Phoenix LiveView slot attributes

Today I learned how to define an attribute on a Phoenix LiveView slot using a do block:

slot :column
  attr :field, :atom
  attr :sortable, :boolean, default: false
end

def table(assigns) do
  ~H"""
  <table>
    <tr>
      <th :for={col <- @column}>
        <%= col.label %>
        <.sort_by :if={col.sortable} field={col.field}/>
      </th>
    </tr>
  </table>
  """
end

This way we can use our slots with attributes:

def render(assigns) do
  ~H"""
    <.table>
      <:colum field={:name} sortable>Name</:colum>
      <:colum field={:price}>Price</:colum>
      <:colum>Actions</:colum>
      ...
    </.table>
  """
end

Check this out