Hello,

I need to preload an association on a get_by function, everything seems good but in the response it tell me there is no association

Here’s the concerned code :

Schema of the association :

  schema "users_cryptos" do
    belongs_to :user, Accounts.User
    belongs_to :crypto, Currencies.Crypto

    timestamps()
  end

  @doc false
  def changeset(user_crypto, attrs) do
    user_crypto
    |> cast(attrs, [:user_id, :crypto_id])
    |> validate_required([:user_id, :crypto_id])
    |> unique_constraint(:unique_subs, name: :subs_index)
  end

Controller calling the function :

  def index_by_user(conn, %{"user_id" => user_id}) do
    preloads = [:cryptos, :users]
    user_cryptos = Accounts.get_user_crypto_from_user!(user_id, preloads)
    render(conn, "index.json", users_cryptos: user_cryptos)
  end

Function in the context :

  def get_user_crypto_from_user!(user_id, preloads) do
    from(uc in UserCrypto, where: uc.user_id == ^user_id)
    |> Repo.all
    |> Repo.preload(preloads)
  end

If anyone sees the problem please take meout of Elixir preloads :')