httparty NoMethodError: undefined method `[]' for nil:NilClass

Question

我使用 Ruby 2.5.0，httparty gem 我的模型

class FeedEntry
  include Mongoid::Document
  include Mongoid::Timestamps

  field :guid, type: String
  field :url, type: String
  field :share_count, type: Integer, default: 2

  before_update :share_info

  def share_info
    checked_url = self.url
    json_stats = HTTParty.get("http://api.sharedcount.com/?url=#{checked_url}&apikey=#{Rails.application.credentials.socialshared_api_key}", timeout: 180, open_timeout: 1200)
    self.share_count = json_stats['Facebook']['share_count']
  end
end

当我尝试解析时出现此错误

NoMethodError: undefined method `[]' for nil:NilClass

/Users/ipatov/rails_projects/apps/tm/app/models/feed_entry.rb:71:in `share_info'

71行 self.share_count = json_stats['Facebook']['share_count']

Answer 1

这是关于 Rollbar says

的最常见错误之一

问题肯定是 json_stats['Facebook'] 是 nil，因此访问 ['share_count'] 会产生错误。我建议您使用 dig 来防止这种意外错误，并决定当 json_stats['Facebook'] 为 nil 时要做什么。

    self.share_count = json_stats.dig('Facebook', 'share_count')

httparty NoMethodError: undefined method `[]' for nil:NilClass

httparty NoMethodError: undefined method `[]' for nil:NilClass

ruby-on-rails

httparty