如何在Rails中使用elasticsearch来搜索category.name？

Question

My search working fine. But I have to type "1" or "2" to get results of "roommate" or "sublet". Model has a column called category_id which is an integer. Model Category has column :name which is a string.

Thus, I have category_id 1 is having "roommate" and 2 is "sublet"

below is my Housing model:

class Housing < ActiveRecord::Base
    extend FriendlyId
    friendly_id :title, use: :slugged
    include Elasticsearch::Model
    include Elasticsearch::Model::Callbacks

    belongs_to :user
    belongs_to :category

    validates :title, :presence => true
    validates :category_id, :presence => true
    validates :created_at, :presence => false
    validates :user_email, :presence => true
    validates :description, :presence => false
    validates_length_of :title, :maximum => 30

    def self.search(query)
      __elasticsearch__.search(
        {
          query: {
            # multi_match: {
            simple_query_string: {
              query: query,
              fields: ['title^10', 'category_id']
            }
          }
        }
      )
    end

end

How can I fix fields: ['title^10', 'category_id'] So user can search "roommate" instead of must search integer "1" to get result of roommate ?

I tried fields: ['title^10', 'category.name'] but not working.

Answer 1

fields: ['title^10', 'category.name'] won't work unless you have correct mapping defined. Elasticsearch doesn't know about your associations. ES is a document store and searches for records using it's own document store. So unless you add your category name to the document stored in ES, you won't be able to search it.

TL;DR

Define a mapping. Example:

mapping dynamic: 'strict' do
    indexes :category do
      indexes :name
    end
    indexes :title
end

Here category will now be stored as nested object inside your index and hence is searchable using category.name