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I don t think that partials (by themselves) lead to particularly elegant or concise template code Whenever there s a shared partial template that gets used over and over again in my application, I will take the time to wrap it up in a custom helper method that conveys its purpose and formalizes its parameters If appropriate, I might even generalize its implementation to make it more of a lightweight, reusable component (Gasp!)
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Let s trace the steps to writing a helper method that wraps what I consider to be a general-purpose partial Listing 1110 contains code for a partial for a piece of a user interface that is common to many applications, and generally referred to as a tile It pairs
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a small thumbnail photo of something on the left side of the widget with a linked name and description on the right Tiles can also represent other models in your application, such as users and files As I mentioned, tiles are a very common construct in modern user interfaces and operating systems So let s take the cities tiles partial and transform it into something that can be used to display other types of data
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Listing 1110 A tiles partial prior to wrapping and generalization 1 %tablecitiestiles 2 - citiesin_groups_of(columns) do |row| 3 %tr 4 - roweach do |city| 5 %td[city] 6 left 7 = image_tag(cityphotourl(:thumb)) 8 right 9 title 10 = cityname 11 description 12 = citydescription
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I realize that it has become pass to use HTML tables, and I happen to agree that div-based e layouts plus CSS are a lot more fun and flexible to work with However, for the sake of simplicity in this example, and since the UI structure we re describing is tabular, I ve decided to structure it using a table
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Explanation of the Tiles Partial Code Since we re going to transform this city-specific partial into a generalized UI component, I want to make sure that the code we start with makes absolute sense to you first Before proceeding, I m going through the implementation line by line and explaining what everything in Listing 1110 does Line 1 opens up the partial with a table element and gives it semantically significant CSS classes so that the table and its contents can be properly styled Line 2 leverages a useful Array extension method provided by ActiveSupport, called in_groups_of It uses both of the local variables: cities and columns Both will need to be passed into this partial using the :locals option of the render :partial method The cities variable will hold the list of cities to be displayed, and columns
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is an integer representing how many city tiles each row should contain A loop iterates over the number of rows that will be displayed in this table Line 3 begins a table row using the tr element Line 4 begins a loop over the tiles for each row to be displayed, yielding a city for each Line 5 opens a td element and uses Haml s object reference notation to autogenerate an dom_id attribute for the table cell in the style of city_98, city_99, and so on Line 6 opens a div element for the left side of the tile and has the CSS class name needed so that it can be styled properly Line 7 calls the image_tag helper to insert a thumbnail photo of the city Skipping along, lines 9 10 insert the content for the title div element, in this case, the name and state of the city Line 12 directly invokes the description method
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Calling the Tiles Partial Code In order to use this partial, we have to call render :partial with the two required parameters specified in the :locals hash:
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