在Ruby on Rails 4中使用Active Record或Squeel Gem重新编写SQL查询

Question

I am having a lot of problems rewriting this SQL Query in Squeel or straight Active Record using Ruby on Rails 4.

All 3 numbers in the query need to be passed to the query before execution. The SQL Query is below.

SELECT "users".* 
FROM "users"  
WHERE "users"."id" 
IN (SELECT "users"."id" FROM "users"  
INNER JOIN marketing_assets ON users.id = marketing_assets.user_id 
WHERE  marketing_assets.marketing_platform_id= 3 
GROUP BY users.id HAVING COUNT(DISTINCT marketing_assets.marketing_platform_id) = 1)

You can find out more detail about how it is being used at Error when trying to chain class method in controller in Ruby on Rails

Answer 1

marketing_assets_id = 3
limit_marketing_assets = 1
User.joins(:marketing_assets).where(:marketing_assets => {:marketing_platform_id => marketing_assets_id}).group(:users => :id).having("COUNT(DISTINCT marketing_assets.marketing_platform_id) = #{limit_marketing_assets}")

Answer 2

Here is the query I ended up writing using Squeel. It works for me.

User.where{users.id.in(User.joins{marketing_assets}
.where((['marketing_assets.marketing_platform_id = ?' ] * platforms.count)
.join(' OR '), *platforms).group{users.id}
.having{{marketing_assets => 
{COUNT(DISTINCT(marketing_assets.marketing_platform_id)) => platforms.count }}})}