Schema.rb

Question

这样做是应用程序获得项目的Steam市场价格。我不小心删除了database.db，从那时起，同样的错误一直在弹出。我想知道代码有什么问题。也许我忽略了代码的某些部分。

问题出现在index.erb文件中。

App.rb

require 'bundler/setup'
Bundler.require
require 'sinatra/reloader' if development?
require 'open-uri'
require "sinatra/json"
require 'uri'
require 'json'
require './models/bookmark.rb'
#require './models.rb'

enable :sessions

post '/signup' do
 @user = User.create(mail:params[:mail], password:params[:password],
 password_confirmation:params[:password_confirmation])

 if @user != nil
 session[:user]=@user.id
 end
 redirect '/'
end

post '/signin' do
 user = User.find_by_mail(params[:mail])
 if user && user.authenticate(params[:password])
 session[:user] = user.id
 end
 redirect '/'
end

get '/signout' do
 session[:user] = nil
redirect '/'
end




get '/' do
  userid = session[:user]

  if userid==nil
  redirect '/home'

  else

  @user = User.find_by_id(userid)
  @bookmark = @user.bookmarks
  end
  erb :inde1x
end
=begin
 userid = session[:user]

  if userid==nil
  redirect '/home'

  else

  @user = User.find_by_id(userid)
  @bookmarks = @user.bookmarks

  end
=end


get '/signin' do
 erb :signin
end
get '/signup' do
 erb :signup
end



#get '/' do
# @bookmarks = Bookmark.all

 #erb :index
#end
post '/create' do
 url1 = params[:url]
 url2 = URI.escape(url1)
 priceurl = Nokogiri::HTML.parse(open('http://steamcommunity.com/market/search?appid=730&q='+url2))
 erlength= priceurl.css('#searchResultsRows').text

 if erlength.length >150

 priceurl2= p priceurl.search("#resultlink_0")[0].attributes["href"].text

 texturl= priceurl2[46..-1]
 else

 redirect '/'
 end



 redirect '/api/site?url='+texturl

end


get '/api/site' do
 rawurl = params[:url]
 url1 = URI.escape(rawurl)
# url2 = URI.escape(url1)
 logger.info url
 price = open('http://steamcommunity.com/market/priceoverview/?currency=1&appid=730&market_hash_name='+url1).read
 data = JSON.load(price)
 pricecheck= data['median_price']
 #priceooo= pricecheck[1..6]



 imagerine = Nokogiri::HTML.parse(open('https://steamcommunity.com/market/listings/730/'+url1))

 imagebomb= imagerine.at_css('.market_listing_largeimage img')['src']

 images= '<img src="'+imagebomb+'"/>'

 html = Nokogiri::HTML.parse(open('https://steamcommunity.com/market/listings/730/'+url1))
 title = html.css('title').text
 titles = title.sub(/^Steam Community Market :: Listings for / , '')
 Bookmark.create(title: titles, url: " Average Price: "+ pricecheck, pricecheck: images, user_id: session[:user] )
 redirect '/'



end
post '/delete/:id' do
 Bookmark.find(params[:id]).destroy
 redirect '/'
end


post '/usercreateauth' do
  Bookmark.create(title: params[:password], url: params[:username])
  #redirect '/'+params[:username]

end


get '/home' do
 erb :home
end

index.erb

的一部分

这就是问题的根源所在。

出于某种原因，＆＃34;每个＆＃34;不再是一种方法。

<div class="main">

    <div id="app">  
    <h4>Input the item's name into the box</h4>
    <p>Ex: Awp Asiimov Well Worn,  </p>
    <div style="height:20vh; overflow:hidden;"><img style="width:20vw;" src="/name.png"/></div>
    <form action="/create" method="post" id="frm" class="">
 <!--label for="url">Hash Value</label>
 <input  name="url" id="url"-->
 <label for="url">Item Name</label>
 <input  name="url" id="url">
 <input type="submit" value="Submit" name="commit" class="btn btn-primary submit"></input>
 </form>
 <br>

 <div class="container-fluid">

 <div class="row">
 <% @bookmarks.each do |bookmark| %>
 <div class="containerbox">
<p><%= bookmark.pricecheck%></p>
 <p><%= bookmark.title %><b id="price"><%= bookmark.url %></b></p>

 <span>
 <form action="/delete/<%= bookmark.id %>" method="post">
 <input class="delete" type="submit" value="x">
 </form>
 </span>

 </div>
 <% end %>

Bookmark.rb

   ActiveRecord::Base.establish_connection(ENV['DATABASE_URL']||"sqlite3:db/development.db")
class Bookmark < ActiveRecord::Base
 belongs_to :user
end

unless ENV['RACK_ENV'] == 'production'
 ActiveRecord::Base.establish_connection("sqlite3:db/development.db")
end

class User < ActiveRecord::Base
 has_many :bookmarks
 has_secure_password
 validates :password,
 length: {in: 1..10}
end

Schema.rb

ActiveRecord::Base.establish_connection(ENV['DATABASE_URL']||"sqlite3:db/development.db")
class Bookmark < ActiveRecord::Base
 belongs_to :user
end

unless ENV['RACK_ENV'] == 'production'
 ActiveRecord::Base.establish_connection("sqlite3:db/development.db")
end

class User < ActiveRecord::Base
 has_many :bookmarks
 has_secure_password
 validates :password,
 length: {in: 1..10}
end

Answer 1

我在App.rb中注意到您有一行@bookmark = @user.bookmarks。请注意，@bookmark是单数。然后在视图模板中尝试运行@bookmarks.each（复数=一个完全不相关的实例变量名称）。如果代码无法识别名称@bookmarks，则该对象将默认为nil，但不理解方法.each。仔细检查你的变量名！这是一个常见的错误来源，这个特殊的错误（“Nil :: NilClass上的未知方法[某些方法名称”]）在Rails开发中非常常见。

更一般地说，App.rb文件的格式对我来说很奇怪。它看起来像是routes.rb（将每个URL路由连接到控制器操作）和控制器（它接受请求输入并准备视图正确呈现所需的所有变量）的角色。您的应用程序是否有这样的结构？如果没有，我强烈建议您熟悉Rails的路由和标准结构。控制器;这两个代码通常保存在不同的地方是有充分理由的。（除此之外，它可能会使这样的错误更容易排除故障！）

使用Ruby获取方法错误＆＃34; NoMethodError：未定义的方法`每个＆＃39;为零：NilClass＆＃34;

App.rb

index.erb

这就是问题的根源所在。

Bookmark.rb

Schema.rb

1 个答案: