I'm trying to run this code"
FACTORY = %w(ProcessedTransaction Chargeback).freeze
FACTORY.constantize.each do |factory|
factory.public_send(:delete_all)
end
end
But I get this error: NoMethodError: undefined methodconstantize' for #`
Do you know how I can solve the issue?
In ruby uppercased variables are constants by default so you can't call constantize on it. In your case it's just an array so this should work:
FACTORY = %w(ProcessedTransaction Chargeback).freeze
FACTORY.each do |factory|
factory.constantize.public_send(:delete_all)
end
You can call String#constantize only on strings but you are calling it on array FACTORY.
Remove FACTORY.constantize and add factory.constantize.public_send(:delete_all)
Also make sure you have ActiveSupport::Inflector required
Related
i am a newbie in ruby... I'm trying to convert media into a scorm package using what i found on github but i got an error while trying to run the script in the command prompt undefined method `gsub' for nil:NilClass. I guess it may be due to a defined method. any idea on how i can remove this error ?
dir = ARGV.shift.gsub(/\/+$/, '')
index = nil
media = []
Dir["#{dir}/media/*.json"].each do |file|
id = JSON.parse(File.read(file))
base = file.gsub(/\/media\/.*\.json$/, '')
index = "#{base}/index.html"
name = File.basename file
media.push [name,id]
puts "#{name}: #{id}"
end
As the error says, you are calling the method gsub on an object that is an instance of NilClass, in other words you are calling gsub on nil.
The error message tells you in which method and on which line this happens and how you got to that line of code. You will have to examine the error message to find the place in your code where you are calling gsub on an object that is nil, then you have to examine your code to find out why that object is nil instead of a String as you expect it to.
I did the 'requir_relative' but still got the NoMethodError.
There are 2 ruby files, under 'run.rb' I have this
class Run
def separate(data)
hash_block = []
(0...data.count).each do |i|
f = data[i].split('|')
hash_block[i] = Hashing.new(f[0].to_i, f[1], f[2], f[3], f[4])
end
hash_block
end
end
and then in the main file, I did these:
require_relative 'run'
...some codes...
to_separate = IO.readlines(ARGV[0])
separated = separate(to_separate)
...some codes...
but I still get this:
in `block in <main>': undefined method `separate' for main:Object (NoMethodError)
If I cut the method and paste it in the main file it will work as expected but that is something I wanted to avoid.
In order to call the method within the class Run you have to instantiate it. Since is an instance method. The way your calling the class is giving you the error undefined because it can not find it with in the scope of your current file
run_instance = Run.new
to_separate = IO.readlines(ARGV[0])
sperated = run_instance.separate(to_separate)
You required the file, but in that file you have a class definition. separate is inside that class (and that's an instance method), so you need an object to call the method on.
separated = Run.new.separate(to_separate)
I've used a gem and tried to create a method (trans) in my code.
require 'yandex-translator'
translator = Yandex::Translator.new(api_key)
def trans(text)
a = translator.translate text, to: "ru"
return a
end
puts trans("stack")
When I run the code, I get this error:
'trans': undefined local variable or method `translator' for main:Object (NameError)
Why did I get this error, and how can I solve this?
translator variable in this code is defined on class level, hence it’s a local variable in main context (since the whole code is executed in main context.)
You are trying to call it from the instance context, where it is obviously not defined. The easiest way to overcome it, would be to define #translator as being a class’ instance variable:
#translator = Yandex::Translator.new(api_key)
def trans(text)
#translator.translate text, to: "ru"
end
Because in this way you are looking for a local variable translator and you have not. Some solutions:
make translator global
$translator = Yandex::Translator.new(api_key)
or pass translator to trans method
def trans(translator, text)
translator.translate text, to: "ru"
end
I'm trying to get all of my prices in my array of URLS, getting the values with a CSS selector.
The thing is, the method at_css is giving me the following error:
undefined method `at_css' for string (NoMethodError)
Can anyone help me? Thanks
test = ["www.myweb.com/1", "www.myweb.com/2"]
test.each do |item|
Nokogiri::HTML(open(item))
puts item.at_css('.itemprice').text
puts item.at_css('.description').text
puts "Empty Line"
end
The item variable in your block is a string i.e. an element from your test array variable. And strings don't have a to_css method in Ruby. You probably wanted to call the to_css on some Nokogiri-related object.
I think you need the following:
some_var = Nokogiri::HTML(open(item))
some_var.at_css('.itemprice').text
I am trying to write an application with Ruby and Qt. I have the following code:
list = Qt::ListView.new(window)
mod1 = MyModel.new #MyModel inherits from Qt::AbstractListModel
list.model = mod1 #<< Fails on this line
But it fails, telling me:
undefined method `model=' for #<Qt::ListView:0x0000000067e300>
Yet I see other posts on SO that use model=, and I see the method listed in IRB when I issue list.public_methods.
OK, the problem is that I wasn't calling super() in the initialize method of my model.