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C ha P ter 13 W eB a PP LI C a t I O N F r a M e W O r K S : r a I LS , S I N a t r a , a N D r a M a Z e

The important parts to look at are the calls to the link_to method. link_to is a special method provided by Rails that generates an HTML link to another controller and/or action within the application. Let s look at the first line: <td><%= link_to 'Show', entry %></td> Whereas the general Ruby code in the view is located within <% and %> tags, Ruby code that results in something to be rendered in the document (that is, shown on the web page) is included within <%= and %> tags (as in the earlier <%=h entry.title %> column). The link_to method accepts the text to use for the link, and then it accepts parameters that specify where the link should go. Prior to Rails 2.0, this was always in the form of hash, such as :controller => "entries", :action => "show", :id => entry.id, where these sections would be used to form a URI such as /entries/show/1234. You can still take this approach if you like, but in more recent versions of Rails, shortcuts have been implemented so that if you re performing the standard CRUD operations, you can use shortcut names that will produce the URLs you want without having to write all of those parameters. In the <%= link_to 'Show', entry %> case, link_to assumes that since it has been passed an entry object, you want to link to the page that will show only that entry specifically /entries/[id of entry].

of entry] rather than /entries/show/ [id of entry], since there is a show method in the entries controller. The reason lies in how Rails default

Norm: Well, clearly you ve broken the grammar definition in at least a couple of ways, since it is no longer generating M Graph output in the right pane. From what you see in the error list, it thinks the word with is a Lunchmeat token. Here s what I d suggest. Let s not add condiments into the system for the time being, and instead focus on refining the Lunchmeat and Bread syntax so that you get rid of the Blue on Blue problem, and the system is smart enough to exclude nonsense orders like ham on pastrami, even though ham and pastrami are both valid token values. Lola: Makes sense. One thing at a time. Norm changes the token definitions for Lunchmeat and Bread to be collections of a few of the sandwich makings that comprise some sandwiches on Lola s menu. And he removes the condiment fragment from the last order to keep things simple. Figure 3-21 shows the result.

this.btnManaged.Click += new RoutedEventHandler(btnManaged_Click); } void btnManaged_Click(object sender, RoutedEventArgs e) { throw new NotImplementedException(); } private void Button_Click(object sender, RoutedEventArgs e) { txtXAMLEventText.Text = "Thank you for clicking!"; } } } 6. Now the only thing left to do is add the code to the event handler. You will

In the second example, <%= link_to 'Edit', edit_entry_path(entry) %>, the edit_entry_path shortcut method is used (with the entry object as a parameter) to provide the hash of parameters to link to /entries/[id of entry]/edit. The last example, <%= link_to 'Destroy', entry, :confirm => 'Are you sure ', :method => :delete %>, provides the entry object, as with the show version, but the HTTP DELETE method is specified using the :method parameter, so link_to is smart enough to realize you probably want to direct the link to the destroy method of the entries controller in this case. Separate from these shortcuts, however, let s look at how the parameters of link_to can be manipulated directly to get the results you want. Let s build up a link_to example in a few steps showing some example view code and what it would render given those examples (assuming a basic Entry object is present in the entry variable): <%= entry.id %> 3