edit.erb

<h2>Edit Artist</h2>

<form action='/artists/<%= "#{@artist.id}" %>' method="post">
  <label for="artist[name]">Name:</label>
  <input name="artist[name]" value='<%= "#{@artist.name}" %>'>

  <label for="artist[photo_url]">Photo URL:</label>
  <input name="artist[photo_url]" value='<%= "#{@artist.photo_url}" %>'>

  <label for="artist[nationality]">Nationality:</label>
  <input name="artist[nationality]" value='<%= "#{@artist.nationality}" %>'>

  <input type="submit" value="Create">
</form>