Rails - Apr 2009 - Convention for setting join model fields when associating

Hi folks

I have this situation:

Region
  has_many :policy_indicator_allocations, :order => "position"
  has_many :policy_indicators, :through => :policy_indicator_allocations

PolicyIndicatorAllocation
  belongs_to :region
  belongs_to :policy_indicator
  belongs_to :year

PolicyIndicator
  has_many :policy_indicator_allocations
  has_many :regions, :through => :policy_indicator_allocations

Year
  has_many :policy_indicator_allocations

So, policy_indicator_allocations are joins between a region and a policy
indicator, for a particular year.

What i''m wondering is this:  when i come to associate a policy
indicator
with a region, i want to do it for a particular year.  What''s the
best/most conventional way to do this?  (assume i have the relevant
models in instance vars)

A not very clever way is this:
  PolicyIndicatorAllocation.create(
    :region_id => @region.id,
    :policy_indicator_id => @policy_indicator.id,
    :year_id => @year.id )

Is there a neater way?

thanks
max
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