cancan ability

ABILITY.rb

class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new #guest user

    can :manage, :all if user.role == "owner"
    
    if user.role == "employee"
        can :read, Company
        can :create, Project

        can :read, [Project] do |project|
            project.tasks.try(:user_id) == user.id
        end
        
        can :manage, Project do |project|
            project.try(:owner_id) == user.id
        end
        
        can :create, Task
        can :manage, Task do |task|
            task.try(:user_id) == user.id     
        end
    end

    if user.role == nil
        can :manage, :all
    end
  end

 end   

show.html.erb

<div class="row" style="border-bottom: 1px solid #9d9d9d; padding-bottom: 10px;">
	<aside class="span9 co_header_bar" style="margin-left: -3px;">
		<h1> 
			<%= @company.name %>&nbsp;
			
				<%= link_to "+ Project", new_company_project_path(@company), class: "btn btn-medium btn-primary" %> 

		</h1>
	</aside>
	
	<% if can? :manage, @company %>
	<aside class="span2 co_header_bar_links pull-right">
		&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<%= link_to ' ', [:edit, @company], :class => 'icon-pencil' %>
	</aside>
	<% end %>
</div>

<br>

<% @projects.each do |c| %>
<% if can? :manage, c %>
 <div class="row">

		<aside class="span9 co_header_bar">
				
					<%= c.name %> 
					<%= link_to "+ Task", new_company_project_task_path(@company, c), class: "btn btn-medium btn-primary" %> <!--span class="sub_text_list"><%#= pluralize(c.tasks.count, "task") %></span--> 

		</aside>
		<aside class="span2 co_header_bar_links pull-right">
	
				<%= link_to ' ', [@company, c], :class => 'icon-eye-open' %>&nbsp;&nbsp;&nbsp;
				<%= link_to ' ', [:edit, @company, c], :class => 'icon-pencil' %>&nbsp;&nbsp;&nbsp;
				<%= link_to ' ', [@company, c], method: :delete , data: { confirm: "Are you sure?" }, :class => 'icon-trash' %>
	
		</aside>
</div>
<% end %>

<% c.tasks.each do |t| %>
<% if can? :manage, t %>
<div class ="row task_list">
	<li>
		<aside class="span9">
			<section>
				<%= t.content %><span class="sub_text_list">&nbsp;&nbsp;&nbsp; <%= t.user.name %>, Due: <%= t.due_date %></span>
			</section>
		</aside>
		<aside class="span2 pull-right">
			<section>
				<%= link_to 'View', [@company, c, t], :class => 'btn btn-mini' %>
				<%= link_to 'Edit', [:edit, @company, c, t], :class => 'btn btn-mini' %>
				<%= link_to "Delete", [@company, c, t], method: :delete , data: { confirm: "Are you sure?" }, :class => 'btn btn-mini btn-danger' %>
			</section>
		</aside>
	</li>
</div>
<% end %>
<% end %>
<br>
<% end %>