Queries on arrays and hashes

We can easily search in arrays and hashes as we did with fields. For example, if a Book class has awards, we can search in the awards field. Let's see some code regarding the same:

irb> b = Book.first
 => #<Book _id: 516e7ab045db7cd86a000001, t(title): "Aristortle",
... published_date: nil, is_best_seller: false, awards: [], currency: nil>
 
irb> b.awards
 => [] 

irb> b.awards << 'first place'
 => ["first place"] 

irb> b.awards << 'second place'
 => ["first place", "second place"] 

irb> b.awards << 'third place'
 => ["first place", "second place", "third place"] 

irb> b.save
 => true

Now, we can search in the awards fields in the usual way as follows:

irb> Book.in(awards: ['second place']).first

=> #<Book _id: 516e7ab045db7cd86a000001, t(title): "Aristortle", published_date: nil, is_best_seller: false, awards: ["first place", "second place", "third place"], currency: nil>

However, searching...