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module ContentHelper
# Returns the published_at attribute of a page if it is not nil, otherwise
# it returns the auto-filled value of the created_at attribute
def date_for_page page
page.published_at.to_s(:db) rescue page.created_at.to_s(:db)
end
def author_for_page page
page.user ? page.user.login : "Unknown author"
end
def page_title
if @page.title && @page.title != ""
"CCC | #{@page.title}"
else
"CCC | Chaos Computer Club"
end
end
# This method is an output filter for templates. It accepts any kind of text
# and checks for an <aggregate /> tag within it. If such a tag is found, its
# attributes are parsed and converted into parameters for the
# render_collection method. The <aggregate /> tag will then be replaced
# entirely with the output of the render_collection method.
#
# Syntax of the <aggregate /> tag:
#
# <aggregate
# flags="update, pressemitteilung"
# limit="20"
# order_by="published_at"
# order_direction="DESC"
# />
def aggregate? content
options = {}
begin
if content =~ /<aggregate([^<>]*)>/
tag = $~.to_s
matched_data = $1.scan(/\w+\=\"[a-zA-Z\s\/_\d,]*\"/)
matched_data.each do |data|
splitted_data = data.split("=")
options[splitted_data[0].to_sym] = splitted_data[1].gsub(/\"/, "")
end
options[:partial] = select_partial( options[:partial] )
content.sub(tag, render_collection(options))
else
content
end
rescue
content
end
end
# Takes the parameters from the aggregate? method and renders the collection
# from Page.aggregate(options) with a given partial
def render_collection options
render(
:partial => options[:partial],
:collection => Page.aggregate(options),
:as => :page
)
end
private
# Either return a custom partial path if it exsits or default to the standard
# partial
def select_partial partial
if partial && partial_exists?( partial )
return "custom/partials/#{partial}"
else
return 'custom/partials/article'
end
end
# Check if a custom partial exists in the proper location
def partial_exists? partial
File.exist?(
File.join(
RAILS_ROOT, 'app', 'views', 'custom', 'partials', "_#{partial}.html.erb"
)
)
end
end
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