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As should be obvious, you call the page_title method in your view template where you want to have an h1 element:
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- page_title "New User" = error_messages_for :user = form_for(:user, :url => users_path) do |f|
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11222 Encapsulating View Logic: The photo for Helper
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Here s another relatively simple helper This time, instead of simply outputting data, we are encapsulating some view logic that decides whether to display a user s profile photo or a placeholder image It s logic that you would otherwise have to repeat over and over again throughout your application The dependency (or contract) for this particular helper is that the user object being passed in has a profile_photo associated to it, which is an attachment model based on Rick Olson s old attachment_fu Rails plugin28 The code in Listing 118 should be easy enough to understand without delving into the details of attachment_fu Since this is a code example, I broke out the logic for setting src into an if/else structure; otherwise, this would be a perfect place to use Ruby s ternary operator
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28 The WillPaginate plugin can be found at http://requireerrtheblogcom/plugins/browser/will_ paginate, but you knew that already, since all Rails developers subscribe to Err the Blog
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Helpers
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11: All About Helpers
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Listing 118 The photo for helper encapsulating common view logic def photo_for(user, size=:thumb) if userprofile_photo src = userprofile_photopublic_filename(size) else src = 'user_placeholderpng' end link_to(image_tag(src), user_path(user)) end
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Tim says
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Luckily, the latest generation of attachment plugins such as Paperclip and CarrierWave use a NullObject pattern to alleviate the need for you to do this sort of thing
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11223 Smart View: The breadcrumbs Helper
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Lots of web applications feature user-interface concepts called breadcrumbs They are made by creating a list of links, positioned near the top of the page, displaying how far the user has navigated into a hierarchically organized application I think it makes sense to extract breadcrumb logic into its own helper method instead of leaving it in a layout template The trick to our example implementation (shown in Listing 119) is to use the presence of helper methods exposed by the controller, on a convention specific to your application, to determine whether to add elements to an array of breadcrumb links
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Listing 119 breadcrumbs Helper Method for a Corporate Directory Application 1 def breadcrumbs 2 return if controllercontroller_name == 'home' 3 4 5 html = [link_to('Home', root_path)] # first level html << link_to(companyname, company) if respond_to :company
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6 # second level 7 html << link_to(departmentname, department) if respond_to :department 8 9 # third and final level html << link_to(employeename, employee) if respond_to :employee
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1123 Wrapping and Generalizing Partials
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10 htmljoin(' > ')html_safe 11 end
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Here s the line-by-line explanation of the code, noting where certain applicationdesign assumptions are made: On line 2, we abort execution if we re in the context of the application s homepage controller, since its pages don t ever need breadcrumbs A simple return with no value implicitly returns nil, which is fine for our purposes Nothing will be output to the layout template On line 3 we are starting to build an array of HTML links, held in the html local variable, which will ultimately hold the contents of our breadcrumb trail The first link of the breadcrumb trail always points to the home page of the application, which of course will vary, but since it s always there we use it to initialize the array In this example, it uses a named route called root_path After the html array is initialized, all we have to do is check for the presence of the methods returning objects that make up the hierarchy (lines 4 to 9) It is assumed that if a department is being displayed, its parent company will also be in scope If an employee is being displayed, both department and company will be in scope as well This is not just an arbitrary design choice It is a common pattern in Rails applications that are modeled on REST principles and using nested resource routes Finally, on line 10, the array of HTML links is joined with the > character, to give the entire string the traditional breadcrumb appearance The call to html_safe tells the rendering system that this is HTML code and we re cool with that don t sanitize it!
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