Helpers in Java

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Helpers
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- content_for :navigation_sidebar do = link_to 'Detail Page', item_detail_path(item)
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content for (name)
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Using this method, you can check whether the template will ultimately yield any content under a particular name using the content_for helper method, so that you can make layout decisions earlier in the template The following example clearly illustrates usage of this method, by altering the CSS class of the body element dynamically:
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%body{:class => content_for (:right_col) 'one-column' : 'two-column'} = yield = yield :right_col
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2 For an interesting read on how yielding content and contentfor will probably change in Rails 31 because of the introduction of content flushing, see http://yehudakatzcom/2010/09/07/automaticflushing-the-rails-3-1-plan
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11: All About Helpers
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116 DateHelper
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The DateHelper module is used primarily to create HTML select tags for different kinds of calendar data It also features one of the longest-named helper methods, a beast peculiar to Rails, called distance_of_time_in_words_to_now
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I guess that helper method name was too much of a mouthful, since at some point it was aliased to time_ago_in_words
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1161 The Date and Time Selection Helpers
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The following methods help you create form field input tags dealing with date and time data All of them are prepared for multiparameter assignment to an Active Record object That s a fancy way of saying that even though they appear in the HTML form as separate input fields, when they are posted back to the server, it is understood that they refer to a single attribute of the model That s some Rails magic for you!
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date select(object name, method, options = {})
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Returns a matched set of three select tags (one each for year, month, and day) preselected for accessing a specified date-based attribute (identified by the method parameter) on an object assigned to the template (identified by the object_name parameter) It s possible to tailor the selects through the options hash, which accepts all the keys that each of the individual select builders do (like :use_month_numbers for select_month) The date_select method also takes :discard_year, :discard_month, and :discard_day options, which drop the corresponding select tag from the set of three Common sense dictates that discarding the month select will also automatically discard the day select If the day is omitted, but not the month, Rails will assume that the day should be the first of the month It s also possible to explicitly set the order of the tags using the :order option with an array of symbols :year, :month, and :day in the desired order Symbols may be omitted and the respective select tag is not included Passing :disabled => true as part of the options will make elements inaccessible for change (see Listing 113)
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116 DateHelper
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Listing 113 Examples of date select date_select("post", "written_on") date_select("post", "written_on", :start_year => 1995, :use_month_numbers => true, :discard_day => true, :include_blank => true) date_select("post", "written_on", :order => [:day, :month, :year]) date_select("user", "birthday", :order => [:month, :day])
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datetime select(object name, method, options = {})
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Works exactly like date_select, except for the addition of hour and minute select tags Seconds may be added with the option :include_seconds Along with the addition of time information come additional discarding options: :discard_hour, :discard_minute, and :discard_seconds
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time select(object name, method, options = {})
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Returns a set of select tags (one for hour, minute, and optionally second) preselected for accessing a specified time-based attribute (identified by method) on an object assigned to the template (identified by object_name) You can include the seconds with :include_seconds
time_select("post", "sunrise") time_select("post", "start_time", :include_seconds => true)
Helpers
1162 The Individual Date and Time Select Helpers
Sometimes you need just a particular element of a date or time, and Rails obliges you with a comprehensive set of individual date and time select helpers In contrast to the date and time helpers that we just looked at, the following helpers are not bound to an instance variable on the page Instead, they all take a date or time Ruby object as their first parameter (All of these methods have a set of common options, covered in the following subsection)
select date(date = Datetoday, options = {})
Returns a set of select tags (one each for year, month, and day) preselected with the date provided (or the current date) It s possible to explicitly set the order of the tags using the :order option with an array of symbols :year, :month, and :day in the desired order