Rails: Has many through associations — find with AND condition, not OR condition

Question

I have the following query method in my ActiveRecord model:

def self.tagged_with( string )
    array = string.split(\',\').map{ |s| s.lstrip }
    select(\'disti         


        

Answer 1

This should work:

def self.tagged_with( string )
  array = string.split(',').map{ |s| s.lstrip }
  select('distinct photos.*').
    joins(:tags).
    where('tags.name' => array).
    group("photos.id").
    having("count(*) = #{array.size}")
end

Above will match photos that have tags red and blue at least. So that means if a photo has red, blue and green tags, that photo would match too.