Rails中的多个提交按钮/表单

<%= form_with(model: @post, local: true) do |form| %>
  <!-- form fields here -->

  <%= form.submit "Save", name: "commit", value: "save" %>
  <%= form.submit "Preview", name: "commit", value: "preview" %>
<% end %>

def create
  @post = Post.new(post_params)

  case params[:commit]
  when "save"
    if @post.save
      redirect_to @post, notice: 'Post was successfully created.'
    else
      render :new
    end
  when "preview"
    # handle preview here
  end
end