如何用rails命令寫我的sql查詢

Question

我的sql命令是這樣的。我試圖與兩張桌子關係。我需要用rails helpers寫查詢來ruby命令。

select *, 
    (select branch_id 
    from branches_course_contents 
    where course_content_id=course_contents.id and branch_id=2) as Sube 
from course_contents 
where 
    (select branch_id 
    from branches_course_contents 
    where course_content_id=course_contents.id and branch_id=2)=2 
    or show_all_branches=true) 
    and content_type=0 

我的DB計劃：

branches 
----------------------------------- 
id 
name:string 
active:boolean 
.. 

course_contents 
----------------------------------- 
id 
title:string 
show_all_branches:boolean 
active:boolean 
.. 

branches_course_contents 
----------------------------- 
branch_id 
course_content_id 

和型號的文件：

class Branch < ApplicationRecord 
    has_and_belongs_to_many :course_contents 
    scope :active, -> { where(active: true) } 
end 

class CourseContent < ApplicationRecord 
    has_and_belongs_to_many :branches 
    scope :active, -> { where(active: true) } 
    scope :show_all_branches, -> { where(show_all_branches: true) } 
end 

我試着這樣CourseContent.show_all_branches.merge(-> { joins(:branches) })但它返回選定show_all_branches，並與分公司的關係。我其實需要選擇show_all_branches或與分支有關係。

Answer 1

你可以這樣做：

sql = "Select * from ... your sql query here" 
records_array = ActiveRecord::Base.connection.execute(sql)