Unexpected lack of validation

_form.rb

<ul>
  <li><%= f.label :name %>: <%= f.text_field :name %></li>
	<li><%= f.label :url %>: <%= f.text_field :url, :size => 100 %></li>
  <li><%= f.label :slot %>: <%= f.select :equipmentSlot, @slots %></li>
  <li><%= f.label :weight %>: <%= f.text_field :weight %></li>
  <li><%= f.label :price %>: <%= f.text_field :price %></li>
  <li><%= f.label :rarity %>: <%= f.text_field :rarity %></li>
  <li><%= f.label :speed %>: <%= f.text_field :speed %></li>
  <li><%= f.label :armor_type %>: <%= f.text_field :armorType %></li>
  <li><%= f.label :armor_check %>: <%= f.text_field :armorCheck %></li>
  <li><%= f.label :enhancement_bonus %>: <%= f.text_field :enhancementBonus %></li>
  <li><%= f.label :armor_bonus %>: <%= f.text_field :armorBonus %></li>
  <li><%= f.label :is_light_armor %>: <%= f.check_box :isLightArmor %></li>
  <li><%= f.label :is_equipped %>: <%= f.check_box :isEquipped %></li>
  <li><%= f.label :property %>: <%= f.text_area :property %></li>
</ul>

equipment.rb

class Equipment < ActiveRecord::Base
  belongs_to :character
  has_friendly_id :name, :use_slug => true, :scope => :character
  validates_presence_of :name, :speed# , :armorCheck, :enhancementBonus, :armorBonus, :level
  validates_numericality_of :speed# , :armorCheck, :enhancementBonus, :armorBonus
  
  class Slots
    UNKNOWN   = 0
    ARMOR     = 1
    ARMS      = 2
    FEET      = 3
    HANDS     = 4
    HEAD      = 5
    NECK      = 6
    RINGS     = 7
    TATTOO    = 8
    WAIST     = 9
    WONDROUS  = 10
  end
  
  def after_save
    character.defenses.each do |defense|
      defense.calculate_total
    end
  end

end

equipments_controller.rb

class EquipmentsController < ApplicationController

  def new
    @user = User.find(params[:user_id])
    @character = @user.characters.find(params[:character_id])
    @equipment = @character.equipments.new

    @slots = '<option '+(@equipment.equipmentSlot == 0 ? 'SELECTED' : '')+' value="0">Unknown</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 1 ? 'SELECTED' : '')+' value="1">Armor</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 2 ? 'SELECTED' : '')+' value="2">Arms</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 3 ? 'SELECTED' : '')+' value="3">Feet</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 4 ? 'SELECTED' : '')+' value="4">Hands</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 5 ? 'SELECTED' : '')+' value="5">Head</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 6 ? 'SELECTED' : '')+' value="6">Neck</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 7 ? 'SELECTED' : '')+' value="7">Rings</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 8 ? 'SELECTED' : '')+' value="8">Tattoo</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 9 ? 'SELECTED' : '')+' value="9">Waist</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 10 ? 'SELECTED' : '')+' value="10">Wondrous</option>'
  end

  def create
    @user = User.find(params[:user_id])
    @character = @user.characters.find(params[:character_id])
    @equipment = @character.equipments.new(params[:equipment])

    if @equipment.save
      flash[:pass] = "Equipment \"#{@equipment.name}\" was successfully created."
      redirect_to user_character_url(@user, @character, { :section => 'items' })
    else
      flash[:fail] = 'Equipment creation failed.'
      render :action => "new"
    end
  end

  def edit
    @user = User.find(params[:user_id])
    @character = @user.characters.find(params[:character_id])
    @equipment = @character.equipments.find(params[:id])
    logger.info("EQUIPMENT URL: #{@equipment.url}")

    @slots = '<option '+(@equipment.equipmentSlot == 0 ? 'SELECTED' : '')+' value="0">Unknown</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 1 ? 'SELECTED' : '')+' value="1">Armor</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 2 ? 'SELECTED' : '')+' value="2">Arms</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 3 ? 'SELECTED' : '')+' value="3">Feet</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 4 ? 'SELECTED' : '')+' value="4">Hands</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 5 ? 'SELECTED' : '')+' value="5">Head</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 6 ? 'SELECTED' : '')+' value="6">Neck</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 7 ? 'SELECTED' : '')+' value="7">Rings</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 8 ? 'SELECTED' : '')+' value="8">Tattoo</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 9 ? 'SELECTED' : '')+' value="9">Waist</option>'
    @slots += '<option '+(@equipment.equipmentSlot == 10 ? 'SELECTED' : '')+' value="10">Wondrous</option>'
  end

  def update
    @user = User.find(params[:user_id])
    @character = @user.characters.find(params[:character_id])
    @equipment = @character.equipments.find(params[:id])

    if @equipment.update_attributes(params[:equipment])
      flash[:pass] = "Equipment \"#{@equipment.name}\" successfully updated."
      redirect_to user_character_url(@user, @character, { :section => 'items' })
    else
      flash[:fail] = 'Equipment update failed. #{@equipment.errors.full_messages.join(', ')}'
      render :action => 'edit'
    end
  end

  def destroy
    @user = User.find(params[:user_id])
    @character = @user.characters.find(params[:character_id])
    @equipment = @character.equipments.find(params[:id])
  
    if @equipment.destroy
      flash[:pass] = "Equipment \"#{@equipment.name}\" successfully deleted."
    else
      flash[:fail] = 'Equipment deletion failed.'
    end
    redirect_to user_character_url(@user, @character, { :section => 'items' })
  end

end

error ouput

NoMethodError in Equipments#update

Showing app/views/equipments/_form.erb where line #4 raised:

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.inject
Extracted source (around line #4):

1: <ul>
2:   <li><%= f.label :name %>: <%= f.text_field :name %></li>
3: 	<li><%= f.label :url %>: <%= f.text_field :url, :size => 100 %></li>
4:   <li><%= f.label :slot %>: <%= f.select :equipmentSlot, @slots %></li>
5:   <li><%= f.label :weight %>: <%= f.text_field :weight %></li>
6:   <li><%= f.label :price %>: <%= f.text_field :price %></li>
7:   <li><%= f.label :rarity %>: <%= f.text_field :rarity %></li>
Trace of template inclusion: app/views/equipments/edit.html.erb

RAILS_ROOT: /Users/mpattee/Documents/source/i4e_import

Application Trace | Framework Trace | Full Trace
/opt/local/lib/ruby/gems/1.8/gems/actionpack-2.3.11/lib/action_view/helpers/form_options_helper.rb:292:in `options_for_select'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-2.3.11/lib/action_view/helpers/form_options_helper.rb:533:in `to_select_tag'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-2.3.11/lib/action_view/helpers/form_options_helper.rb:128:in `select'
/opt/local/lib/ruby/gems/1.8/gems/actionpack-2.3.11/lib/action_view/helpers/form_options_helper.rb:583:in `select'
/Users/mpattee/Documents/source/i4e_import/app/views/equipments/_form.erb:4:in `_run_erb_app47views47equipments47_form46erb_locals_f_form_object'
/Users/mpattee/Documents/source/i4e_import/app/views/equipments/edit.html.erb:2:in `_run_erb_app47views47equipments47edit46html46erb'
/Users/mpattee/Documents/source/i4e_import/app/views/equipments/edit.html.erb:1:in `_run_erb_app47views47equipments47edit46html46erb'
/Users/mpattee/Documents/source/i4e_import/app/controllers/equipments_controller.rb:64:in `update'
Request

Parameters:

{"x"=>"44",
 "y"=>"17",
 "_method"=>"put",
 "authenticity_token"=>"FzsxHw8/3SlumMleg2Q/hAdUURgn3DLkshW/YpCZiJA=",
 "id"=>"62577",
 "user_id"=>"mpatteegmailcom",
 "equipment"=>{"name"=>"Delver's Leather Armor +2",
 "price"=>"",
 "isEquipped"=>"1",
 "property"=>"",
 "rarity"=>"Common",
 "armorBonus"=>"2",
 "armorType"=>"Leather",
 "url"=>"http://www.wizards.com/dndinsider/compendium/item.aspx?fid=558&ftype=1",
 "weight"=>"15",
 "equipmentSlot"=>"1",
 "speed"=>"",
 "enhancementBonus"=>"2",
 "armorCheck"=>"0",
 "isLightArmor"=>"1"},
 "character_id"=>"20385"}
Show session dump

Response

Headers:

{"Content-Type"=>"text/html",
 "Cache-Control"=>"no-cache"}