訂購相關的軌道

下面是我在搜索頁面過濾項目辦：按相關訂購相關的軌道

@experiences = Mission.where(active: true) 
@experiences = @experiences.where(accept_families: true) if filter_params['forFamily'].present? && filter_params['forFamily'] == true 
@experiences = @experiences.includes(:country_missions).where(:country_missions => { :country_id => filter_params['countries'] }) if filter_params['countries'].present? 
@experiences = @experiences.includes(:skill_all).where(:skill_missions => { :skill_id => filter_params['skills'] }) if filter_params['skills'].present? 

months = [] 
months.push(12, 1, 2) if filter_params['start_winter'].present? && filter_params['start_winter'] == true 
@experiences = @experiences.joins(:start_dates).includes(:start_dates).where('extract(month from start_dates.start) IN (?)', months) unless months.blank?

我想不過濾這些項目，而是，排序，某種度量的得分;與選定的標籤，字符串等更巧合 - 分數越高，任務顯示得越高。

我想成爲這樣的查詢：

SELECT title, company, user, CASE 
    WHEN upper(company_name) LIKE '%#{word[0].upcase}%' THEN 3 
    WHEN upper(company_name) LIKE '%#{company_name.upcase}%' THEN 2 
    ELSE 0 END as score  
    FROM selected_tables 
    WHERE company_name LIKE '%#{company_name}%' 
    ORDER BY score DESC;

但是，這有點太簡單了;我無法想象如何爲每個標籤獲取「while」情況：例如，每個filter_params ['countries']都包含一個ID數組：[212,30,1]。對於每個國家而言，這就像存在於模型項目中一樣，得分會加1.

我該如何做？

我正在使用Postgres for database。

我已經嘗試過類似

SELECT *, 
    CASE 
     WHEN true THEN 0 
    END as score, 
    CASE 
     WHEN "skill_missions"."skill_id" IN (1) THEN score = score + 1 
    END, 
    CASE 
     WHEN "skill_missions"."skill_id" IN (2) THEN score = score + 1 
    END 


    FROM missions 
    LEFT OUTER JOIN "skill_missions" ON "skill_missions"."mission_id" = "missions"."id"

但是，這是不正確的。

來源

2017-02-21 Andrey Rodin

如果我理解正確你尋找的是這樣的：

SELECT title, company, user, 
     CASE WHEN upper(company_name) LIKE '%#{word[0].upcase}%' THEN 3 ELSE 0 END 
    + CASE WHEN upper(company_name) LIKE '%#{company_name.upcase}%' THEN 2 ELSE 0 END 
     as score  
    FROM selected_tables 
WHERE company_name LIKE '%#{company_name}%' 
ORDER BY score DESC;

來源

2017-02-21 10:18:18

訂購相關的軌道

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