I think I'm pretty close now. There are 3 files involved:
app/contollers/info_controller.rb which contains:
class InfoController < ApplicationController
def who_bought
if params[:id] == nil then
@products = Product.all
respond_to do |format|
format.html
format.xml { render :xml => @products }
end
else
@product = Product.find(params[:id])
@orders = @product.orders
respond_to do |format|
format.html
format.xml { render :layout => false , :xml => @product.to_xml
(:include => :orders) }
end
end
end
end
app/views/info/who_bought.html.erb which contains:
if @products != nil then
<% for product in @products %>
<a href="http://localhost:3000/info/who_bought/"+<%=h product.id %>
+".html"><%=h product.title %></a>
<% end %>
else
<h3>People Who Bought <%= @product.title %></h3>
<ul>
<% for order in @orders -%>
<li>
<%= mail_to order.email, order.name %>
</li>
<% end -%>
</ul>
end
app/views/info/index.html.erb which contains:
<h3>Info Functions</h3>
<a href="http://localhost:3000/info/who_bought";>Who Bought</a>
The problem is that when I visit http://localhost:3000/info/who_bought/
I get the following error screen:
NoMethodError in Info#who_bought
Showing app/views/info/who_bought.html.erb where line #6 raised:
You have a nil object when you didn't expect it!
The error occurred while evaluating nil.title
Extracted source (around line #6):
3: <a href="http://localhost:3000/info/who_bought/"+<%=h
product.id %>+".html"><%=h product.title %></a>
4: <% end %>
5: else
6: <h3>People Who Bought <%= @product.title %></h3>
7: <ul>
8: <% for order in @orders -%>
9: <li>
And I think I know why this is happening. I think that the if
statement test in who_bought.html.erb is always causing the execution
to fall into the else clause. My question is what test statement will
give me what I want?
Arthur
On Apr 16, 10:19 am, Ar Chron <[email protected]>
wrote:
> eengnerd wrote:
> > I've completed the chapter on Internationalization successfully, but
> > found out just recently that the "Who Bought" function produces an
> > error page that looks very ugly when someone enters a product ID that
> > does not exist. My preference would be to design the app to have a
> > list of hyperlinks presented when you visit the URL,
> >http://localhost:3000/info/
> > that describes the list of "Info Functions" (eg "Who Bought" for
> > starters). Then when it takes you there,
> >http://localhost:3000/info/who_bought/
> > you would see a list of Book Titles as hyperlinks so that when you
> > click on a book title, it redirects you to the appropriate URL for
> > seeing a list of customers "who bought" that book. In this way I
> > could avoid the user's temptation to use "non-existent" product ID's
> > before it becomes a problem. But I have no idea how to go about
> > creating these features. I'm open to some ideas.
>
> > Arthur
>
> Sounds like the hard part is done, now it's just coding...
>
> So, where does ...info/ go to?
>
> You'll need a view for that (info.html.erb?), and you'll have to get
> there somehow (think routes) via some controller (which to use... or
> create?)
>
> The list of book titles for 'Who Bought' smells an awful lot like a
> generic book 'index' view, with maybe a twist on the rendering in the
> erb.
>
> If a book knows who bought it, listing the people who bought a book
> smells like an adaptation of a book 'show' view.
>
> Just get that info page working, then extend from there.
> --
> Posted viahttp://www.ruby-forum.com/.
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