Looping through a nested attribute with external model details - ruby-on-rails

Question

three-months-in beginner with Ruby on Rails here, so I apologize if any of my terminology is incorrect. I have a question about referencing outside models from a nested attribute.
I have three models. Tasks with nested attributes for Task Products, and a separate Items table with pre-populated products.
Each Task has many Task Products, and the Task Product has a "product_id" column which is in reference to an existing product in the Item table. In creating an table index of each Task, I am having trouble figuring out how to have the nested Task Product's product_id's list out the Item instead of just the bare id.
Here's the code I'm working with:
tasks_controller.rb -->
def dashboard
#tasks = Task.includes(:task_products, :storeorder).last(100)
#tasks.each do |task|
task.storeorder do |storeorder|
end
task.task_products.each do |task_product|
#item = Item.where(:id => task_product.product_id)
end
end
end
task.rb -->
class Task < ApplicationRecord
has_many :task_products
accepts_nested_attributes_for :task_products
end
task_product.rb -->
class TaskProduct < ApplicationRecord
belongs_to :task
has_many :items
end
item.rb -->
class Item < ActiveRecord::Base
belongs_to :task_product
def item_select
"#{vendor_name} (#{description})"
end
end
dashboard.html.erb -->
<td>
<% t.task_products.each do |tp| %>
# Existing code that lists each task product in a list on the table:
<p><%= tp.product_id %></p>
# The ideal code I would like to run:
<p><%= link_to #item.item_select, item_path(id: #item.id) %>
<% end %>
</td>
Any ideas how I can run the #item call as it pertains to the 'tp.product_id' code in the html file?
Appreciate any help I can get. Searching for this issue has left me with many purple links, but none of which address this particular issue.
EDIT: In case anybody happens upon this that was in the same predicament as me, I have one recommendation: Learn your associations.
Updated code:
tasks_controller.rb -->
def dashboard
#tasks = Task.includes(:task_products, :storeorder).last(100)
end
task.rb -->
class Task < ApplicationRecord
has_many :task_products
accepts_nested_attributes_for :task_products
end
task_product.rb -->
class TaskProduct < ApplicationRecord
belongs_to :task
belongs_to :item, foreign_key: :product_id
end
item.rb -->
class Item < ActiveRecord::Base
has_many :task_products, foreign_key: :product_id
def item_select
"#{vendor_name} (#{description})"
end
end
dashboard.html.erb -->
<td>
<% t.task_products.each do |tp| %>
<% tp.items.each do |item| %>
<p><%= link_to item.item_select, item_path(item) %></p>
<% end %>
<% end %>
</td>

Answer 1

First, by using Item.where in your controller, you're actually setting #item to a collection of Items. Second, by setting it inside a loop, you're overwriting it with each TaskProduct, so only the last one will be accurate in the view.
I'm assuming you want to list [a subset of] every Item for every Task. In that case, you'd be better not to set them in your controller at all:
def dashboard
#tasks = Task.includes(:task_products, :storeorder).last(100)
end
Instead, just loop through them in the view:
<% #tasks.each do |t| %>
Task <%= t %>
<% t.task_products.each do |tp| %>
TaskProduct <%= tp %>
<% tp.items.each do |item| %>
<p><%= link_to item.item_select, item_path(item) %></p>
<% end %>
<% end %>
<% end %>

Answer 2

I don't see any need of all the loops in your dashboard_controller.rb
#tasks.each do |task|
task.storeorder do |storeorder|
end
task.task_products.each do |task_product|
#item = Item.where(:id => task_product.product_id)
end
end
Here's what you need in html.erb:
# The ideal code I would like to run:
<% tp.items.each do |item| %>
<p><%= link_to item.item_select, item_path(item) %>
<% end %>