Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Ruby Ruby Collections Build a Grocery List Program Build a Grocery List Program: Part 3

Asa Smith
Asa Smith
10,009 Points
Posted by Asa Smith
Asa Smith
10,009 Points

Undefined method 'push' I keep getting this error. Any idea why?

def create_list
  print "What is the list name? "
  name= gets.chomp

  hash = { "name" => name, "items:" => Array.new }
  return hash
end

def add_list_item
  print "What is the item called? "
  item_name = gets.chomp

  print "How much?"
  quantity = gets.chomp.to_i

  hash = { "name" => item_name, "quantity" => quantity }
 end

def print_list(list)
  puts "List: #{list['name']}"
  puts "____"

  list["items"].each do |item|
    puts "Item: " + item['name']
    puts "Quantity: " + ['quantity'].to_s
    puts "___"
  end
end

list = create_list()
puts list.inspect
list['items'].push(add_list_item())


puts list.inspect

print_list(list)

3 Answers

Grace Kelly
Grace Kelly
33,990 Points
Grace Kelly
Grace Kelly
33,990 Points

Hi Asa, I think the issue is on these lines:

 hash = { "name" => name, "items:" => Array.new }

list["items"].push(add_list_item())

If you rename "items:" to "items" when you declare the hash, your code should execute, and it will also correspond with how you named "name" :)

Asa Smith
Asa Smith
10,009 Points
Asa Smith
Asa Smith
10,009 Points

That was it. Thanks!

jeffdelacruz2
jeffdelacruz2
2,516 Points
jeffdelacruz2
jeffdelacruz2
2,516 Points

Here's what I got to work. 

def create_list
  print "What is the list name? "
  name = gets.chomp

  hash = { "name": name, "items":Array.new } #since name & the array are not strings, you must reference them as symbols with the : later in the code.  I think that's the issue here.  
  return hash
end

def add_list_item
  print "What is the item called? "
  item_name = gets.chomp

  print "How Much? "
  quantity = gets.chomp.to_i

  hash = {"name": item_name, "quantity": quantity }
  return hash
end

def print_list(list)
  puts "List: #{list[:name]}" #Change 'name' to :name
  puts "----"

 list[:items].each do |item|
    puts "Item: " + item[:name] #Change 'name' to :name
    puts "Quantity: " + item[:quantity].to_s #Change 'quantity' to :quantity
    puts "---"
end
end

#run the code
list = create_list()
puts list.inspect
list[:items].push(add_list_item()) #Change "items" to :items
print_list(list)