Ruby每個未定義的方法

Question

我是紅寶石語言的新手，我現在嘗試學習它。 我有一個使用find_applicants方法的班級Company

class Company
attr_accessor :jobs
## TODO: This method should update the `jobs` property to an array of instances of
## class `Job`
def initialize(jobs)
  # Load the json file and loop over the jobs to create an array of instance of `Job`
  # Assign the `jobs` instance variable.
@jobs = jobs
end

## TODO: Impelement this method to return applicants from all jobs with a
## tag matching this keyword
def find_applicants(keyword)
# Use the `jobs` instance variable.
applicants = []
 @jobs.each do |job|
  job.applicants.each do |applicant|
    applicant.tags.each do |tag|
      if keyword.eql? tag
         # ...
      end
    end
  end
end 

end

和main.rb

require './src/company.rb'
require './src/applicant.rb'
require './src/job.rb'
require 'json'



company = Company.new('data/boundless.json')

applicants = company.find_applicants('google')
puts applicants

當編譯這個我有這個錯誤

/users/user/Desktop/BoundlessCaseStudy/src/company.rb:34：在find_applicants': undefined method main.rb：11：in中的nil：NilClass（NoMethodError）的每個find_applicants': undefined method

請幫忙

Answer 1

看起來您正在傳遞作業所在的json文件的名稱，而不是作業數組

company = Company.new('data/boundless.json')

但是您沒有編寫可解析該文件的que代碼，因為注釋正確地表明您應該

# Load the json file and loop over the jobs to create an array of instance of `Job`, 

因此，變量@jobs正在接收字符串，您將收到此錯誤：

NoMethodError: undefined method `each' for "data/boundless.json":String

編寫代碼以解析文件並正確設置@jobs變量