Rails: ActiveRecord query based on association value

I have 2 models. Report and Server that have a belongs_to and has_many relationship. I created an accessor method using delegate that allows a Report to find its associated Server.company_id. Now, I want to run a query on Report that allows me to find all Report that are associated with a specific Server that has a specific company_id attribute of 5.

Here are my two models. And yes I know the current query wont work since Report does not have an attribute company_id.

And no, I dont want to store company_id inside of Report since that information doesn't belong in Report.

Report

class Report < ActiveRecord::Base
  
 belongs_to :server

 delegate :company_id, :to => :server

 	class << self

	  	def method(url, base_url)
			#Report.where(company_id: 5)
	  	end
	end

end

Server

class Server < ActiveRecord::Base

 attr_accessible :company_id
  
 has_many :reports

end

You can perform a query like this:

Report.joins(:servers).where(:servers => {:company_id => 5})

To me, this is the cleaner solution to raw SQL.

I'm using Rails 4.1.7 and the accepted answer did not work for me. What did work is

Report.joins(:server).where(:servers => {:company_id => 5})

Note that the difference is the key in the where clause is pluralized (:servers instead of :server)

This should do the trick

Report.joins(:server).where('servers.company_id = ?', 5)

you could also add a scope for this like so

scope :with_company_id, lambda {|id| joins(:server).where('servers.company_id = ?', id) }

and then write

Report.with_company_id(5)