RoR wrong number of arguments (0 for 1) form - ruby-on-rails

Question

Hi I'm trying to create a form, that at the same time, creates a list and associates products to it.
The problem is that the form keeps raising
wrong number of arguments (0 for 1)
Extracted source (around line #10):
7: <%= f.text_area :description, placeholder:
8: "Compose a description for it ..." %>
9: </div>
10: <%= l.fields_for :products do |builder| %>
11: <%= render 'shared/product_form', :l => builder %>
12: <% end %>
13: <%= l.submit "Create", class: "btn btn-large btn-primary" %>
App Trace is
app/views/shared/_list_form.html.erb:10:in `block in _app_views_shared__list_form_html_erb__184644094_33330696'
app/views/shared/_list_form.html.erb:1:in `_app_views_shared__list_form_html_erb__184644094_33330696'
app/views/lists/new.html.erb:7:in `_app_views_lists_new_html_erb__973495114_33282228'
The code is as follows:
---view----
--list_form--
<%= form_for(#list) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div class="field">
<%= f.text_field :name, placeholder:
"Come up with a name for your list" %>
<%= f.text_area :description, placeholder:
"Compose a description for it ..." %>
</div>
<%= f.fields_for :products do |builder| %>
<%= render 'shared/product_form', :f => builder %>
<% end %>
<%= f.submit "Create", class: "btn btn-large btn-primary" %>
<% end %>
--product_form--
<%= f.text_field :name, "Name:" %>
<%= f.text_area :description, :rows => 3 %>
---model---
--list--
class List < ActiveRecord::Base
attr_accessible :description, :name
belongs_to :user
has_many :products, :dependent => :destroy
accepts_nested_attributes_for :products, :reject_if => lambda { |a| a[:name].blank? }, :allow_destroy => true
has_many :list_categorization
has_many :category, :through => :list_categorization
validates :user_id, presence: true
validates :name, presence: true, length: {maximum: 10}
validates :description, length: {maximum: 140}
default_scope order: 'lists.created_at DESC'
def categorize!(category_id)
list_categorization.create!(category_id: category_id)
end
end
--product--
class Product < ActiveRecord::Base
attr_accessible :description, :donated, :name
validates :list_id, presence: true
belongs_to :list
end
---controllers---
--list_controller--
def new
#list = List.new
#products = #list.products.build
end
def create
#list = current_user.lists.build(params[:list]) if signed_in?
if #list.save
flash[:success] ="List " + #list.name + "created!"
render 'new'
end
--product_controller--
def new
#product = Product.new
end
def create
#product = #product.build(params[:product]) if signed_in?
if #product.save
flash[:success] ="Product " + #product.name + "created!"
end
You were right, I actually realized it after posting this, but now while trying to submit the form this happens:
The form contains 1 error.
* Name can't be blank
event tough I filled it correctly, this is what is getting passed
--- !ruby/hash:ActiveSupport::HashWithIndifferentAccess
utf8: ✓
authenticity_token: 38CXjVORlj2RBgoTetIMoHomcVgOIlBU5rW3NTgkRkU=
list: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
name: list
description: this is a list
products_attributes: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
'0': !ruby/hash:ActiveSupport::HashWithIndifferentAccess
name: p1
description: this is a product
commit: Create
action: create
controller: lists

Answer 1

Where did that l come from? I'm pretty sure you need to change it to f:
<%= form_for(#list) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div class="field">
<%= f.text_field :name, placeholder: "Come up with a name for your list" %>
<%= f.text_area :description, placeholder: "Compose a description for it ..." %>
</div>
<%= f.fields_for :products do |builder| %>
<%= render 'shared/product_form', :l => builder %>
<% end %>
<%= f.submit "Create", class: "btn btn-large btn-primary" %>
<% end %>
Update
There are a few problems with your code. First of all when you call #list = current_user.lists.build(params[:list]) if signed_in? it means that if there is no user signed in that object won't be created at all. The proper way to do something like this would be with a before_filter in your controller.
Secondly #product = #product.build(params[:product]) won't work. You haven't initialized a Product object yet, and you haven't assigned it to #product yet. Also build is used for associations. You need to change this to #product = Product.new(params[:product]).
Lists controller:
before_filter :user_signed_in? # add to products controller as well
# if you need this filter only on certain actions then do:
# before_filter :user_signed_in?, only: [:new, :create]
def new
#list = current_user.lists.build
#products = #list.products.build
end
def create
#list = current_user.lists.build(params[:list])
if #list.save
flash[:success] = "List " + #list.name + " created!"
redirect_to lists_path # this part was missing!
else # this was also missing
render 'new'
end # you had an 'if' with no 'end'
end
private
# add the following to Products controller as well, or if you
# use it a lot then place it in your application controller
def user_signed_in?
unless signed_in?
flash[:notice] = "You must first sign in"
redirect_to sign_in_path
end
end
Products controller:
def new
#product = Product.new
end
def create
#product = Product.new(params[:product]
if #product.save
flash[:success] = "Product " + #product.name + " created!"
redirect_to #product
else
render 'new'
end
end
As far as I remember however, the products#create action won't be used when saving a product through a nested form, the lists#create action will be used for both.
To learn more about nested forms have a look at these railscasts.
Once you've updated your code and gone through those videos, if you're still getting errors I would recommend to create a new question since this one is getting long and messy already :)

Answer 2

you forgot to do this:
rails generate migration add_remember_token_to_users