嵌套关联 - elasticsearch-rails还是耐嚼？

Question

我有一个带有ActiveRecord模型的Rails应用程序,它们之间有关联.

为了简单起见,假设我的数据库架构完全相同 - https://github.com/elastic/elasticsearch-rails/blob/master/elasticsearch-model/examples/activerecord_associations.rb#L95

我想搜索名为"John"的文章作者.

Article.search('john')按预期在article.authors的指定字段first_name和last_name中搜索.

我想更具体一点,只能通过first_name通过article.authors搜索文章.

Article.search(authors: {first_name: 'john'}) 不起作用.

做上述事情的正确方法是什么？

同样使用Elastic HQ,在文章索引中有字段作者.这是否意味着elasticsearch-rails索引是正确的并且嵌套作者？

Answer 1

我假设你有可访问和工作的ElasticSearch实例.如果要使用嵌套实体的查询,则必须使用chewygem 提供的接口,即定义自定义索引字段.这是vanilla文档的示例.首先,你需要创建/app/chewy/article_index.rb

class ArticleIndex < Chewy::Index
  define_type Article.published.includes(:author_name) do
    # `published` above is example scope of published-only articles
    # I guess you may have :title and :body fields in model
    field :title, :body
    # Here is custom index field with *full* author name.
    # We use lambda to extract it from article:
    field :author_name, value: ->(article) { "#{article.author.first_name} #{article.author.last_name}" }
  end
end

现在查询为:

UsersIndex.query(text: {author_name: 'John'})
# or
UsersIndex.query(text: {author_name: 'Smith'})
# or even ...
UsersIndex.query(text: {author_name: 'John Smith'}) 

更多阅读材料:

• chewy 宝石文档
• 惊人的Toptal 文章

干杯!