qr code generator c# source code Note You might wonder why it directs to /entries/[id in Visual C#

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routing system works. I ll go into this more shortly.
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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
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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
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<%= entry.content %> This is an example entry.
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Ch aPt er 13 W eB a P P L IC a tION Fr a MeW O r K S : r a I LS , S I N a t r a , a N D r a M a Z e
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<%= link_to 'Show', :action => 'show' %>
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<a href="/entries/show">Show</a>
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<%= link_to entry.title, :action => 'show', :id => entry.id %>
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<a href="/entries/show/3">Example Entry</a>
<%= link_to 'Show', :action => 'show', :id => entry.id %>
<a href="/entries/show/3">Show</a> It s important to understand how these examples work, as many elements of views rendered by Rails will contain patterns such as these, whether for generating links, including images, or creating forms to post data back to your application. At this stage, you might be wondering why you can t just write the HTML you want directly into views and then build up the links manually. For example: <a href="/entries/show/<%= entry.id %>"><%= entry.title %></a> instead of: <%= link_to entry.title, :action => 'show', :id => entry.id %> The simple answer is you can! Stylistically, however, Rails developers prefer to let Rails helper methods (such as link_to) do the work of putting together fragments of HTML that might need to change in the future. For example, in the future you might choose to change the entries part of the URLs to entry for some reason or another, and with Rails you could just make some changes to the application s routing to do this. The links generated by helpers such as link_to would then automatically reflect the new conventions, whereas if you coded them with HTML, as previously, you d have a lot of searching and replacing to do in your views!
Creating a New action and View
Let s use the basic knowledge you ve gathered so far to create your own controller action and view from scratch to show all your diary entries in full on a single page in a diary or blog-style layout. Creating a new method is as easy as adding a method to the controller of your choice. Add the following method to app/controllers/entries_controller.rb: def view_all @entries = Entry.all(:order => 'created_at DESC') end This code defines a method (and therefore, a controller action) called view_all that contains a single line that retrieves all the entries from your database, ordered in chronologically
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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
descending order (like a blog). The order is defined by the optional :order parameter. ActiveRecord methods, such as find, all, and first, have many useful optional parameters such as these to get the results you desire. You can learn all about them from the official Ruby on Rails documentation, as there are too many to cover here. You also need to tell the Rails routing system (the system that sends incoming request to the correct controllers and methods) that you have defined a new method that may be called on the entries controller. This is necessary because the entries controller has been defined as a resource upon which many default routes have been created (and this same process of defining a resource has created the shortcut methods, such as edit_entry_path).
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