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One of the most powerful features of Rails is the ability to form associations between different data models In the case of our User model, each user potentially has many microposts We can express this in code by updating the User and Micropost models as in Listing 210 and Listing 211

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13 You might notice that the HTML Validator indicates an error; annoyingly, the default Rails error messages are not valid HTML

Description Draws generic and isoceles triangles using the Triangle \Template\TriangleDrawingjava template pattern Program

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This is a hint that we will be defining a signed_in method that returns true if a user is signed in and false otherwise Moreover, the signed_in method will be attached to the controller, not to a user, which is why we write controllersigned_in instead of current_usersigned_in (If no user is signed in, how could we call signed_in on it ) To start writing the code for current_user, note that the line

Read Cisco's advisory, from which this excerpt is taken, at http://wwwciscocom/warp/public/707/cisco-sa-20030717-blockedshtml

is an assignment Ruby has a special syntax for defining such an assignment function, shown in Listing 914

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The Visitor pattern turns the tables on our OO model and creates an external class to act on data in other classes This is useful when you have a polymorphic operation that cannot reside in the class hierarchy for some reason For example, the operation wasn't considered when the hierarchy was designed or because it would clutter the interface of the classes unnecessarily

module SessionsHelper def sign_in(user) end def current_user=(user) @current_user = user end end

This might look confusing, but it simply defines a method current_user= expressly designed to handle assignment to current_user Its one argument is the right-hand side of the assignment, in this case the user to be signed in The one-line method body just sets an instance variable @current_user, effectively storing the user for later use In ordinary Ruby, we could define a second method, current_user, designed to return the value of @current_user (Listing 915)

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While at first it might seem "unclean" to put operations that should be inside of a class in another class instead, there are good reasons for doing this Suppose that each of a number of drawing object classes has similar code for drawing itself The drawing methods might differ, but they probably all use underlying utility functions that you might have to duplicate in each class Further, a set of closely related functions is scattered throughout a number of different classes, as shown in Figure 261 Figure 261 A DrawObject and three of its subclasses

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module SessionsHelper def sign_in(user)

If we did this, we would effectively replicate the functionality of attr_accessor, first seen in Section 445 and used to make the virtual password attribute in Section 7117 The problem is that it utterly fails to solve our problem: with the code in Listing 915, the user s signin status would be forgotten: as soon as the user went to another page poof! the session would end and the user would be automatically signed out To avoid this problem, we can find the session user corresponding to the cookie created by the code in Listing 912, as shown in Listing 916

Instead, you can write a Visitor class that contains all of the related draw methods and have it visit each object in succession (Figure 262) Figure 262 A Visitor class (Drawer) that visits each of three triangle classes

module SessionsHelper def current_user @current_user ||= user_from_remember_token end private def user_from_remember_token Userauthenticate_with_salt(*remember_token) end def remember_token cookiessigned[:remember_token] || [nil, nil] end end

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