Hello everyone, this is really urgent so ill be quick, here is some ruby
code that i know works:
require 'csv'
class Motorcycle
attr_reader :name, :weight
@@count = 0
def self.find (name)
found = nil
ObjectSpace.each_object(Motorcycle) { |o|
found = o if o.name == name
}
return found
end
def self.create
File.new('motorcycles.csv').readlines[1..-1].map{ |line|
Motorcycle.new( *line.split( ',' ) )
}
end
def initialize (name, weight)
@name = name
@weight = weight
self.class.count += 1
end
def self.count
return @@count
end
def self.count=( count )
@@count = count
end
def available_colors
colors=[]
colorsFile = File.read('colors.csv').split("\n").map { |line|
line.split(',') }
for i in (0..colorsFile.flatten.length) do
if (colorsFile.flatten[i].to_s == self.name.to_s)
colors.push(colorsFile.flatten[i+1])
end
end
return colors
end
def contains (name,color)
if(self.name.to_s == name)
else
return color
end
end
def has_abs?
File.open( 'abs.txt' ) do |io|
io.each {|line| line.chomp! ; return true if line.include?
self.name.to_s}
end
return false
end
end
Motrocicle.create
the code must pass this tests on rspec:
describe Motorcycle do
describe "loading the motorcycle list" do
it "should load 2 motorcycles from the CSV" do
Motorcycle.count.should == 2
end
end
describe "finding a motorcycle by name" do
it "should return an instance of the Motorcycle class" do
Motorcycle.find("1200 RT").should be_a Motorcycle
end
end
describe "#weight" do
it "should have a weight of 800 pounds for the 1200 RT" do
Motorcycle.find("1200 RT").weight.should == '800 pounds'
end
it "should have a weight of 500 pounds for the 600 GS" do
Motorcycle.find("600 GS").weight.should == '500 pounds'
end
end
describe "#available colors" do
it "should find 'red' and 'black' as available colors for the
BMW 1200 RT" do
Motorcycle.find("1200 RT").available_colors.should == [ 'red',
'black' ]
end
it "should find 'green' and 'blue' as available colors for the
BMW 600 GS" do
Motorcycle.find("600 GS").available_colors.should == [
'green', 'blue' ]
end
end
describe "#has_abs?" do
it "should be true for a motorcycle that appears in
abs_motorcycles.txt" do
Motorcycle.find("1200 RT").has_abs?.should be_true
end
it "should be false for a motorcycle that does not appear in
abs_motorcycles.txt" do
Motorcycle.find("600 GS").has_abs?.should be_false
end
end
end
problem is, after the first test (where it counts the amount of
motrocicle instances) every instance is a nil, thats t say, every test
is failed except for the fist one. here is the output log:
Failures:
1) Motorcycle finding a motorcycle by name should return an
instance of the Motorcycle class
Failure/Error: Unable to find matching line from backtrace
expected nil to be a kind of Motorcycle
# ./motoapp.rb:76
2) Motorcycle#weight should have a weight of 800 pounds for the
1200 RT
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `weight' for nil:NilClass
# ./motoapp.rb:82
3) Motorcycle#weight should have a weight of 500 pounds for the
600 GS
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `weight' for nil:NilClass
# ./motoapp.rb:86
4) Motorcycle#available colors should find 'red' and 'black' as
available colors for the BMW 1200 RT
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `available_colors' for nil:NilClass
# ./motoapp.rb:92
5) Motorcycle#available colors should find 'green' and 'blue' as
available colors for the BMW 600 GS
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `available_colors' for nil:NilClass
# ./motoapp.rb:96
6) Motorcycle#has_abs? should be true for a motorcycle that
appears in abs_motorcycles.txt
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `has_abs?' for nil:NilClass
# ./motoapp.rb:102
7) Motorcycle#has_abs? should be false for a motorcycle that does
not appear in abs_motorcycles.txt
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `has_abs?' for nil:NilClass
# ./motoapp.rb:106
Finished in 0.01223 seconds
8 examples, 7 failures
i have been inclined to think this is some kind of bug or something due
to my result doing the manual test like this:
puts Motorcycle.count
puts Motorcycle.find("1200 RT")
puts Motorcycle.find("1200 RT").weight
puts Motorcycle.find("600 GS").weight
puts Motorcycle.find("1200 RT").available_colors
puts Motorcycle.find("600 GS").available_colors
puts Motorcycle.find("1200 RT").has_abs?
puts Motorcycle.find("600 GS").has_abs?
which give me this output:
2
#<Motorcycle:0x7fd8bffcfd88>
800 pounds
500 pounds
red
black
green
blue
true
false
so i'm really pretty much on a dead end, ¿does anyone have a clue as to
what could be happening?.
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