How to manage nested relation in RoR? - ruby-on-rails

Question

I'm new to Rails and trying to create an C2C marketplace App just to understand how rails works and start some real project later on.
The idea is that User can place Order to other User. Orders is related with user's Printer (you choice user where you want to print on /order page). Printer in its turn have many colors to print
For now, Im stack with very basic things.
I want to display list of all printers with owner's name and colors available on /order page in Orders controller. Thank you in advance for any ideas how I can do this
class User < ActiveRecord::Base
has_many :printers, dependent: :destroy
has_many :orders, dependent: :destroy
end
class Order < ActiveRecord::Base
belongs_to :user
validates :user_id, presence: true
end
class Printer < ActiveRecord::Base
belongs_to :user
validates :user_id, presence: true
validates :model, presence: true, allow_nil: true
has_many :materials, dependent: :destroy
end
Orders controller with index action (/orders)
class OrdersController < ApplicationController
def index
#printers = Printer.all
end
end
And index.html.erb
<% #printers.each do |p| %>
<div class="col-xs-9">
<div><%= "USERNAME HERE" %></div> <!--Do not know how to display parent's model here? -->
<div><%= p.model %></div> <!--Works fine-->
<div><%= p.colors.each do |c| c.color end %></div> <!--Display array instead of strings-->
</div>
<div class="col-xs-3">
<button>Order</button>
</div>
<% end %>
Simplified schema.db
ActiveRecord::Schema.define(version: 20160627132435) do
create_table "colors", force: :cascade do |t|
t.string "color"
t.integer "printer_id"
end
create_table "orders", force: :cascade do |t|
t.string "price"
t.string "status"
t.integer "user_id"
end
create_table "printers", force: :cascade do |t|
t.string "model"
t.integer "user_id"
end
add_index "printers", ["user_id"], name: "index_printers_on_user_id", using: :btree
create_table "users", force: :cascade do |t|
t.string "first_name"
t.string "last_name"
end
add_foreign_key "orders", "users"
add_foreign_key "printers", "users"
end

Answer 1

I think you should be able to do:
<% #printers.each do |p| %>
<div class="col-xs-9">
<div><%= p.user.first_name %></div> <!--Do not know how to display parent's model here? -->
<div><%= p.model %></div> <!--Works fine-->
<div><% p.colors.each do |c|
<%= c.color %>
<% end %></div> <!--Display array instead of strings-->
</div>
<div class="col-xs-3">
<button>Order</button>
</div>
<% end %>