Ruby on Rails

Hello there,
I am new around here and have been looking over the internet for a
solution but can't find one. I am fair new to rails but have a decent
understanding of it to get by and a few years experience behind me.
My problem is that I try to insert data in a database and it does not
come up. The information the user types is inserted however I wish to
insert the ID and other stuff the user can not change.
This is what I have so far:

The controller:

def create
@postform = new(params[:postform])
@post = Post.new(:title => @postform.title, :body => @postform.body,
:user_id => session[:user_id]).save
respond_to do |format|
if @post.save
format.html { redirect_to(@post, :notice => 'Post was
successfully created.') }
format.xml { render :xml => @post, :status => :created,
:location => @post }
else
format.html { render :action => "new" }
format.xml { render :xml => @post.errors, :status =>
:unprocessable_entity }
end
end
end

View:

<h1>New post</h1>

<%= form_tag :action=>'create' %>
Title: <%= text_field("postform", "title",:size=>"20" ) %>
<br />
Body: <%= text_area("postform", "body",:size=>"20" ) %>
<br />
<%= label("postform", "user_id") %>
<br />
<input type="submit" value="Create" />

<%= link_to 'Back', posts_path %>

Error:

ArgumentError in PostsController#create

wrong number of arguments (1 for 0)

RAILS_ROOT: C:/Users/Jack/Documents/NetBeansProjects/BlogWithUser

Request

Parameters:

{"authenticity_token"=>"ubIO5KeB3WlLD+3hSoLBk4LJSuopsKrgureY6Uq4Rl0=",
"postform"=>{"title"=>"adsf",
"body"=>"adsf"}}

Thank you for your time
Jack
P.S. I tried with the standerd scaffold and that did not work ether (for
what I want to do)
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