http://api.rubyonrails.com/classes/ActionView/Helpers/FormHelper.html
example taken form the above link:
# Note: a @person variable will have been created in the controller.
# For example: @person = Person.new
<% form_for :person, @person, :url => { :action => "create" } do |f|
%>
<%= f.text_field :first_name %>
<%= f.text_field :last_name %>
<%= submit_tag 'Create' %>
<% end %>
what you got is this:
<% form_for(@advertisement, :html => { :multipart => true }) do |f|
%>
<%= f.text_field :title %>
<%= f.text_area :description %>
<%# ... %>
<%= f.submit 'Submit' %>
now try changing your first line to:
<% form_for :advertisement, @advertisment, :url => { :action =>
"create" }, :html => { :multipart => true } do |f| %>
hope this helps.
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