How to search through nested has_many through? - ruby-on-rails

Question

Here what I have now :
class Pokemon < ActiveRecord::Base
has_many :pokemon_moves, dependent: :destroy
has_many :moves, through: :pokemon_moves
end
class PokemonMove < ActiveRecord::Base
belongs_to :pokemon
belongs_to :move
end
class Move < ActiveRecord::Base
belongs_to :type
end
And many others, no important.
I just would like to search for a Pokémon which could have Move named "pound" and another Move "mega-punch"
I tried :
Pokemon.joins(:moves).where(moves: {name: 'pound'}).where(moves: {name: 'mega-punch'})
But no result. The translated SQL is :
SELECT "pokemons".* FROM "pokemons" INNER JOIN "pokemon_moves" ON "pokemon_moves"."pokemon_id" = "pokemons"."id" INNER JOIN "moves" ON "moves"."id" = "pokemon_moves"."move_id" WHERE "moves"."name" = $1 AND "moves"."name" = $2 [["name", "pound"], ["name", "mega-punch"]]
If I only search for one move, it works just fine, but I can't get it with two moves.
I have tried many things, but all concludes to bad results.
Of course, I have a Pokémon that have those moves, if I do Pokemon.find_by_name('golurk').moves I can retrieve those two moves.
Thanks !
UPDATE 1 :
I made it work by simply using & operator :
Pokemon.joins(:moves).where(moves: {name: 'pound'}) & Pokemon.joins(:moves).where(moves: {name: 'mega-punch'})
But it's really not efficient, and I'm pretty sure we can find a better way.

Answer 1

The reason you get no results is because you are searching for moves with the name pound AND the name mega punch.
Change your code to:
Pokemon.joins(:moves).where(moves: {name: ['pound', 'mega-punch']})
Chaining where results in AND in your sql. If you want OR, either use an array like in the example above, or write your own sql.