Question

I have scraped data from a website and entered it into an array using the code below:

  def process_course_details(course_details)
        details_array =[]
        details_link = true 
        entry_link = true

                details_info = {}
                # Sets all data in hash
                details_info[:url] = clean_link(course_details.search('div.coursedetails_programmeurl a'))
                details_array.push(details_info)
                print_details_info(details_info)


             entry_link = course_details.search('ul.details_tabs').first

     end

The code above stores the element being pulled as such:

<a href="http://www.abdn.ac.uk/study/courses/undergraduate/C8R1/">View course details on provider's website</a>

But I'd like to clean the above to the below:

http://www.abdn.ac.uk/study/courses/undergraduate/C8R1/

or failing that remove the apostrophe and have this:

<a href="http://www.abdn.ac.uk/study/courses/undergraduate/C8R1/">View course details on providers website</a>`

Answer 1

你可以像这样用Nokogiri提取href：

html = Nokogiri::HTML('<a href="http://www.abdn.ac.uk/study/courses/undergraduate/C8R1/">View course details on provider\'s website</a>')
html.xpath("//a/@href").to_s # => "http://www.abdn.ac.uk/study/courses/undergraduate/C8R1/"

Answer 2

基于your comment：

当存储其他数据时，我已将数据删除到数据库中提供错误并停止它。一旦我清理了撇号和它不再是代码工作的数组的一部分而且是表创建
db = SQLite3::Database.open('ahhh.sqlite3')
db.execute "INSERT INTO aahah (uname, cname, duration, qualification, url, entry) VALUES ('#{@uni_name}', #{@course_name}', '#{@course_duration}', '#{@course_qual}', '#{@details_entry}', '#{@requirements}')"

您正在通过字符串插值插入值：

db.execute("INSERT INTO table_name (foo, bar) VALUES ('#{@foo}', '#{@bar}')")

显然，如果插值字符串包含撇号，则您的SQL字符串可能会变为无效。更糟糕的是，此代码很容易SQL injection。

相反，您应该使用参数标记并让SQLite gem处理转义：

db.execute("INSERT INTO table_name (foo, bar) VALUES (?, ?)", [@foo, @bar])

这允许您安全地插入撇号和其他特殊字符。

清理刮了<a href=""> rails

2 个答案: