accessible_by Produces Incorrect Query For Self Referential Models about cancancan HOT 6 CLOSED

> Employee.accessible_by(Ability.new(user)).to_sql
 => "SELECT `employees`.`id` AS t0_r0, `employees`.`company_id` AS t0_r1, 
`employees`.`permissions` AS t0_r2, `employees`.`user_id` AS t0_r3, `employees`.`name` AS t0_r4, 
`companies`.`id` AS t1_r0, `companies`.`user_id` AS t1_r1, `companies`.`name` AS t1_r2, 
`employees_companies`.`id` AS t2_r0, `employees_companies`.`company_id` AS t2_r1, 
`employees_companies`.`permissions` AS t2_r2, `employees_companies`.`user_id` AS t2_r3, 
`employees_companies`.`name` AS t2_r4 FROM `employees` LEFT OUTER JOIN `companies` ON 
`companies`.`id` = `employees`.`company_id` LEFT OUTER JOIN `employees` 
`employees_companies` ON `employees_companies`.`company_id` = `companies`.`id` WHERE 
`employees`.`user_id` = 1" 

> Customer.accessible_by(Ability.new(user)).to_sql
 => "SELECT `customers`.`id` AS t0_r0, `customers`.`company_id` AS t0_r1, `customers`.`user_id` AS 
t0_r2, `customers`.`name` AS t0_r3, `companies`.`id` AS t1_r0, `companies`.`user_id` AS t1_r1, 
`companies`.`name` AS t1_r2, `employees`.`id` AS t2_r0, `employees`.`company_id` AS t2_r1, 
`employees`.`permissions` AS t2_r2, `employees`.`user_id` AS t2_r3, `employees`.`name` AS t2_r4 
FROM `customers` LEFT OUTER JOIN `companies` ON `companies`.`id` = `customers`.`company_id` 
LEFT OUTER JOIN `employees` ON `employees`.`company_id` = `companies`.`id` WHERE 
`employees`.`user_id` = 1"