this might help?

index.rb

get '/' do
  # Create Account
  company_name = "Company_" + rand(1000000).to_s
  new_account = Account.create(name: company_name)

# not sure whats going on here?
#  new_account.name = "1 "+ company_name
#  new_account.save!
  
  # Create User
  user_name = "Frank_"+ rand(1000000).to_s
#  user.password = "pass"
  
  new_account.users.create(user_name: user_name, password: "pass") 

#  user.save
#  
#  new_account.users = [user]
#  new_account.save
  
  # not changing this since the embedded nature its best to just save the document once
  
  # Create Standard Item
  new_standard = Standard.new(name: "American Apparel "+rand(10000).to_s)
  new_price = Price.new(base_cost: 1000, quantity: 25, colors:1)
  new_price2 = Price.new(base_cost: 1000, quantity: 50, colors:1)
  new_standard.prices << new_price
  new_standard.prices << new_price2
  new_standard.save
  
  # Create Item -> Use StandardItem
  new_item = new_standard.items.create(description: "This shirt rocks ",name: "Threads Shirt ")

#you had:
#  new_item = Item.new(description: "This shirt rocks ",name: "Threads Shirt ")
#  new_item.standard = new_standard
#  #new_item.save
  
  # Create File
  new_item.myfiles.create(url: "http://teespring.com/uploads/2013/04/28/23/46102/shirtFront.jpg?v=2013-04-28%2023%3A16%3A28", 
                          name:"file"+rand(1000).to_s, 
                          location:"Front")
#you had:  
#  new_file = Myfile.new(url: "http://teespring.com/uploads/2013/04/28/23/46102/shirtFront.jpg?v=2013-04-28%2023%3A16%3A28" , name:"file"+rand(1000).to_s, location:"Front")
#  new_file.save
#  new_item.myfiles = [new_file]
#  new_item.save
  
  # Add Item to Account
  new_account.items << new_item
  new_account.save
  
  # Create Order - Restock
    # Check for quantity 
  
  # Create Inventory
  #new_inventory = Inventory.new()
  
  # Create Order - Inventory
  
  puts "After output account: "
  @accounts = Account.all
  erb :index
end