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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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Another handy URL helper is link_to, which creates a hyperlink tag of the given name using a URL constructed according to the options hash given. It acts exactly like url_for, except that it produces an HTML hyperlink. It s possible to pass a string instead of an options hash to get a link tag that points to any URL. Additionally, if nil is passed as a name, the link itself will become the name. Here s the fine print:
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link_to(name, link={}, options={})
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This generates an HTML anchor tag using the following parameters: The first argument is the link s name. The second argument is the URL to link to, given either as a string or a hash of options used to generate the URL. The third argument is a hash of options for the resulting tag. In Ruby, if the last argument to a method is a hash, the curly braces are optional. Most link_to helpers will therefore look like this:
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link_to 'New', :controller => 'events', :action => 'new'
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or, if using a named route, like this:
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link_to 'New', new_event_url
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If you re using all three arguments and are passing in options for HTML (like a class or id attribute), you need to disambiguate them. Consider the following example where we re using two hashes: one for the URL generation and another for the HTML options:
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link_to 'New', {:controller => 'articles', :action => 'new'}, :class => 'large'
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Notice that we need to use the curly braces for at least the first hash to inform Ruby that there are three arguments. Using braces on the last hash of options is still optional, and we could just have easily included them:
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link_to 'New', {:controller => 'articles', :action => 'new'}, {:class => 'large'}
Escaping HTML in Templates
You should always escape any HTML before displaying it in your views to prevent malicious users from injecting arbitrary HTML into your pages (which is how cross-site scripting attacks are often carried out). The rule of thumb is that whenever you have data
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
that is provided by the user, you can t trust it blindly. You need to escape it. This includes your model attributes, as well as parameters. Fortunately, escaping is easy to do. While not technically a Rails helper, ERb provides a utility method to escape entities in HTML called escape_html. It s aliased to h for short, and it s easy to use. Here s an example:
<%=h @event.title %> <%= link_to h(@event.title), event_url(event) %>
Let s update the _event.rhtml partial to make sure everything is properly escaped, as shown in Listing 6-24.
Listing 6-24. HTML Escaping Added in app/views/events/_event.rhtml
<div class="event item"> <h3 class="title"><%= link_to h(event.title), event_url(event) %></h3> <ul> <li><%=h event.occurs_on %></li> <li><%=h event.location %></li> </ul> <div class="description"> <%=h event.description %> </div> </div>
Formatting a Description Field
While we re working with the _event partial, let s improve the display of the description field. One of the aforementioned text helpers is the simple_format helper. The simple_ format helper converts text to HTML using simple formatting rules. Two or more consecutive newlines are considered as a paragraph and wrapped in <p> tags. One newline is considered as a line break and a <br /> tag is appended. We ll also use the sanitize helper to make sure there are no gremlins in the description before we format it. Listing 6-25 shows the additions.
Listing 6-25. Formatting Helpers Added in app/views/events/_event.rhtml
<div class="description"> <%= simple_format(sanitize(event.description)) %> </div>
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
Adding Edit Controls
We ve applied our authentication filters, but we still don t have a way to prevent users from editing or deleting events that belong to other users. To do this, we ll add a method to the Event model that can tell us whether the event in question is owned by the user we pass in. When we re finished, we ll be able to ask an event whether it s owned by the current user. Open the Event model and add the owned_by method, as highlighted in bold in Listing 6-26.
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