src"=>"reportStack"},
    {"name"=>"XPT", "fx"=>"1.1315313597682419"},
    {"name"=>"XAU", "fx"=>"27.0165670831070071"},
    {"name"=>"XAG", "fx"=>"8.4192241535397429"}]

    b = [{"src"=>"reportOverflow"},
    {"name"=>"XPT", "fx"=>"1.13163"},
    {"name"=>"XAU", "fx"=>"27.0165670831070071"},
    {"name"=>"XAG", "fx"=>"8.4192"}]

    b.each do |b_row|
       a.each do |a_row|
          b.each do |k,v|
            diff = k if a_row['name'].value == e_row['name'].value && a_row['fx'].value.to_f != a_row['fx'].value.to_f
          end
      end
    end
end

Could anyone please give a tip how to handle this pickle?

Answer 1

I would begin by simplifying the data structures for both reportStack (a) and reportOverflow (b) into hashes, where the key is name , and the value is fx . This will allow us to compare key-value pairs without having to iterate through an array and checking each value.

report_stack = a.inject(Hash.new) do |memo, report_stack_entry|
  next memo unless report_stack_entry['name']

  memo[report_stack_entry['name']] = report_stack_entry['fx']
  memo
end

# report_stack => {"XPT"=>"1.1315313597682419", "XAU"=>"27.0165670831070071", "XAG"=>"8.4192241535397429"}

report_overflow = b.inject(Hash.new) do |memo, report_overflow_entry|
  next memo unless report_overflow_entry['name']

  memo[report_overflow_entry['name']] = report_overflow_entry['fx']
  memo
end

# report_overflow => {"XPT"=>"1.13163", "XAU"=>"27.0165670831070071", "XAG"=>"8.4192"}

I would then .reject over report_stack with a ?nil? , start_with? , and == condition on the corresponding report_overflow key

diff = report_stack.reject do |name, fx|
  overflow_fx = report_overflow[name]

  !overflow_fx.nil? && (
    fx == overflow_fx ||
    fx.start_with?(overflow_fx)
  )
end

diff #=> {"XPT"=>"1.1315313597682419"}

If any additional comparison logic is required, you should be able to easily update the condition in the .reject block to do so.