gistfile1.rb

  def destroy
    if params[:ids]
      @models = Model.find(:all, :conditions => { :id => params[:ids] })
      @models.each { |m| m.destroy }
    else
      @model = Tracker.find(params[:id])
      @model.destroy
    end
  end

gistfile2.txt

%h1.heading
  Listing users

= grid(@users_grid,  :show_filters => :always) do |g|
  - g.column :column_name => 'checkbox'
  - g.column :column_name => 'ID', :attribute_name => 'id'
  - g.column :column_name => 'Name', :attribute_name => 'name'
  - g.column :column_name => 'EMail', :attribute_name => 'email'
  - g.column do |user|
    - link_to "Destroy", { :action => :destroy, :id => user.to_param }, :method => :delete, :confirm => "Are you sure?"
  - g.header
    - button_to "Delete selected", { :action => "delete" }, :confirm => "Are you sure?", :method => :delete
  - g.footer
    - button_to "Delete selected", { :action => "delete" }, :confirm => "Are you sure?", :method => :delete

OR (with header/footer columns)

  - g.header
    - g.column
      - button_to "Delete selected", { :action => "delete" }, :confirm => "Are you sure?", :method => :delete