compwron

Disclaimer: This took the work of lots of smart people to track down. I did not discover this on my own and do not deserve the credit for it.

Symptom:

(NoMethodError) "undefined method `fields' for nil:NilClass"

Observed while using rails v3.2.19 - https://github.com/rails/rails/blob/v3.2.19/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

Easy fix:

compwron

def initialize(field_data)
    field_data.each do |name, value|
    instance_variable_set("@#{name}", value)
  end
end

compwron

# You are asked to write a max_slice function which takes as an input an array of integers, and returns the slice with the largest sum of the elements

a = [1, 2, 3, 4, 5]

b = [1, -2, 6, -4, 5]
[1]
[1, -2]
[1, -2, 6]
[-2, 6]

compwron

filename = ARGV[0] || 'app/models/transaction.rb'
f = File.open(filename, 'rb')
c = f.read
all = c.split(/\n|,/).map { |i| i.strip.gsub(/[^A-Za-z0-9\s\[\]\._\(\)]/, '') }.reject(&:empty?)
# too many false positives

DEFAULT = 'aaa --- DEFAULT --- '
alph_list = [DEFAULT]
all.each do |line|
  if [alph_list.last, line].sort.last == line # this line is after everything in alph list alphabetically

compwron

# Task: write a function to determine if a string is
# 'balanced'. Balanced means that opening and closing
# brackets match each other in the proper order. Other
# characters are possible and should be handled. The 
# possible characters for balancing are {}, (), and []
 
# Example Input:
 
# '{}' -> True
# '{[]}' -> True

compwron

  def sum2 choices, result
    arrays = []
    choices.each_with_index {|i, index|
      choices.each_with_index {|j, index2|
        break if index == index2
         arrays << [i, j] if i + j == result
        }
      }
    arrays
  end

compwron

def max_devi(choices, setlength) # v, d
  largest_diff = 0
  largest_diff_subset = []
  (0..choices.length - setlength).each do|i|
    subset = choices[i..i + setlength]
    diff = subset.max - subset.min
    if diff > largest_diff
      largest_diff_subset = subset
      largest_diff = diff
    end

compwron

class OrbitalCoordinate
	def initalize(lat, long, altit)
		@lat = lat
		@long = long
		@altit = altit
		# @veloc = veloc # meters per second
		# how many seconds it will take to get to another point.
		OrbitalVelocity..new(sec, OrbitalCoordinate) 
	end
end

compwron

l = [
  "John",
  "John",
  "John",
  "John",
  "Adam",
  "Adam",
  "Adam",
  "Linda",

compwron

xits = `grep -Rwn "xit |skip" spec | grep " do"`.split("\n")
skips = `grep -Rwn "skip " spec | grep -v ".js" | grep -v ":skip"`.split("\n")
 
blame_cmds = (xits + skips).map {|x| 
	pieces = x.split(":")
	file = pieces[0]
	line_num = pieces[1]
	[x, "git blame -L#{line_num},+1 -- #{file}"]
}