Ecto assoc_constraint doesn't work

Question

I have a Review model, which schema has belongs_to User notation.

Each review should belongs to user, so user_id column is mandatory.

  def changeset(model, params \\ :empty) do
    model
      |> cast(params, @required_fields, @optional_fields)
      |> a lot of things like validate_length
      |> assoc_constraint(:user)
  end

And this is my migration:

defmodule MyReelty.Repo.Migrations.AddUserIdToReviews do
  use Ecto.Migration

  def change do
    alter table(:reviews) do
      add :user_id, references(:users, on_delete: :nothing)
    end
    create index(:reviews, [:user_id])
  end
end

Unfortunately, when I'm running

%Review{} |> Review.changeset(@valid_params) |> Repo.insert!

review is saved! I double checked there is no user_id or other user related information in details.

By the way, I checked another stuff like validate_number it works!

Why does assoc_constraint doesn't work in this case?

Answer 1

You have to add user_id to @required_fields, that's it