Question

I have 2 tables in my database, Companies & Users. I have one list (displayed as table) which lists out all the companies. Now I want to insert a link in the each row which could take the user to another list (displayed as table) which shows only those users belonging to the particular company row ?

Companies list

<table>
<% @companies.each do |company| %>
  <tr>
    <td><%= company.Name %></td>
    <td><%= company.addressline1 %></td>
    <td><%= company.addressline2 %></td>
    <td><%= company.City %></td>
    <td><%= company.postcode %></td>
    <td><%= company.Telephone %></td>
    <td><%= link_to 'Edit', edit_company_path(company) %></td>
    <td><%= link_to "Users", url_for(:users) %></td>  
  </tr>
<% end %>
</table>

Users list

<table>
<% @users.each do |user| %>
  <tr>
    <td><%= user.username %></td>
    <td><%= user.email %></td>
    <td><%= UserType.find(user.user_type_id).user_type_name %></div>
    <td><%= check_box_tag(user, user.is_admin, user.is_admin) %></div>
    <td><%= check_box_tag(user, user.active_status, user.active_status) %></div>
    <td><%= link_to 'Edit',  edit_user_path(user) %></td>
  </tr>

<% end %>

Answer 1

There are various ways to do this. You can start by adding a simple route:

match 'companies/:company_id/users' => 'users#for_company', :as => :company_users

And in your UsersController:

def for_company
  @users = Company.find(params[:company_id]).users
  render :action => :index
end

And in your companies list view change the link to:

<td><%= link_to "Users", company_users_path(company) %></td>

Once you have this in place and working, you may want to consider alternative ways to setup the route. For instance, you might want users to be a nested resource under companies. See here for more info on this.