Question

I’d like to basically do what Twitter’s stream does – have the create action and index action available on the same page, but I’m now getting an error, NilClass from the form.

Here’s my view, then my code

class MistakesController < ApplicationController

  respond_to :html, :xml, :json

  before_filter :authenticate_user!

  def index
    @mistakes = Mistake.all
    @user = current_user

    respond_to do |t|
      t.html
    end
  end

  def create

    @mistake = Mistake.new(params[:mistake])
    @mistake.user = current_user

    respond_to do |f|
      if @mistake.save
        f.html { redirect_to("/", :notice => 'cool') }
      else
        f.html { render :action => 'new' }
      end
    end
  end

  def new
    @new_mistake = Mistake.new
  end

  def show
    @mistake = Mistake.find(params[:id])
  end

end

and index.html.haml

%p test
%p= @user.email
= link_to "Create", new_mistake_path
- semantic_form_for @mistake do |form|
  = form.inputs :name => "Basic" do
    = form.input :message
    = form.input :notes
  = form.inputs :name => "Topics" do
    = form.input
  = form.buttons do
    = form.commit_button

I’m starting to go through the growing pains of creating a non-trivial rails app so any help would be great.

Thanks

EDIT:

Error Info

Message

undefined method `model_name' for NilClass:Class

Occurs when I view index.html.haml.

Answer 1

Try adding this to the index action of your controller

@mistake = Mistake.new

This is required in addition to the @mistakes variable you already have there…