Nested Forms Tutorial: How do you display the Tasks in the Project Index and Show Views?

I am trying to display the Tasks on the Products#index and get Type Error in Projects#index
"can't cast Enumerator"

How can I display attributes from tasks on the Products views?

Here's my code -
ProjectsController:

def index
@projects = Project.all
@projects_id = @projects.find(:project_id)
@tasks = Project.where(:project_id => @projects_id).all
end

Projects#index:
<% @tasks.each do |task| %>
<%= task.description %>
<% end %>

AddIndexToTask migration:
def change
add_index :tasks, :project_id
end

I got it working.

def index
@projects = Project.all
end

Projects#index:

<% project.tasks.each do |task| %>
<%= task.description %>
<% end %>

Thanks @eelcoj ! I caught that and it still wouldn't work so I dropped the two lines in the controller. Then used project.tasks.each block in the index so I didn't have to create an instance variable after all.