profile_list_block.rb
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class ProfileListBlock < Block
settings_items :limit, :default => 6
def self.description
_('A block that displays random profiles')
end
# Override this method to make the block list specific types of profiles
# instead of anyone.
#
# In this class this method just returns <tt>Profile</tt> (the class). In
# subclasses you could return <tt>Person</tt>, for instance, if you only want
# to list people, or <tt>Organization</tt>, if you want organizations only.
#
# You don't need to return only classes. You can for instance return an
# association array from a has_many ActiveRecord association, for example.
# Actually the only requirement for the object returned by this method is to
# have a <tt>find</tt> method that accepts the same interface as the
# ActiveRecord::Base's find method .
def profile_finder
@profile_finder ||= ProfileListBlock::Finder.new(self)
end
# Default finder. Finds the most recently added profiles.
class Finder
def initialize(block)
@block = block
end
attr_reader :block
def find
id_list = self.ids
result = []
[block.limit, id_list.size].min.times do
i = pick_random(id_list.size)
result << Profile.find(id_list[i])
id_list.delete_at(i)
end
result
end
def pick_random(top)
rand(top)
end
def ids
Profile.connection.select_all('select id from profiles').map { |entry| entry['id'].to_i }
end
end
def profiles
profile_finder.find
end
# the title of the block. Probably will be overriden in subclasses.
def title
_('People and Groups')
end
def help
_('Clicking on the people or groups will take you to their home page.')
end
def content
profiles = self.profiles
title = self.title
nl = "\n"
lambda do
list = profiles.map {|item| content_tag( 'li', profile_image_link(item) ) }.join("\n ")
if list.empty?
list = '<div class="common-profile-list-block-none">'+ _('None') +'</div>'
else
list = content_tag( 'ul', nl +' '+ list + nl )
end
'<div class="common-profile-list-block">' +
nl + block_title(title) + nl + list + nl +
'</div>'
end
end
end