從Ruby使用Solr

從Ruby使用Solr

Solr有一個可選的Ruby響應格式，它擴展了JSON輸出以允許Ruby的解釋器安全地評估響應。

這種Ruby響應格式與JSON的不同之處在于：

• Ruby的單引號字符串用于防止可能的字符串利用：
  • \ 和 ' 是僅有的兩個轉義字符；
  • unicode轉義不使用,數(shù)據(jù)被寫為原始的UTF-8
• nil 用于 null
• => 用作映射中的鍵/值（key/value）分隔符

下面是一個來自Solr的Ruby響應示例，其中包含一個請求：http://localhost:8983/solr/techproducts/select?q=iPod&wt=ruby&indent=on（使用Solr啟動bin/solr start -e techproducts）：

{
  'responseHeader'=>{
    'status'=>0,
    'QTime'=>0,
    'params'=>{
      'q'=>'iPod',
      'indent'=>'on',
      'wt'=>'ruby'}},
  'response'=>{'numFound'=>3,'start'=>0,'docs'=>[
      {
        'id'=>'IW-02',
        'name'=>'iPod & iPod Mini USB 2.0 Cable',
        'manu'=>'Belkin',
        'manu_id_s'=>'belkin',
        'cat'=>['electronics',
          'connector'],
        'features'=>['car power adapter for iPod, white'],
        'weight'=>2.0,
        'price'=>11.5,
        'price_c'=>'11.50,USD',
        'popularity'=>1,
        'inStock'=>false,
        'store'=>'37.7752,-122.4232',
        'manufacturedate_dt'=>'2006-02-14T23:55:59Z',
        '_version_'=>1491038048794705920},
      {
        'id'=>'F8V7067-APL-KIT',
        'name'=>'Belkin Mobile Power Cord for iPod w/ Dock',
        'manu'=>'Belkin',
        'manu_id_s'=>'belkin',
        'cat'=>['electronics',
          'connector'],
        'features'=>['car power adapter, white'],
        'weight'=>4.0,
        'price'=>19.95,
        'price_c'=>'19.95,USD',
        'popularity'=>1,
        'inStock'=>false,
        'store'=>'45.18014,-93.87741',
        'manufacturedate_dt'=>'2005-08-01T16:30:25Z',
        '_version_'=>1491038048792608768},
      {
        'id'=>'MA147LL/A',
        'name'=>'Apple 60 GB iPod with Video Playback Black',
        'manu'=>'Apple Computer Inc.',
        'manu_id_s'=>'apple',
        'cat'=>['electronics',
          'music'],
        'features'=>['iTunes, Podcasts, Audiobooks',
          'Stores up to 15,000 songs, 25,000 photos, or 150 hours of video',
          '2.5-inch, 320x240 color TFT LCD display with LED backlight',
          'Up to 20 hours of battery life',
          'Plays AAC, MP3, WAV, AIFF, Audible, Apple Lossless, H.264 video',
          'Notes, Calendar, Phone book, Hold button, Date display, Photo wallet, Built-in games, JPEG photo playback, Upgradeable firmware, USB 2.0 compatibility, Playback speed control, Rechargeable capability, Battery level indication'],
        'includes'=>'earbud headphones, USB cable',
        'weight'=>5.5,
        'price'=>399.0,
        'price_c'=>'399.00,USD',
        'popularity'=>10,
        'inStock'=>true,
        'store'=>'37.7752,-100.0232',
        'manufacturedate_dt'=>'2005-10-12T08:00:00Z',
        '_version_'=>1491038048799948800}]
  }}

下面是一個簡單的例子，說明如何使用Ruby響應格式來查詢Solr：

require 'net/http'

h = Net::HTTP.new('localhost', 8983)
http_response = h.get('/solr/techproducts/select?q=iPod&wt=ruby')
rsp = eval(http_response.body)

puts 'number of matches = ' + rsp['response']['numFound'].to_s
#print out the name field for each returned document
rsp['response']['docs'].each { |doc| puts 'name field = ' + doc['name'] }

對于與Solr的簡單交互，這可能是所有你需要的！如果您正在使用Solr建立復雜的交互，請參考：https://wiki.apache.org/solr/Ruby%20Response%20Format