輪胎（彈性搜索）無比較

Question

對於輪胎（ElasticSearch包裝寶石），如何查詢和篩選具有某個屬性的nil/null值的索引記錄。舉例來說，如果我有這樣的關係

class Article < ActiveRecord::Base 
    belongs_to :topic 
end 

我的文章索引，但我希望避免與topic_id =零拉回記錄。我試過這個代碼打擊，但沒有奏效。

class Article 
    belongs_to :topic 

    def search(q) 
    tire.search do 
     ... 
     filter :missing, :field => :topic_id, { :existence => false, :null_value => false } 
     ... 
     ### filter :range, :topic_id => { :gt => 0 } # ==> I tried this as well but didn't work 
     ... 
    end 
    end 
end 

Answer 1

@articles = Article.where（ 'topic_id是不是？'，無）

Answer 2

我認爲你應該使用exists filter如果你想只過濾與現有topic_id價值的文件。

class Article 
    belongs_to :topic 

    def search(q) 
    tire.search do 
     ... 
     filter :exists, :field => :topic_id 
     ... 
    end 
    end 
end 

或者你可以使用query string與_exists_:topic_id查詢。

Answer 3

請嘗試：

class Article 
    belongs_to :topic 

    def search(q) 
    tire.search do 
     ... 
     filter :not, :missing => {:field => :topic_id, { :null_value => true } } 
     ... 
    end 
    end 
end 

這應該工作。如果你想檢查該字段是否存在，則需要存在。我想你只需要null_value檢查。