See the following code:
class A
include DataMapper::Resource
property :id, Serial
is :tree
end
A.auto_migrate!
A.new.save!
The last line will raise exception:
/usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-core/
adapters/data_objects_adapter.rb:162:in `execute_non_query': Field
'parent_id' doesn't have a default value (DataObjects::SQLError)
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/adapters/data_objects_adapter.rb:162:in `execute'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/adapters/data_objects_adapter.rb:266:in `with_connection'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/adapters/data_objects_adapter.rb:160:in `execute'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/adapters/data_objects_adapter.rb:58:in `create'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/adapters/data_objects_adapter.rb:31:in `each'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/adapters/data_objects_adapter.rb:31:in `create'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/repository.rb:125:in `create'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/resource.rb:808:in `_create'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/resource.rb:556:in `save_self'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-validations-0.10.1/lib/
dm-validations.rb:55:in `save_self'
from /usr/local/ruby/lib/ruby/gems/1.8/gems/dm-core-0.10.1/lib/dm-
core/resource.rb:354:in `save!'
This is because auto_migration generate `parent_id` column with NOT
NULL option, and when I add a root node(parent_id is null), database
won't pass.
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