Put this on StackOverflow<http://stackoverflow.com/questions/15044787/ruby-datamapper-one-to-many-association-wont-save-using-parent-key>, but figured I would ask here as well.
I have setup the following model with specific parent and child keys: class Province include DataMapper::Resource property :name_short, String, key: true, length: 2, unique: true property :name_long, String, length: 1..50 has n, :municipalities, 'Municipality', parent_key: [:name_short], child_key: [:province] end class Municipality include DataMapper::Resource property :province, String, key: true, length: 2 property :name, String, key: true, length: 1..40 property :lat, Float property :long, Float property :current_population, Integer belongs_to :province, 'Province', parent_key: [:name_short], child_key: [:province] end I then create the associated record with: province = Province.get('BC') municipality = province.municipalities.new( name: '100 mile house', lat: 51.23131, long: 121.65489, current_population: 0) And finally execute `municipality.save`, which fails because the record it is trying to save (see below) is trying to use the entire *Province object*as the key, *instead of just the :name_short* field. #<Municipality @province=#<Province @name_short="BC" @name_long="British Columbia"> @name="100 mile house" @lat=51.64300975 @long=121.295022 @current_population=0> The `save` error returned is a validation type error: ["Province must be at most 2 characters long", "Province must be of type String"] As well, after trying a few thing, adding the following `to_s` method to the `Province` class, managed to get rid of the `"Province must be at most 2 characters long"` error - but still get the String error: def to_s @short_name end I tried removing the parent/child_key: options, to let DM build its own association key fields, but that didn't work either.jjj I must admit, I'm at a loss, and have started taking a look how to do this with Sequel. Since I've spent the last couple weeks invested in trying to get DM working with my projects, I'd rather not see that time go to was and would appreciate some help. P.s. Is DataMapper still being developed and supported somewhere? It really seems hard to find any sort of help, except for the rare blog entry or occasional answer on StakOverflow. -- You received this message because you are subscribed to the Google Groups "DataMapper" group. To unsubscribe from this group and stop receiving emails from it, send an email to datamapper+unsubscr...@googlegroups.com. To post to this group, send email to datamapper@googlegroups.com. Visit this group at http://groups.google.com/group/datamapper?hl=en. For more options, visit https://groups.google.com/groups/opt_out.