Rails 机械化加入 Table 循环

Question

我有一个应用程序，其中包含列表、标签和 Listing_Tag 模型。我想创建标签并在机械化任务中分配它们。目前我正在创建列表，遍历标签并创建它们但是当我通过列表标签将标签分配给列表时我得到这个错误

rake aborted!
NoMethodError: undefined method `each' for 0:Integer
/Users/mycomp/RubymineProjects/OpportunityFinder/lib/tasks/brisbane.rake:181:in `block (2 levels) in <top (required)>'
/Users/mycomp/.rvm/gems/ruby-2.4.2/gems/nokogiri-1.8.4/lib/nokogiri/xml/node_set.rb:204:in `block in each'
/Users/mycomp/.rvm/gems/ruby-2.4.2/gems/nokogiri-1.8.4/lib/nokogiri/xml/node_set.rb:203:in `upto'
/Users/mycomp/.rvm/gems/ruby-2.4.2/gems/nokogiri-1.8.4/lib/nokogiri/xml/node_set.rb:203:in `each'
/Users/mycomp/RubymineProjects/OpportunityFinder/lib/tasks/brisbane.rake:170:in `block in <top (required)>'
/Users/mycomp/.rvm/gems/ruby-2.4.2@global/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
/Users/mycomp/.rvm/gems/ruby-2.4.2/bin/ruby_executable_hooks:15:in `eval'
/Users/mycomp/.rvm/gems/ruby-2.4.2/bin/ruby_executable_hooks:15:in `<main>'

第 170 行是 page.search 并且第 181 行是用于 t do

中的标记

class Listing < ApplicationRecord

  has_many :listing_tags
  has_many :tags, through: :listing_tags

class ListingTag < ApplicationRecord
  belongs_to :listing
  belongs_to :tag
end

class Tag < ApplicationRecord
  has_many :listings, through: :listing_tags
end

我在 Mechanize 中创建了一个清单和标签。

page.search('a[title="view business"]').each do |link|
    mechanize.click(link)
    l = Listing.find_or_create_by(name: mechanize.page.css('article h1[itemprop="name"]').text.strip)
    t = mechanize.page.css('body main div.row.flex-page div.column.medium-3.__left-col-small article ul:nth-child(14) li').each do |tag|
      Tag.find_or_create_by(name: tag.text.strip)
    end

然后我想通过 Listing_tag

关联列表和标签

for tag in t do
 ListingTag.find_or_create_by(listing_id: l.id, tag_id: tag.id)
end

我做错了什么？我的连接 table 是否设置正确（我认为这是因为它在表单中有效）

Answer 1

您似乎想要执行以下操作：

ListingTag.find_or_create_by(listing_id: listing.id, tag_id: tag.id)

Rails 机械化加入 Table 循环

Rails Mechanize Join Table Loop

ruby-on-rails

mechanize

jointable