# Models
 
class Agent < ActiveRecord::Base
  belongs_to :manager
  belongs_to :site
  belongs_to :workgroup
end
 
class Manager < ActiveRecord::Base
  has_many :agents
end
 
class Site < ActiveRecord::Base
  has_many :agents
  has_many :managers, :through => :agents, :uniq => true, :order => "managers.name"
  has_many :workgroups, :through => :agents, :uniq => true, :order => "workgroups.name"
end
 
class Workgroup < ActiveRecord::Base
  has_many :agents
  has_many :managers, :through => :agents, :uniq => true, :order => "managers.name"
  has_many :sites, :through => :agents, :uniq => true, :order => "sites.name"
end
 
# Controller
 
class WorkgroupsController < ApplicationController
  def show
    @workgroup = Workgroup.find(params[:id])
  end
end
 
# Existing view
 
<% for site in @workgroup.sites %>
  <h2><em><%= site.name %></em></h2>
  <% for manager in site.managers %>
    <h3><%= manager.name %></h3>
    <ul>
    <% for agent in manager.agents %>
      <li><%= link_to agent.name, agent_path(agent.id) %></li>
    <% end %>
    </ul>
  <% end %>
<% end %>
 
# It's a scoping problem, but I just can't put my finger on it right now.
# Because workgroups can have more than one site, and sites can have more than one workgroup
# not to mention that managers can have agents that span workgroups, this hierarchy breaks down.
 
# I don't think that I want to lock it in a certain way in the associations because I need the flexibility
# later to look at a group of agents by site, manager, or workgroup independently.
 
# New view
 
<% for site in @workgroup.sites %>
  <h2><em><%= site.name %></em></h2>
  <% for manager in site.managers.all(:conditions => ["agents.workgroup_id=?", @workgroup]) %>
    <h3><%= manager.name %></h3>
    <ul>
    <% for agent in manager.agents.all(:conditions => ["agents.workgroup_id=?", @workgroup]) %>
      <li><%= link_to agent.name, agent_path(agent.id) %></li>
    <% end %>
    </ul>
  <% end %>
<% end %>
 
# Looks ugly. Is there a proper way to do this?
 
# Ultimately it should look like this:
# Workgroup
#   Site A
#     Manager 1
#       Agent
#       Agent
#       Agent
#     Manager 2
#       Agent
#       Agent
#       Agent
#   Site B
#     Manager 3
#       Agent
#       Agent
#       Agent
#     Manager 4
#       Agent
#       Agent
#       Agent