_fields.html.erb

<tr>
	<td><%= f.label :first_name %></td>
	<td><%= f.text_field :first_name %></td>
	<td><%= f.label :last_name %></td>
	<td><%= f.text_field :last_name %></td>
</tr>
<tr>
	<td><%= f.label :health_card %></td>
	<td><%= f.text_field :health_card %></td>
	<td><%= f.label :medical %></td>
	<td><%= f.text_field :medical %></td>
</tr>
<tr>
	<td><%= f.label :grade %></td>
	<td><%= f.text_field :grade %></td>
	<td><%= f.label :class %></td>
	<td><%= f.text_field :class %></td>
</tr>
<tr>
	<td><%= f.label :campus %></td>
	<td><%= f.text_field :campus %></td>
	<td></td>
	<td></td>
</tr>
<tr>
	<td><%= f.label :emergency_first_name %></td>
	<td><%= f.text_field :emergency_first_name %></td>
	<td><%= f.label :emergency_last_name %></td>
	<td><%= f.text_field :emergency_last_name %></td>
</tr>
<tr>
	<td><%= f.label :emergency_phone %></td>
	<td><%= f.text_field :emergency_phone %></td>
	<td><%= f.label :shoe_size %></td>
	<td><%= f.text_field :shoe_size %></td>
</tr>

child.rb

class Child < ActiveRecord::Base
  belongs_to :user
  
  attr_accessible :first_name,
                  :last_name,
                  :health_card,
                  :medical,
                  :grade,
                  :class,
                  :campus,
                  :emergency_first_name,
                  :emergency_last_name,
                  :emergency_phone,
                  :shoe_size
end

children_controller.rb

class ChildrenController < ApplicationController
  
  def new
    @child = Child.new
  end
  
  def create
    @child = Child.new(params[:child])
    if @child.save
      flash[:success] = "Your child was entered into the system successfully."
      redirect_to new_child_path
    else
      render 'new'
    end
  end
  
end

Console log

Started GET "/children/new" for 127.0.0.1 at 2012-03-24 22:47:09 -0400
Processing by ChildrenController#new as HTML
Completed 500 Internal Server Error in 34ms

NoMethodError (undefined method `attribute_method_matcher' for nil:NilClass):
  app/controllers/children_controller.rb:4:in `new'
  app/controllers/children_controller.rb:4:in `new'

new.html.erb

<% provide(:title, 'Register children') %>
<h2>Register your children</h2>

<%= form_for(@child) do |f| %>
<table>
	<%= render 'fields', f: f %>
	  <div class="actions">
	    <%= f.submit "Register new child" %>
	  </div>
	<% end %>
</table>

schema.rb

# Excerpted from schema

  create_table "children", :force => true do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.string   "health_card"
    t.string   "grade"
    t.string   "class"
    t.string   "campus"
    t.string   "shoe_size"
    t.string   "emergency_first_name"
    t.string   "emergency_last_name"
    t.string   "emergency_phone"
    t.integer  "parent_id"
    t.text     "medical"
    t.text     "pickup_info"
    t.datetime "created_at",           :null => false
    t.datetime "updated_at",           :null => false
  end

How did you end up resolving this? I'm getting the same error. =(

Oh yeah, I remember this. My problem was I'd named a field "class", which conflicts with the Ruby keyword "class". I had to rename it to child_class or something along those lines.

I thought I'd checked for that, but I guess not. Thanks so much!

…

On Jun 27, 2012 8:24 AM, "andrewhl" < ***@***.***> wrote: Oh yeah, I remember this. My problem was I'd named a field "class", which conflicts with the Ruby keyword "class". I had to rename it to child_class or something along those lines. --- Reply to this email directly or view it on GitHub: https://gist.github.com/2190915

Hello I am having this same issue I scaffold and everyting and when I try to run my New form I get this error. So the solution is just to change the field class?

That fixed it for me, yes.

…

On Mon, Jul 2, 2012 at 1:50 PM, drriley < ***@***.*** > wrote: Hello I am having this same issue I scaffold and everyting and when I try to run my New form I get this error. So the solution is just to change the field class? --- Reply to this email directly or view it on GitHub: https://gist.github.com/2190915