Ruby每个未定义的方法

Question

我是红宝石语言的新手，我现在尝试学习它。 我有一个使用find_applicants方法的班级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

当编译这个我有这个错误

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

请帮忙

Answer 1

看起来您正在传递作业所在的json文件的名称，而不是作业数组

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

但是您没有编写可解析该文件的que代码，因为注释正确地表明您应该

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

因此，变量@jobs正在接收字符串，您将收到此错误：

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

编写代码以解析文件并正确设置@jobs变量