Rails - Mar 2011 - How born an error studing a forum

I''m studing a forum and when I create a Topic I have a _form.html.erb
relative a file inside follow directory

#app/views

new.html.erb
_form.html.erb
....
....

the snippet controller to create a new topic is the follow

#app/controllers/topics_controller.rb

 def create
    @topic = Topic.new(params[:topic])
    if @topic.save
      @topic = Topic.new(:name => params[:topic][:name], :forum_id =>
params[:topic][:forum_id])

        if @post.save
        flash[:notice] = "Successfully created topic."
        redirect_to "/forums/#{@topic.forum_id}"
        else
        render :action => ''new''
        end
    else
     render :action => ''new''
    end
  end
########

but when I create a topic on the webinterface of the app I receive the
following error message:

#####
Showing /home/user/forum/app/views/topics/_form.html.erb where line #9
raised:

undefined method `content'' for :post:Symbol

Extracted source (around line #9):

6:      <%= f.text_field :name %>
7:    </p>
8:    <p>
9:    <%= f.text_area :post.content %><%= @post.content %>  
</p>
10:    <p><%= f.submit "Create" %></p>
11:  <% end %>
#####

It''s a syntax error ?  I''m converting an example app from a
Rails 2 to
Rails 3

thanks,


C

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No need create only 2 simple line in the follow file

#app/controllers/topics_controllers


def new

@topic = Topic.new
@post  =  Post.new

end


def create
 def create
    @topic = Topic.new(params[:topic])
    if @topic.save
      @topic = Topic.new(:name => params[:topic][:name], :forum_id =>
params[:topic][:forum_id])
      @post = Post.new(:content => params[:post][:content], :topic_id => 
Topic.first.id)
        if @post.save
        flash[:notice] = "Successfully created topic."
        redirect_to "/forums/#{@topic.forum_id}"
        else
        render :action => ''new''
        end
    else
     render :action => ''new''
    end
  end
########

bye to me

C

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