Wrong number of arguments (0 for 1) Ruby

Question

def self.grab article = self.article_names links = self.article_links body = self.article_body articles = {} articles[:title] = article articles[:url] = links articles[:body] = body art = Ello::Hello.new art(articles) end

When I run this with

class Ello::Hello attr_accessor :url, :article, :body, @@all = [] def initialize(hash) @article = hash["title"] @body = hash["body"] @url = hash["url"] @@all << self end def self.all @@all end end

I get wrong number of arguments error? I know that usually when it says wrong number it means that it's not exactly reading the argument that I put in. But I feel like I did put in an argument but I'm unsure of why it's not being read.

Use Ello::Hello.new(articles) instead, the parameters must be passed right when you initialize a new object. — Sebastián Palma
– Sebastián Palma, Commented Aug 31, 2020 at 5:34
Seeing a class variable here is usually a sign things have gone awry. Consider using a different approach, like where self.all is defined as @all ||= [ ] and then you can do self.class.all << self in the instance if you need this. Remember retaining every object can prevent the garbage collector from doing its job. — tadman
– tadman, Commented Sep 1, 2020 at 0:05

user1934428 · Accepted Answer · 2020-08-31 11:07:23Z

In such cases, you should always paste the complete error message, and indicate which line in your code is affected.

Anyway, I can see that your wrote art = Ello::Hello.new (0 arguments), but the initialize method for this class expects 1 argument.

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