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.
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