更像这样的 elasticsearch-rails 和 mongoid 什么都不返回

Question

我使用 MongoDB 来存储有关鞋子的信息。每只鞋都有一个标题（字符串）、照片（字符串，这是照片的网址）、链接（字符串，原始网站的网址）、尺寸（字符串数组）、颜色（字符串数组）和价格（字符串) 和性别（字符串）。

在我的 project/app/models/shoe.rb 文件中，我有：

class Shoe
  include Mongoid::Document
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  field :title
  field :photo
  field :link
  field :price
  field :gender
  field :sizes, type: Array, default: []
  field :colors, type: Array, default: []

  def as_indexed_json
    as_json({only: [:title, :gender, :colors, :price, :sizes]})
  end

  settings index: { number_of_shards: 1 } do
    mappings dynamic: 'false' do
      indexes :title, analyzer: 'bulgarian'
      indexes :colors, analyzer: 'bulgarian'
      indexes :gender, analyzer: 'bulgarian'
    end
  end

  def self.more_like_this(shoe)
    __elasticsearch__.search(
      {
        query: {
          bool: {
              must: {match_all: { }},
              should: [
                # {
                #   more_like_this: {
                #     fields: ['title'],
                #     like: [
                #       {
                #         _index: 'shoes',
                #         _type: 'shoe',
                #         _id: shoe.id
                #       }
                #     ],
                #     boost: 2.0
                #   }
                # },
                {
                  more_like_this: {
                    fields: ['gender'],
                    like: [
                      {
                        _index: 'shoes',
                        _type: 'shoe',
                        _id: shoe.id
                      }
                    ],
                  }
                }
              ],
              minimum_should_match: 1
          }
        }
      }
    )
  end
end

# Delete the previous shoes index in Elasticsearch
Shoe.__elasticsearch__.client.indices.delete index: Shoe.index_name rescue nil

# Create the new index with the new mapping
Shoe.__elasticsearch__.client.indices.create \
  index: Shoe.index_name,
  body: { settings: Shoe.settings.to_hash, mappings: Shoe.mappings.to_hash }

# Index all shoe records from the DB to Elasticsearch
Shoe.import

在 project/config/initializers/elasticsearch.rb 我有：

config = {
  host: "http://localhost:9200/",
  transport_options: {
    request: { timeout: 5 }
  },
}

if File.exists?("config/elasticsearch.yml")
  config.merge!(YAML.load_file("config/elasticsearch.yml").symbolize_keys)
end

Elasticsearch::Model.client = Elasticsearch::Client.new(config)

unless Shoe.__elasticsearch__.index_exists?
  Shoe.__elasticsearch__.create_index! force: true
  Shoe.import
end

在 project/config/mongoid.yml 我有：

    development:
      # Configure available database clients. (required)
      clients:
        # Defines the default client. (required)
        default:
          # Defines the name of the default database that Mongoid can connect to.
          # (required).
          database: cornersport
          # Provides the hosts the default client can connect to. Must be an array
          # of host:port pairs. (required)
          hosts:
            - localhost:27017
    test:
      clients:
        default:
          database: calceus_test
          hosts:
            - localhost:27017
          options:
            read:
              mode: :primary
            max_pool_size: 1

现在，在运行 elasticsearch 的 Rails 控制台中，我调用了Shoe.more_like_this(some_shoe_object).results.to_a，它返回了[]。首先，我的查询包括注释部分，但是当我没有得到任何结果时，我将其注释掉，尽管数据库中有更多与some_shoe_object 相同性别的记录，但我仍然没有得到任何结果。它不应该返回一些东西吗？我使用弹性搜索错了吗？我是初学者。请帮忙！

Answer 1

看起来您的索引是通过初始化文件elasticsearch.rb 创建的，而您还没有指定设置。

尝试将初始化文件更改为

config = {
  host: "http://localhost:9200/",
  transport_options: {
    request: { timeout: 5 }
  },
}

if File.exists?("config/elasticsearch.yml")
  config.merge!(YAML.load_file("config/elasticsearch.yml").symbolize_keys)
end

Elasticsearch::Model.client = Elasticsearch::Client.new(config)

unless Shoe.__elasticsearch__.index_exists?
  Shoe.__elasticsearch__.client.indices.create index: Shoe.index_name,
   body: { settings: Shoe.settings.to_hash, mappings: Shoe.mappings.to_hash }
  Shoe.import
end

同样从您的shoe.rb 文件中，最后删除索引创建/删除部分

# Delete the previous shoes index in Elasticsearch
Shoe.__elasticsearch__.client.indices.delete index: Shoe.index_name rescue nil

# Create the new index with the new mapping
Shoe.__elasticsearch__.client.indices.create \
  index: Shoe.index_name,
  body: { settings: Shoe.settings.to_hash, mappings: Shoe.mappings.to_hash }

# Index all shoe records from the DB to Elasticsearch
Shoe.import

重启你的服务器，ES再试一次！

---

更新

尝试像这样更改您的 more_like_it 子句：

more_like_this: {
  fields: ['gender'],
    like: [
      {
        _index: 'cornersport',
        _type: 'shoes',
        _id: shoe.id
       },
       shoe.gender
     ]
}

Answer 2

我是这样编辑的：

def self.more_like_this(shoe)
  __elasticsearch__.search(
    {
      query: {
        bool: {
            must: {match_all: { }},
            should: [
              {
                more_like_this: {
                  fields: ['gender'],
                  docs: [
                    {
                      _index: 'shoes',
                      _type: 'shoe',
                      _id: shoe.id
                    }
                  ],
                  ids: [shoe.id]
                }
              }
            ],
            minimum_should_match: 1
        }
      }
    }
  )
end

现在效果很好。只需将like 替换为docs 并添加ids 就像这里解释的那样：https://www.elastic.co/guide/en/elasticsearch/reference/1.4/query-dsl-mlt-query.html 到目前为止，我一直在努力让它按照这里的解释工作： https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-mlt-query.html

我正在使用 elasticsearch-2.2.0，所以我不明白 2.2.0 的功能如何不适用于我，而是 1.4 的功能。也许 elasticsearch-rails 适用于 1.4。