Providing a form to allow the user to add data to the model

So far, we have implemented a single model - view - controller application using Ruby on Rails, and displayed the data in several forms. How do we add new data? We need to provide an "add product" form, and code to handle that form when it's submitted. Building on the example so far, here's how:
Adding in a form for "add product"

1. Add a link (to index.erb?) for add product:

To add a product - go <a href=addproduct>[here]<

2. Add an "addproduct" method to the controller

  def addproduct

    @main_result = "This is where we add a product - initial form"

    @newprod = Product.new

    @info = ""

  end

3. Add the view for that form (app/views/productlister/addproduct.erb )

  <h1>All records report</h1>

  Here is a message: <b><%= @main_result %></b><br /><br />

  Here is the "add product" form to fill in:<br />

  <% form_for(@newprod, :url => "/productlister/saveproduct") do |fieldname| %>

    Name of product	<%= fieldname.text_field :pname %><br />

    Price Each <%= fieldname.text_field :unitprice %><br />

    Initial Stock Held <%= fieldname.text_field :stocklevel %><br />

    <%= fieldname.submit "Done!" %><br />

  <% end %><br />

4. Add a saveproduct method to the controller

  def saveproduct 

    @main_result = "Saving a new product"

    @newprod = Product.new(params[:product])

    if @newprod.save

      redirect_to :action => "index"

    else

      redirect_to :action => "addproduct" # error handling - next article

    end

  end

(no need to provide a template because it sends it back to the index)

5. Try it!

This is one of a series of summaries taking you from initial installation of Ruby and Rails through to a complete multitable application:
[link] - Installing Ruby and Rails
[link] - Hello World, Ruby on Rails Style
[link] - What and Why - Model, View, Controller
[link] - Multiple views, same model
[link] - A form to allow data to be added to the model
[link] - Validating data entries for storage in the model
[link] - Cleanly viewing model data
[link] - Complete sample, including a multiple table model
These topics are covered on our Introduction to Rails day - an optional extension of Ruby Programming or Learning to program in Ruby

(written 2012-06-23) 221c

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

R202 - Ruby on Rails
  [4013] Web Frameworks - nested templates - (2013-02-22)
  [4010] Really Simple Rails - (2013-02-17)
  [3919] What is a web framework? - (2012-11-10)
  [3780] Ruby of Rails - cleanly displaying model data in the view - (2012-06-23)
  [3779] Adding validation to form entries and sticky fields - Ruby on Rails - (2012-06-23)
  [3777] Multiple views in a single appication - sharing common parts of the template - Ruby on Rails - (2012-06-23)
  [3772] Hello World - Ruby on Rails - a checklist of each step - (2012-06-22)
  [3756] Ruby on Rails - how it flows, and where the files go - (2012-06-08)
  [3624] Why do we need a Model, View, Controller architecture? - (2012-02-25)
  [2609] Scope of variables - important to Ruby on Rails - (2010-01-31)
  [2607] Answers on Ruby on Rails - (2010-01-30)
  [2605] Ruby on Rails - a sample application to teach you how - (2010-01-30)
  [1745] Moodle, Drupal, Django (and Rails) - (2008-08-08)
  [1375] Python v Ruby - (2007-10-02)
  [1302] Ruby, Ruby, Ruby. Rails, Rails, Rails. - (2007-08-13)
  [1050] The HTML++ Metalanguage - (2007-01-22)

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Adding validation to form entries and sticky fields - Ruby on Rails

Some other Articles

Standard methods available on all objects in Ruby
Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby?
Providing a form to allow the user to add data to the model - Ruby on Rails
Some traps it's so easy to fall into in designing your web site
Alan Turing - 1912 to 1954
Melksham - a new dawn
Ruby on the web - a simple example using CGI

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