Conditional Validation in Ecto for OR - 1 of 2 fields is required

Question

How can I do conditional validation for OR logic, where we check to see if 1 of the 2 values is present or both values are present.

So, for example, if I want to check t

Answer 1

You could also create the constraint in the database, e.g. by writing a migration:

create(
  constraint(
    :users,
    :email_or_mobile,
    check: "(email IS NOT NULL) OR (mobile IS NOT NULL)"
  )
)

And use check_constraint to validate the changeset:

def changeset(struct, params \\ %{}) do
  struct
  |> cast(params, [:email, :first_name, :last_name, :password_hash, :role, :birthdate, :address1, :address2, :city, :state, :zip, :status, :mobile, :card, :sms_code, :status])
  |> check_constraint(
    :users_table,
    name: :email_or_mobile,
    message: dgettext("errors", "can't be blank")
  )
end