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SpatialAssociations =================== SpatialAssociations provides helper methods for ActiveRecord::Base that enable spatially constrained associations. A Spatial Association is one where the coupling between models is determined by the result of a geometric function, rather than a relational key-based linking. This plugin assumes that you are using PostGIS, and that your geometric columns are all named 'geometry'. Helpers Available ================= is_enclosed_by :model i.e. a city is_enclosed_by a state. encloses :models i.e. a state encloses cities. Example ======= Say I have two spatial enabled models, City and State. Add the helpers to the appropriate models: class City < ActiveRecord::Base is_enclosed_by :state end class State < ActiveRecord::Base encloses :cities end I can now use these associations as follows: @someCitysState = @someCityObject.state # => Returns a state object that spatially encloses the receiving city. @someStatesCities = @someStateObject.cities # => Returns an array of City objects which are spatially enclosed by the receiving state. Copyright (c) 2008 Bradley Spaulding, released under the MIT license