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redirect_to post_url(@post), :alert => "Watch it, mister!" redirect_to post_url(@post), :status=> :found, :notice => "Pay attention to the road" redirect_to post_url(@post), :status => 301, :flash => { :updated_post_id => @postid } redirect_to { :action=>'atom' }, :alert => "Something serious happened"

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Remember that redirect and render statements don t magically halt execution of your controller action method To prevent DoubleRenderError, consider explicitly calling return after redirect_to or render like this:

def show @user = Userfind(params[:id]) if @useractivated render :action => 'activated' and return end end

In non-Microsoft environments, the task of banning dangerous functions is not hard, either The following header le entries rede ne a handful of inherently dangerous functions with the pre x unsafe_, which turns calls to these functions into compile warnings and link errors

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When a view template is rendered, it generally uses data that the controller has pulled from the database In other words, the controller gets what it needs from the model layer, and hands it off to the view The way Rails implements controller-to-view data handoffs is through instance variables Typically, a controller action initializes one or more instance variables Those instance variables can then be used by the view There s a bit of irony (and possible confusion for newcomers) in the choice of instance variables to share data between controllers and views The main reason that instance variables exist is so that objects (whether Controller objects, String objects, and so on) can hold on to data that they don t share with other objects When your controller action is executed, everything is happening in the context of a controller object an instance of, say, DemoController or EventController Context includes the fact that every instance variable in the code belongs to the controller instance

When the view template is rendered, the context is that of a different object, an instance of ActionView::Base That instance has its own instance variables, and does not have access to those of the controller object So instance variables, on the face of it, are about the worst choice for a way for two objects to share data However, it s possible to make it happen or make it appear to happen What Rails does is to loop through the controller object s variables and, for each one, create an instance variable for the view object, with the same name and containing the same data It s kind of labor-intensive, for the framework: It s like copying over a grocery list by hand But the end result is that things are easier for you, the programmer If you re a Ruby purist, you might wince a little bit at the thought of instance variables serving to connect objects, rather than separate them On the other hand, being a Ruby purist should also include understanding the fact that you can do lots of different things in Ruby such as copying instance variables in a loop So there s nothing really un-Ruby-like about it And it does provide a seamless connection, from the programmer s perspective, between a controller and the template it s rendering Stephen says

#define #define #define #define gets unsafe_gets strcpy unsafe_strcpy strcat unsafe_strcat sprintf unsafe_sprintf

I m a cranky old man, and dammit, Rails is wrong, wrong, wrong Using instance variables to share data with the view sucks If you want to see how my Decent Exposure library helps you avoid this horrible practice, skip ahead to Section 1015

Filters enable controllers to run shared pre and post processing code for its actions These filters can be used to do authentication, caching, or auditing before the intended action is performed Filter declarations are macro style class methods, that is, they appear at the top of your controller method, inside the class context, before method definitions We also leave off the parentheses around the method arguments, to emphasize their declarative nature, like this:

As with many other macro-style methods in Rails, you can pass as many symbols as you want to the filter method:

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