TypeError:无法将Array转换为字符串

Question

我在尝试使用Nokogiri运行rake任务时遇到此错误.

这是代码.

namespace :tops do
  desc "Get Tops Description"
  task get_description: :environment do
  require 'nokogiri'
  require 'open-uri'

 doc = Nokogiri::HTML(open("http://ceratoboutique.com/collections/tops"))

  price = Array.new 
  items = Array.new
  brands = Array.new
  sale_price = Array.new
  image = Array.new
  item_url = Array.new

  price = doc.xpath("//del").collect {|node| node.text.strip}
  items = doc.xpath("//div/a/h4").collect {|node| node.text.strip}
  brands = doc.xpath("//span[contains(@class,'vendor')]").collect {|node| node.text.strip}
  sale_price = doc.xpath("//span[contains(@class, 'price')]/text()").collect {|node| node.text.strip}
  image = doc.xpath("/div/a/img/@src").collect {|node| node.text.strip}
  item_url = doc.css('div.details a').map { |link| link['href'] }.collect 

  price.each do |prices|
      Tops.create(description: price)
    end
  end
end

这是完整的错误.

耙子流产!TypeError:无法将数组转换为字符串/Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/quoting.rb:76:in type_cast' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/sqlite3_adapter.rb:261:intype_cast'/ Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/sqlite3_adapter.rb:295:in block in exec_query' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/sqlite3_adapter.rb:294:inmap' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/ active_record/connection_adapters/sqlite3_adapter.rb:294:在exec_query' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/database_statements.rb:68:in exec_insert'/ Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/database_statements.rb :95 :in insert' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in insert'/ Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/relation.rb:64:in insert' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/persistence.rb:502:in _create_record'/ Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/ lib/active_record/attribute_methods/dirty.rb:87:_create_record' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/callbacks.rb:306:in 在_create_record'/ run_callbacks' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/callbacks.rb:306:in Library /Ruby/Gems/2.0.0/gems/activesupport-4.1.5/lib/active_support/callbacks.rb:82: in _create_record'/ 中的 块中 Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/timestamp.rb:57:in _create_record' /Library/Ruby/Gems/2.0.0/gems/activerecord-4.1.5/lib/active_record/persistence.rb:482:in create_or_update'/ Library/Ruby/Gems/2.0.0/ge 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编辑:TOPS TABLE SCHEMA

    ActiveRecord::Schema.define(version: 20140824150641) do

      create_table "tops", force: true do |t|
        t.string   "brand"
        t.string   "description"
        t.string   "image"
        t.decimal  "price"
        t.datetime "created_at"
        t.datetime "updated_at"
        t.string   "url"
      end
end

Answer 1

似乎你description在表中tops有'varchar' 字段,或者string你试图在其中存储数组.

在尝试存储之前,您需要将description字段的数据类型更改为text然后更改serialize值.

生成新的迁移文件并运行它,在您的终端上:

rails g migration change_desc_in_my_tops

在使用Rails 4时,在迁移文件中添加以下代码:

class ChangeDescInTops < ActiveRecord::Migration
  def up
    change_column :tops, :description, :text
  end

  def down
    change_column :tops, :description, :string
  end
end

现在运行迁移:

rake db:migrate

将您的tops模型更新为:

class Tops < ActiveModel::Base
  serialize :description, Array
  ...
  ...
end

现在尝试运行你的rake任务.希望,它会帮助你.

注意:您应该使用单一的模型名称.你的Tops模型可能是Top.它避免了使用关联时的混淆,它遵循惯例.