Hi,
Looking at LiveView and Surface examples I created a first test Component to a Login form (code below).

It appears that this code fails with the following error:

** (exit) an exception was raised:
    ** (ArgumentError) argument error
        :erlang.atom_to_binary("email", :utf8)
        (phoenix_ecto 4.2.1) lib/phoenix_ecto/html.ex:111: Phoenix.HTML.FormData.Ecto.Changeset.input_value/4
        (phoenix_html 2.14.3) lib/phoenix_html/form.ex:482: Phoenix.HTML.Form.input_value/2
        (phoenix_html 2.14.3) lib/phoenix_html/form.ex:825: Phoenix.HTML.Form.generic_input/4
        (surface 0.4.0) lib/surface/components/form/email_input.ex:31: anonymous fn/7 in Surface.Components.Form.EmailInput.render/1
        (phoenix_live_view 0.15.5) lib/phoenix_live_view/diff.ex:356: Phoenix.LiveView.Diff.traverse/6

I’m not used with forms validation using changeset. Can someone help me with this one ?

defmodule ScubananaWeb.Components.LoginForm do
  defmodule FormData do
    use Ecto.Schema
    import Ecto.Changeset

    @primary_key false
    embedded_schema do
      field :email, :string
      field :password, :string
    end

    def changeset(form_data, attrs \\ %{}) do
      form_data
      |> cast(attrs, [:email, :password])
      |> validate_required([:email, :password])
      |> validate_email()
    end

    defp validate_email(changeset) do
      changeset
      |> validate_format(:email, ~r/^[^\s]+@[^\s]+$/,
        message: "must have the @ sign and no spaces"
      )
      |> validate_length(:email, max: 160)
    end

    def validate(params) do
      %FormData{}
      |> changeset(params)
      |> Map.put(:action, :insert)
    end
  end

  defmodule Component do
    use Surface.LiveComponent

    alias Surface.Components.Form
    alias Surface.Components.Form.{Field, Label, EmailInput, PasswordInput}

    data changeset, :changeset, default: FormData.changeset(%FormData{})
    prop submit, :event

    def render(assigns) do
      IO.inspect(assigns.changeset)

      ~H"""
      <Form for={{ @changeset }} change="validate" submit={{ @submit }}>
        <Field name="email" class="form-control w-1/2">
          <Label class="label"><span class="label-text">Email</span></Label>
          <EmailInput class="input input-bordered flex-grow"/>
        </Field>
        <Field name="password" class="form-control w-1/2">
          <Label class="label"><span class="label-text">Password</span></Label>
          <PasswordInput class="input input-bordered flex-grow"/>
        </Field>
        <div class="card-actions w-1/2 mt-4">
          <button type="submit" class="btn btn-primary flex-grow">Login</button>
        </div>

      </Form>
      """
    end

    def handle_event("validate", params, socket) do
      {:noreply, assign(socket, changeset: FormData.validate(params))}
    end
  end
end