form.html.haml not rendering on new.html.haml - ruby

Question

I'm working from the book 'Agile Web Development with Rails 4' and I'm having some difficulty with my HAML code.
I'm not too sure what I've done wrong, but my form isn't rendering when I go to build a new product. I check the source code and it's not in the HTML either so something is wrong with my code but not sure what. Hopefully someone can help me.
This is my code for Form.html.haml
=if #product.errors.any?
%div{ :id => "error_explanation" }
%h2
=pluralize(#product.errors.count, "error")
prohibited this product from being saved:
%ul
=#product.errors.full_messages.each do |msg|
%li
=msg
%div{ :class => "field" }
=f.label :title
=f.text_field :title
%div{ :class => "field" }
=f.label :description
=f.text_area :description, rows: 6
%div{ :class => "field" }
=f.label :image_url
=f.text_field :image_url
%div{ :class => "field" }
=f.label :price
=f.text_field :price
%div{ :class => "actions" }
=f.submit
And this is my New.html.haml
%h1 New Product
=render 'form'
=link_to 'Back', products_path
Thank you in advance.

Answer 1

According to the answers provided by meagar and theTRON as well as your last comment:
Where are you bringing to light the form object? It seems like nowhere, thus you are getting that error. When you bind a form to a model object through the form_for method, it yields a form builder object (the f variable).
Try something like the following:
<%= form_for #product, url: {action: "create"} do |f| %>
# your code using f variable ...
<% end %>
Let us know if that finally fixed your code.

Answer 2

Partials need to be named with an _ prefix.
Your Form.html.haml must be called _form.html.haml.

Answer 3

In addition to ensuring that your form is named _form.html.haml you'll need to fix some nesting in your HAML. It should look something like this instead:
=if #product.errors.any?
%div{ :id => "error_explanation" }
%h2
=pluralize(#product.errors.count, "error")
prohibited this product from being saved:
%ul
=#product.errors.full_messages.each do |msg|
%li
=msg
%div{ :class => "field" }
=f.label :title
=f.text_field :title
%div{ :class => "field" }
=f.label :description
=f.text_area :description, rows: 6
%div{ :class => "field" }
=f.label :image_url
=f.text_field :image_url
%div{ :class => "field" }
=f.label :price
=f.text_field :price
%div{ :class => "actions" }
=f.submit
Your indentation that you currently have on your form fields placed it in the scope of the if #product.errors.any? block, which means the form would only appear if #product had errors.