Agile Rails (1st edition), depot TDD "exercise"

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I’ve been working my way through the Agile book and just completed
the depot sample application. I learned quite a bit along the way.

On page 171 we are led through the creation of a test (that fails)
for new code. The new code (a search function) is left as an exercise
for the reader. Well, I think I solved it but I’m not sure I did it
right (even though it passes the test).

After much experimentation, here’s what I did:

  1. Edit the depot/app/controller/search_controller.rb file:

class SearchController < ApplicationController

def search
@query =[:query])
@products = Product.find(:all,
:conditions => “title like ‘%#{@query}
%’ OR
description like ‘%#{@query}%’”)

 flash[:notice] = "Found #{@products.size} product(s)."



  1. cp depot/app/views/layout/store.rhtml depot/app/views/layout/

  2. cp depot/app/views/store/index.rhtml depot/app/views/search/

  3. Edit depot/app/views/search/search.rhtml
    Add in another set of

    tags around it so we have as the outermost one. It now looks like:
    <% @products.each do |product| %>

    <%= h product.title %>

    <%= product.description %> <%= fmt_dollars(product.price) %> <%= link_to 'Add to Cart', {:action => 'add_to_cart', :id => product }, :class => 'addtocart' %>
    <% end %>

    <%= link_to “Show my cart”, :action => “display_cart” %>

    1. Change the test so it does “assert_template ‘search/search’”
      instead of “assert_template ‘search/results’”.

    2. There is no step six.

    Was there a better or easier way of accomplishing this task?

    Also, why did the book want to test “assert_template ‘search/
    results’”? That seems like an error to me. The default view for a
    controller’s method (action) has the same name as the action, right?
    Unless you do a “redirect_to :action => ‘results’” in which case the
    “assert_response :success” would now fail because we are redirecting
    to a page with a different name. This really confused me and caused
    me to flail around much longer than necessary to solve this problem.

    Or is the test correct and I can have an action named “search”
    rendered by a view named “results”?


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OK, so I had to do a couple of more installs of Rails on two new servers
today. I realized that my notes were incomplete because I made a couple
of mistakes in the process. So, I’ve updated my wiki page with more
infomation on what I did to get this to work. These troubleshooting
that I added should be a fairly good guide to correcting some of the
common FastCGI and Apache problems that you can encounter on any distro.


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