Simple error in my rails app - ruby

Question

I have an error in my rails app telling me that the index method is undefined.
I have created a such simple form just for inserting data using the (new method page) only
but it is not working now for some reason
class PeoplesController < ApplicationController
def index
end
def new
#people = People.new
end
def create
#people = People.new(params[:#people])
if #people.save
redirect_to new_people_path
end
end
end
# new.html.haml
<h2>Hello there!</h2>
<hr >
<%= form_for #people do |f| %>
FirstName:<%= f.text_field :first %><br />
LastName:<%= f.text_field :last %><br />
<%= f.submit %>
<% end %>
Here is the error code:
NoMethodError in Peoples#new
Showing /Users/kasim/Desktop/form/app/views/peoples/new.html.erb where line #3 raised:
undefined method `people_index_path' for #<#<Class:0x007fa33da58d58>:0x007fa34031c578>
Extracted source (around line #3):
1: <h2>Hello there!</h2>
2: <hr >
3: <%= form_for #people do |f| %>
4: FirstName:<%= f.text_field :first %><br />
5: LastName:<%= f.text_field :last %><br />
6: <%= f.submit %>

Answer 1

The documentation for form_for says that a form_for call is equivalent to this
<%= form_for #post, :as => :post, :url => post_path(#post), :method => :put, :html => { :class => "edit_post", :id => "edit_post_45" } do |f| %>
...
<% end %>
Notice that the url attribute is calling out to a named route. In your case it appears the named route is people_index_path. I'd run rake routes and make sure that the named route in question really exists.