I have been messing around with Facebook apps recently and I found a couple of articles to be very helpful:
Tutorial On Developing A Facebook Platform Application With Ruby on Rails
Continuing Facebook Applications With Ruby on Rails
I especially liked the Mime type for fbml that is from the last post, simply add:
Mime::Type.register 'text/html', :fbml
ActionController::MimeResponds::Responder::DEFAULT_BLOCKS[:fbml] = %(lambda { render :action => "\#{action_name}_fbml" })
to environment.rb and off you go.
The first two were very helpful in getting things going but seemed to make some really simple things very complicated. One was invites. Facebook supply a very nice fbml helper for creating invite pages the fb:multi-friend-selector.
This can be used like so:
<fb:request-form action="http://apps.facebook.com/myapp" method="POST" type="MyApp" content="<%= render :partial => 'invite_fbml' %>">
<fb:multi-friend-selector actiontext="Select the friends you want to install MyApp" exclude_ids="<%= @friends_with_app %>"/>
</fb:request-form>
Where the invite partial looks like:
<fb:name uid='<%= @current_fb_user.facebook_uid %>' firstnameonly='true' shownetwork='false'/> wants you to install MyApp <fb:req-choice url='http://www.facebook.com/add.php?api_key=APIKEY' label='Install MyApp'/>
and the controller method goes a bit like:
def index
fql = "SELECT uid, name FROM user WHERE uid IN" <<
"(SELECT uid2 FROM friend WHERE uid1 = #{@current_fb_user.facebook_uid}) AND has_added_app = 1"
friends = fbsession.fql_query :query => fql
ids = []
(friends/:user).each do|u|
ids << (u/:uid).inner_html
end
@friends_with_app = ids.join(',')
respond_to do |format|
format.html # index.rhtml
format.fbml # index_fbml.rhtml - facebook
end
end
Put it all together and you get something like:
Ta da!! You can also provide a post invite hook which will be the action provided to the facebook form element.
Now go and install Nothing to see it in action.
5 Comments
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