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Ruby of Rails - cleanly displaying model data in the view

The display of data from our model has - thus far - been formatted in the Controller (when that really ought be in the view) and has been liable to fail to display properly if the data contains HTML special characters such as < and &. The solution to this is provided for you by rails - simply pass through the model object to be displayed to the view, and use the h method therein to "webify" the data.

1. Pass the complete object that you want to display through the controller into the view

  def single
    @main_result = "-"
    stockdata = Product.all
    stockdata.each do |stock|
      if stock.pname == params[:name] # Params is from a "form"
        @info = stock
      end
    end
  end


2. In the view, use the h function on individual member fields to ensure that they're cleaned on output

  <h1>Single Record Report</h1>
  To revert to product list: <b><%= @main_result %></b><br /><br />
  All about the product: <b><%= h @info.pname %></b><br />
    Price: <%= h @info.unitprice %><br />
    Quantity: <%= h @info.stocklevel %>
    <br /><br />



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)

 
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)
  [3779] Adding validation to form entries and sticky fields - Ruby on Rails - (2012-06-23)
  [3778] Providing a form to allow the user to add data to the model - 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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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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