Created
June 5, 2009 04:54
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require 'rubygems' | |
require 'dm-core' #0.9.11 | |
DataMapper.setup(:default, 'sqlite3::memory:') | |
class Location | |
include DataMapper::Resource | |
property :id, Serial | |
property :city, String | |
end | |
class Distance | |
include DataMapper::Resource | |
property :id, Serial | |
property :amount, Integer | |
belongs_to :origin, :class_name => "Location", :child_key => [:origin_location_id] | |
belongs_to :destination, :class_name => "Location", :child_key => [:destination_location_id] | |
end | |
DataMapper.auto_migrate! | |
Location.create(:city => "Houston") | |
Location.create(:city => "Chicago") | |
Distance.create(:amount => 1000, :origin_location_id => 1, :destination_location_id => 2) | |
Distance.first("origin.city" => "Houston", "destination.city" => "Chicago") |
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/Library/Ruby/Gems/1.8/gems/dm-core-0.9.11/lib/dm-core/adapters/data_objects_adapter.rb:66:in `execute_reader': ambiguous column name: distances.id (Sqlite3Error) | |
Query: SELECT "distances"."id", "distances"."amount", "distances"."origin_location_id", | |
"distances"."destination_location_id" FROM "distances" INNER JOIN "locations" ON ("locations"."id" = | |
"distances"."destination_location_id") INNER JOIN "distances" ON ("locations"."id" = | |
"distances"."origin_location_id") WHERE ("locations"."city" = 'Chicago') AND ("locations"."city" = 'Houston') | |
ORDER BY "distances"."id" LIMIT 1 | |
from /Library/Ruby/Gems/1.8/gems/dm-core-0.9.11/lib/dm-core/adapters/data_objects_adapter.rb:66:in `read_one' | |
from /Library/Ruby/Gems/1.8/gems/dm-core-0.9.11/lib/dm-core/adapters/data_objects_adapter.rb:173:in `with_connection' | |
from /Library/Ruby/Gems/1.8/gems/dm-core-0.9.11/lib/dm-core/adapters/data_objects_adapter.rb:61:in `read_one' | |
from /Library/Ruby/Gems/1.8/gems/dm-core-0.9.11/lib/dm-core/repository.rb:72:in `read_one' | |
from /Library/Ruby/Gems/1.8/gems/dm-core-0.9.11/lib/dm-core/model.rb:267:in `first' | |
from finder.rb:23 |
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