Question

So I have been working on a multi-step form in ruby on rails (1.9.3) using Active model, following both the railscast #217 and #219 and am having problems with routing to the next steps in my form from /awizard/new to /awizard/1 hopefully someone can help me out. (I cannot use a form gem and must write this myself) I think this is a routing type issue (and I’m not using the id I give the model but I cannot figure out where I should be using it) a little help would be much appreciated!

My controller code – (contollers/awizard_controller.rb)

class AwizardController < ApplicationController

  def new
    # New Asset Wizard
    @wizard = Awizard.new(id: 1)
    # Set session variable as initial step
    session[:wizard_step] = @wizard.current_step
  end

  def update
    @wizard = Awizard.new(id: 1) unless !@wizard.nil?
    @wizard.current_step = session[:wizard_step] unless nil

    if @wizard.valid?
      if params[:back_button]
        @wizard.previous_step
      elsif @wizard.last_step?
        @wizard.save if @wizard.all_valid?
      else
        @wizard.next_step
      end
      session[:wizard_step] = @wizard.current_step
    end

    if @wizard.changed?
      render 'form'
    else
      @wizard.save
    end
  end

  def show
    render 'form'
  end

end

My Model – (models/awizard.rb)

class AWizard
include ActiveModel::Validations
include ActiveModel::Conversion
include ActiveModel::Dirty
include ActiveModel::Naming

#This class is used to manage the wizard steps using ActiveModel (not ActiveRecord)

attr_accessor :id
attr_writer :current_step  #used to write to current step
define_attribute_methods [:current_step] #used for marking change

def initialize(attributes = {})
   attributes.each do |name, value|
     send("#{name}=", value)
   end
end

def current_step
  @current_step || steps.first
end

def steps
  %w[step1 step2 step3] #make list of steps (partials)
end

def next_step
  current_step_will_change! #mark changed when moving stepped
  self.current_step = steps[steps.index(current_step)+1] unless last_step?
end

def previous_step
  current_step_will_change! #mark changed when moving stepped
  self.current_step = steps[steps.index(current_step)-1] unless first_step?
end

def first_step?
  current_step == steps.first
end

def last_step?
  current_step == steps.last
end

def all_valid?
  steps.all? do |step|
    self.current_step = step
    valid?
  end
end

def step(val)
  current_step_will_change!
  self.current_step = steps[val]
end

def persisted?
  self.id == 1
end

def save
 #will do later
end

end

My views –
(/views/awizard/_form.html.erb)

<%=  content_for :awizard_form do%>
  <%= form_for(@wizard) do |f| %>
    <%= render "#{@wizard.current_step}_step", :f => f %>
    <%= f.submit "Previous", :name => "back_button" unless @wizard.first_step? %>
    <%= f.submit "Continue", :name => "step" unless @wizard.last_step? %>
  <% end %>
<% end %>

(/views/awizard/_step1.html.erb)

<div class="field">
  <%= f.label 'Step1' %><br />
</div>

(/views/awizard/_step2.html.erb)

<div class="field">
  <%= f.label 'Step2' %><br />
</div>

(/views/awizard/_step3.html.erb)

<div class="field">
  <%= f.label 'Step3' %><br />
</div>

Routes code

resources :awizard

Error Message
The error message I get after clicking the first continue button is as so –
“Template is missing

Missing template awizard/form, application/form with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :coffee]}. Searched in: * “fakepath/app/views””

more in depth error log shown below –

Started PUT “/awizard/1” for 127.0.0.1 at 2013-01-07 10:12:06 +1300
Processing by AwizardController#update as HTML
Parameters: {“utf8″=>”✓”, “authenticity_token”=>””, “awizard”=>{“data”=>”data”}, “step”=>”Continue”, “id”=>”1”}
Completed 500 Internal Server Error in 1ms

ActionView::MissingTemplate (Missing template awizard/form, application/form with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :coffee]}. Searched in:
* “fakepath/app/views”
):
app/controllers/awizard_controller.rb:40:in `update’

Rendered fakepath/gems/actionpack-3.2.2/lib/action_dispatch/middleware/templates/rescues/missing_template.erb within rescues/layout (0.6ms)

Answer 1

The error message states , that there is no partial with the name form in the awizard directory. You should stick to the Rails convention about partials – a partial file is always prefixed by underscore .

In your case try to rename form.html.erb to _form.html.erb .

EDIT : You can try to render your partial like this

render :partial => 'awizard/form'