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POBuild Associations Rails 3.1
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copied!<p>Anytime I create a user and log in this exception is thrown on the redirect: <code>Couldn't find User without an ID</code>. </p> <p>I have a <code>has_many</code> association like so:</p> <pre><code>class Post < ActiveRecord::Base has_many :tags belongs_to :user attr_accessible :title, :description, :content, :tags_attributes accepts_nested_attributes_for :tags, allow_destroy: true, reject_if: lambda {|attrs| attrs.all? {|key, value| value.blank?}} end </code></pre> <p>followed by:</p> <pre><code>class User < ActiveRecord::Base has_many :posts attr_accessible :codename, :password, :password_confirmation end </code></pre> <p>There is a third model 'Tags' which has a <code>belongs_to post</code> but that does not appear to be causing the problem. There is also a SessionsController with <code>new</code>,<code>create</code>, and <code>destroy</code> actions (code below). </p> <p>The <code>find_user</code> method is run only on the new and create actions in the PostsController</p> <pre><code>before_filter :find_user def find_user @user = User.find(params[:user_id]) end def new @post = @user.posts.build(tags: Tag.new) respond_to do |format| format.html end end def create @post = @user.posts.build(params[:post]) @tags = @post.tags.build(params[:tags]) respond_to do |format| if @post.save format.html { redirect_to @post, notice: 'Post was successfully created.' } else format.html { render action: :new } end end end </code></pre> <p>and the User.authenticate method / SessionsController <code>create</code> action</p> <pre><code>def self.authenticate(codename, password) user = User.find_by_codename(codename) unless user && user.authenticate(password) raise "You are not who you say you are." end user end def create session[:user_id] = User.authenticate(params[:codename], params[:password]).id redirect_to action: session[:intended_action], controller: session[:intended_controller], success: "You're In!" end </code></pre>

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