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112 lines
3.9 KiB
Ruby
112 lines
3.9 KiB
Ruby
require 'active_support/core_ext/class/attribute'
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module ActionController
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# The \Rails framework provides a large number of helpers for working with assets, dates, forms,
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# numbers and model objects, to name a few. These helpers are available to all templates
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# by default.
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#
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# In addition to using the standard template helpers provided, creating custom helpers to
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# extract complicated logic or reusable functionality is strongly encouraged. By default, each controller
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# will include all helpers.
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#
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# In previous versions of \Rails the controller will include a helper whose
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# name matches that of the controller, e.g., <tt>MyController</tt> will automatically
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# include <tt>MyHelper</tt>. To return old behavior set +config.action_controller.include_all_helpers+ to +false+.
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#
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# Additional helpers can be specified using the +helper+ class method in ActionController::Base or any
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# controller which inherits from it.
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#
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# ==== Examples
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# The +to_s+ method from the \Time class can be wrapped in a helper method to display a custom message if
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# a \Time object is blank:
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#
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# module FormattedTimeHelper
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# def format_time(time, format=:long, blank_message=" ")
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# time.blank? ? blank_message : time.to_s(format)
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# end
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# end
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#
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# FormattedTimeHelper can now be included in a controller, using the +helper+ class method:
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#
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# class EventsController < ActionController::Base
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# helper FormattedTimeHelper
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# def index
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# @events = Event.all
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# end
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# end
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#
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# Then, in any view rendered by <tt>EventController</tt>, the <tt>format_time</tt> method can be called:
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#
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# <% @events.each do |event| -%>
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# <p>
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# <%= format_time(event.time, :short, "N/A") %> | <%= event.name %>
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# </p>
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# <% end -%>
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#
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# Finally, assuming we have two event instances, one which has a time and one which does not,
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# the output might look like this:
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#
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# 23 Aug 11:30 | Carolina Railhawks Soccer Match
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# N/A | Carolina Railhaws Training Workshop
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#
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module Helpers
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extend ActiveSupport::Concern
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include AbstractController::Helpers
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included do
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class_attribute :helpers_path, :include_all_helpers
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self.helpers_path ||= []
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self.include_all_helpers = true
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end
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module ClassMethods
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# Declares helper accessors for controller attributes. For example, the
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# following adds new +name+ and <tt>name=</tt> instance methods to a
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# controller and makes them available to the view:
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# attr_accessor :name
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# helper_attr :name
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#
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# ==== Parameters
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# * <tt>attrs</tt> - Names of attributes to be converted into helpers.
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def helper_attr(*attrs)
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attrs.flatten.each { |attr| helper_method(attr, "#{attr}=") }
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end
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# Provides a proxy to access helpers methods from outside the view.
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def helpers
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@helper_proxy ||= ActionView::Base.new.extend(_helpers)
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end
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# Overwrite modules_for_helpers to accept :all as argument, which loads
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# all helpers in helpers_path.
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#
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# ==== Parameters
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# * <tt>args</tt> - A list of helpers
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#
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# ==== Returns
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# * <tt>array</tt> - A normalized list of modules for the list of helpers provided.
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def modules_for_helpers(args)
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args += all_application_helpers if args.delete(:all)
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super(args)
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end
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def all_helpers_from_path(path)
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helpers = []
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Array(path).each do |_path|
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extract = /^#{Regexp.quote(_path.to_s)}\/?(.*)_helper.rb$/
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helpers += Dir["#{_path}/**/*_helper.rb"].map { |file| file.sub(extract, '\1') }
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end
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helpers.sort!
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helpers.uniq!
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helpers
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end
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private
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# Extract helper names from files in <tt>app/helpers/**/*_helper.rb</tt>
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def all_application_helpers
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all_helpers_from_path(helpers_path)
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end
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end
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end
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end
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