[Rails] using find with multiple objects in active record

[Sutee Dee]

Hi,

I am trying to learn to use RoR by making a simple social networking 
example. Given a user id, I am trying to make a query that finds all of 
the group that user belongs to but also rank the groups by one of the 
groups' parameter like group.size. Pretend group.size is a number from 
1-10 and is precalculated. Can I do this is one query? Here are the 
relationships I set up:

class User < ActiveRecord::Base
	has_and_belongs_to_many :groups
end

class Groupship < ActiveRecord::Base
	set_table_name "users_groups"
	belongs_to :recipes
	belongs_to :tags
end

class Group < ActiveRecord::Base
	has_and_belongs_to_many :users
end

Thanks!

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