My solution:
class Group < ActiveRecord::Base
...
def to_json(options = {})
methods = [:somethings] # Always include somethings
methods << :group_members if options[:include_group_members]
super({:methods => methods}.merge(options))
end
end
...and in the one action in the single controller where I want to show
GroupMembers, I call to_json directly on the larger hash that contains
my array of Groups (among other things): render :json =>
that_hash.to_json(:include_group_members => true)
It turns out that when to_json recurses into nested elements, it
passes the options hash down the chain, so in my case it trickles down
to my Group#to_json method.
>> class Foo
>> def to_json(options = {})
>> puts "f was #{options[:f]}"
>> end
>> end
=> nil
>> {:foo => Foo.new}.to_json(:f => 'biff')
f was biff
=> "{\"f1\":}"
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