just learning ruby.
I have two folders inside my directory:
"lib" and "test"
Inside lib\person.rb:
class Person
attr_accessor :name
def introduction
"Hello, my name is #{name}!"
end
end
Inside test\test_person.rb:
require 'minitest/autorun'
require 'person'
class TestPerson < Minitest::Test
def test_introduction
person = Person.new
person.name = 'Bob'
assert(person.introduction == 'Hello, my name is Bob!')
end
end
When I try to run: ruby -I lib test/test_person.rb I get the following error:
(...) cannot load such file -- person (LoadError) (...)
The -I argument seems that is not working. I get the same error without it.
Any clue?
Tnks
Ok, just figure out what is going on...
I am Brazilian, and we have special characters for accents.
My folder name had one of this "ê".
Ruby is able to load the lib. But not able to recall it.
D:\OneDrive\Documentos\Documentos Felipe\Assuntos Acadêmicos>irb -I lib
irb(main):001:0> $:
=> ["D:/OneDrive/Documentos/Documentos Felipe/Assuntos Acad\x88micos/lib",(...)
\x88 = ê
Changed the folder name. Now it is ok.
If anyone knows how to solve this without worry about the name, would be helpful.
Tnks!
Related
Hi I am new to ruby and have recently started learning the same.I have written below ruby program which runs perfectly.
But this all program is written in a single file.I want to place each class in a different file and use one more file to execute all.ie like we do in java.[One main method to start the program] How can i run this program like this.
When i tried keeping each class in individual file and tried executing the same it started giving errors like method not found.
class Vehical
attr_accessor :odometer
attr_accessor :gas_used
def accelrate
puts " Floor It"
end
def sound_horn
puts "Beep! Beep!"
end
def steer
puts "Turn front 2 wheels"
end
def mileage
#odometer /#gas_used
end
end
class Truck < Vehical
end
class Motercycle < Vehical
end
class Car < Vehical
end
truck = Truck.new
truck.steer
car = Car.new
car.odometer = 11432
car.gas_used = 366
puts "Lifetime MPG:"
puts car.mileage
Below are few options:
Use require_relative to load those files into main file.
require_relative "vehical"
require_relative "truck"
require_relative "motor_cycle"
require_relative "car"
Use $:.unshift File.dirname(__FILE__) in main file to add its location to Ruby Load path, and use require "dependent-file-name-without-extension" in main file.
$:.unshift File.dirname(__FILE__)
require "vehical"
require "truck"
require "motor_cycle"
require "car"
Use -I <folder> when running the program. Example: ruby -I . main.rb
-Idirectory specify $LOAD_PATH directory (may be used more than once)
So, I'm trying to build a quick console program for my development needs, akin to rails console (I'm using Sinatra + DataMapper + pry).
I run it and launch cat = Category.new(name: 'TestCat', type: :referential). It gives me the following error:
Error: Cannot open "/home/art-solopov/Projects/by-language/Ruby/billy-bones/=" for reading.
What could be the cause of the problem?
console:
#!/usr/bin/env ruby
$LOAD_PATH << 'lib'
require 'pry'
require 'config'
binding.pry
lib/config.rb:
# Configuration files and app-wide requires go here
require 'sinatra'
require 'data_mapper'
require 'model/bill'
require 'model/category'
configure :production do
DataMapper::Logger.new('db-log', :debug)
DataMapper.setup(:default,
'postgres://billy-bones:billy#localhost/billy-bones')
DataMapper.finalize
end
configure :development do
DataMapper::Logger.new($stderr, :debug)
DataMapper.setup(:default,
'postgres://billy-bones:billy#localhost/billy-bones-dev')
DataMapper.finalize
DataMapper.auto_upgrade!
end
configure :test do
require 'dm_migrations'
DataMapper::Logger.new($stderr, :debug)
DataMapper.setup(:default,
'postgres://billy-bones:billy#localhost/billy-bones-test')
DataMapper.finalize
DataMapper.auto_migrate!
end
lib/model/category.rb:
require 'data_mapper'
class Category
include DataMapper::Resource
property :id, Serial
property :name, String
property :type, Enum[:referential, :predefined, :computable]
has n, :bills
# has n, :tariffs TODO uncomment when tariff ready
def create_bill(params)
# A bill factory for current category type
case type
when :referential
ReferentialBill.new params
when :predefined
PredefinedBill.new params
when :computable
ComputableBill.new params
end
end
end
If I substitute pry with irb in the console script, it goes fine.
Thank you very much!
P. S.
Okay, yesterday I tried this script again, and it worked perfectly. I didn't change anything. I'm not sure whether I should remove the question now or not.
P. P. S.
Or actually not... Today I've encountered it again. Still completely oblivious to what could cause it.
** SOLVED **
DAMN YOU PRY!
Okay, so here's the difference.
When I tested it the second time, I actually entered a = Category.new(name: 'TestCat', type: :referential) and it worked. Looks like pry just thinks cat is a Unix command, not a valid variable name.
Not answer to the pry question I just generally hate case statements in ruby.
Why not change:
def create_bill(params)
# A bill factory for current category type
case type
when :referential
ReferentialBill.new params
when :predefined
PredefinedBill.new params
when :computable
ComputableBill.new params
end
end
to:
def create_bill(params)
# A bill factory for current category type
self.send("new_#{type}_bill",params)
end
def new_referential_bill(params)
ReferentialBill.new params
end
def new_predefined_bill(params)
PredefinedBill.new params
end
def new_computable_bill(params)
ComputableBill.new params
end
You could make this more dynamic but I think that would take away from readability in this case but if you'd like in rails this should do the trick
def create_bill(params)
if [:referential, :predefined, :computable].include?(type)
"#{type}_bill".classify.constantize.new(params)
else
#Some Kind of Handling for non Defined Bill Types
end
end
Or this will work inside or outside rails
def create_bill(params)
if [:referential, :predefined, :computable].include?(type)
Object.const_get("#{type.to_s.capitalize}Bill").new(params)
else
#Some Kind of Handling for non Defined Bill Types
end
end
I have three Ruby files in the same directory:
classthree.rb
otherclass.rb
samplecode.rb
Here are the contents of classthree.rb:
require './samplecode.rb'
require './otherclass.rb'
class ClassThree
def initialize()
puts "this class three here"
end
end
Here are the contents of samplecode.rb:
require './otherclass.rb'
require './classthree.rb'
class SampleCode
$smart = SampleCode.new
#sides = 3
##x = "333"
def ugly()
g = ClassThree.new
puts g
puts "monkey see"
end
def self.ugly()
s = SampleCode.new
s.ugly
puts s
puts $smart
puts "monkey see this self"
end
SampleCode.ugly
end
Here are the contents of otherclass.rb:
require './samplecode.rb'
require './classthree.rb'
END {
puts "ending"
}
BEGIN{
puts "beginning"
}
class OtherClass
def initialize()
s = SampleCode.new
s.ugly
end
end
My two questions are:
There has to be a better way than require './xyz.rb' for every class in the directory. Isn't there something like require './*.rb'?
When I run ruby otherclass.rb I get the following output:
Why do I get "beginning" and "ending" twice each??
At 1 - The best way to deal with it is to create another file. You can call it environment.rb or initialize.rb, and it would require all the needed files.
$LOAD_PATH.unshift File.dirname(__FILE__)
require 'samplecode.rb'
require 'classthree.rb'
require 'classthree.rb'
Now you only need to require this file once on the start of the application.
At 2 - You started from file 'otherclass.rb'. It displays the first 'beginning' bit and then it loads samplecode.rb file. At this point, 'otherclass.rb' has not been loaded yet - it was not required by any other file. hence samplecode.rb is rerunning whole otherclass.rb, which is being required there. Rerunning doesn't reload 'samplecode.rb' as it was already required (require checks first whether file was or was not required). That's why you're seeing those messages twice.
I created the following parser:
require "./artist"
require "./song"
require "./genre"
require "debugger"
class Parser
attr_accessor :artists, :genres, :song
attr_reader :mp3
REGEX = /(?<artist>.*)\s\-\s(?<song>.*)\s\[(?<genre>.*)\]/
def initialize(directory="data")
debugger
#mp3 = Dir.entries(directory).select {|f| !File.directory? f}
debugger
end
def parse
#mp3.map do |file|
match = REGEX.match(file)
artist = Artist.find_by_name(match[:artist]) || Artist.new.tap {|artist| artist.name = match[:artist]}
song = Song.new
song.name = match[:song]
song.genre = Genre.find_by_name(match[:genre]) || Genre.new.tap {|genre| genre.name = match[:genre]}
#debugger
artist.add_song(song)
end
end
end
a = Parser.new.parse
I tried running it by calling parser.rb in the directory, lib, where it is located. I get the following error messages:
Parser.rb:47:in `open': No such file or directory - data (Errno::ENOENT)
from parser.rb:47:in `entries'
from parser.rb:47:in `initialize'
from parser.rb:68:in `new'
from parser.rb:68:in `<main>'
This is my file structure:
Can anyone please tell me why it cannot recognize my data directory? I have been staring for a while now and cannot figure it out. It was working like 10 mins ago and I cannot remember what I change to get it all messed up.
Appreciate your feedback! Thanks
You should be able to run your example like ruby -I/lib lib/parser.rb from the directory above lib. The -I will set the "include path", such that the ruby interpreter will find the other required ruby files like (lib/)song.rb.
Let me preface by stating I'm a "new" programmer - an IT guy trying his hand at his first "real" problem after working through various tutorials.
So - here is what I'm trying to do. I'm watching a directory for a .csv file - it will be in this format: 999999_888_filename.csv
I want to return each part of the "_" filename as a variable to pass on to another program/script for some other task. I have come up w/ the following code:
require 'rubygems'
require 'fssm'
class Watcher
def start
monitor = FSSM::Monitor.new(:directories => true)
monitor.path('/data/testing/uploads') do |path|
path.update do |base, relative, ftype|
output(relative)
end
path.create do |base, relative, ftype|
output(relative)
end
path.delete { |base, relative, ftype| puts "DELETED #{relative} (#{ftype})" }
end
monitor.run
end
def output(relative)
puts "#{relative} added"
values = relative.split('_',)
sitenum = values[0]
numrecs = values[1]
filename = values[2]
puts sitenum
end
end
My first "puts" gives me the full filename (it's just there to show me the script is working), and the second puts returns the 'sitenum'. I want to be able to access this "outside" of this output method. I have this file (named watcher.rb) in a libs/ folder and I have a second file in the project root called 'monitor.rb' which contains simply:
require './lib/watcher'
watcher = Watcher.new
watcher.start
And I can't figure out how to access my 'sitenum', 'numrecs' and 'filename' from this file. I'm not sure if it needs to be a variable, instance variable or what. I've played around w/ attr_accessible and other things, and nothing works. I decided to ask here since I've been spinning my wheels for a couple of things, and I'm starting to confuse myself by searching on my own.
Thanks in advance for any help or advice you may have.
At the top of the Watcher class, you're going to want to define three attr_accessor declarations, which give the behavior you want. (attr_reader if you're only reading, attr_writer if you're only writing, attr_accessor if both.)
class Watcher
attr_accessor :sitenum, :numrecs, :filename
...
# later on, use # for class variables
...
#sitenum = 5
...
end
Now you should have no problem with watcher.sitenum etc. Here's an example.
EDIT: Some typos.
In addition to Jordan Scales' answer, these variable should initialized
class Watcher
attr_accessor :sitenum, :numrecs, :filename
def initialize
#sitenum = 'default value'
#numrecs = 'default value'
#filename = 'default value'
end
...
end
Otherwise you'll get uninformative value nil