_grid.html.haml

%label Search
%input#filter

%hr

%table.footable{"data-filter" => "#filter"}
  %thead
    %tr
      - if block
        %th
      - headers.each_with_index do |header, index|
        %th
          = header.to_s.humanize
      - if actions
        %th
          Actions
  %tbody
    - collection.each do |obj|
      %tr[obj]
        - if block
          %td
            = block.call(obj)
        - headers.each_with_index do |header, index|
          %td
            = cell_value(obj, header, index)
        - if actions
          %td
            =raw action_links_for(obj).join(" ")

%hr

student_classes_index.html.haml

= form_tag url: school_class_add_multiple_path, method: :post do

  = table_grid_for @students, headers: [:first_name, :last_name, :email] do |student|
    - check_box_tag "student_ids[]", student.id

  %br
  = submit_tag "Add Students", class: 'btn btn-primary'

students_index.html.haml

%h1 All students

= table_grid_for(@students, headers: [:first_name, :last_name, :email, :grade])

table_grid_Helper.rb

module TableGridHelper

  def table_grid_for(collection, options={}, &block)
    collection = collection.to_a.flatten
    headers = options.fetch(:headers)
    include_action = options.fetch(:actions, true)

    render partial: "shared/grid", locals: {
      collection: collection,
      headers: headers,
      actions: include_action,
      block: block
    }
  end

  def cell_value(obj, header, index)
    index.zero? ?  link_to(obj.send(header), obj) : obj.send(header)
  end

  def action_links_for(obj)
    [
      link_to("Edit", [:edit, obj], class: 'btn btn-primary'),
      link_to("Delete", obj, method: :delete, class: 'btn btn-primary')
    ]
  end

end