Dear All,
Do I need to assign different key for each sub-model when I use single table
inheritance of datamapper?
class Action
include DataMapper::Resource
property :type, Discriminator, :key => true
property :comment, String, :length => 140
property :created_at, DateTime
belongs_to :loan, :key => true
end
class Agreement < Action; end
I got a error as follow.
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/adapters/dm-do-adapter.rb:70:in
`execute_non_query': duplicate column name: type (DataObjects::SyntaxError)
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/adapters/dm-do-adapter.rb:70:in
`block (2 levels) in upgrade_model_storage'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/adapters/dm-do-adapter.rb:64:in
`map'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/adapters/dm-do-adapter.rb:64:in
`block in upgrade_model_storage'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-do-adapter-1.0.2/lib/dm-do-adapter/adapter.rb:260:in
`with_connection'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/adapters/dm-do-adapter.rb:63:in
`upgrade_model_storage'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/auto_migration.rb:71:in
`upgrade_model_storage'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/auto_migration.rb:143:in
`auto_upgrade!'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/auto_migration.rb:145:in
`auto_upgrade!'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/auto_migration.rb:45:in
`block in repository_execute'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:69:in
`block (2 levels) in each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:68:in
`block in each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:67:in
`each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:67:in
`each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:69:in
`block in each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:67:in
`each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-core-1.0.2/lib/dm-core/support/descendant_set.rb:67:in
`each'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/auto_migration.rb:44:in
`repository_execute'
from
/Users/siegfried/.rvm/gems/ruby-1.9.2-p0/gems/dm-migrations-1.0.2/lib/dm-migrations/auto_migration.rb:27:in
`auto_upgrade!'
from models.rb:67:in `<module:Models>'
from models.rb:15:in `<module:EIOU>'
from models.rb:9:in `<main>'
Best regards,
Zhi-Qiang Lei
[email protected]
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