これは私のPlan.rbがどのように見えるかです：
class Plan < ActiveRecord::Base
has_many :users
has_friendly_id :plan, :use_slug => true
end
User.rb
class User < ActiveRecord::Base
#There is other stuff in here, but I stripped it out for brevity purposes.
has_and_belongs_to_many :projects
has_many :stages
has_many :uploads
has_many :comments
has_many :assignments
has_many :roles, :through => :assignments
belongs_to :plan
end
これは私が受け取っているエラーメッセージです：
'ruby-1.9.2-p0 > Plan.create(:name => "First_Test", :storage => "100")
NoMethodError: undefined method `plan' for #<Plan:0x00000102b8a2d8>
/gemms/ruby-1.9.2-p0/gems/activemodel-3.0.3/lib/active_model/attribute_methods.rb:364:in `method_missing'
/gemms/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/attribute_methods.rb:46:in `method_missing'
/gems/ruby-1.9.2-p0/gems/friendly_id-3.2.0/lib/friendly_id/slugged.rb:82:in `slug_text'
/gems/ruby-1.9.2-p0/gems/friendly_id-3.2.0/lib/friendly_id/active_record_adapter/slugged_model.rb:49:in `build_a_slug'
/gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:419:in `_run_save_callbacks'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/callbacks.rb:277:in `create_or_update'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/persistence.rb:39:in `save'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/validations.rb:43:in `save'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/attribute_methods/dirty.rb:21:in `save'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:237:in `block (2 levels) in save'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:289:in `block in with_transaction_returning_status'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:204:in `transaction'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:287:in `with_transaction_returning_status'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:237:in `block in save'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:248:in `rollback_active_record_state!'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:236:in `save'
/gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/base.rb:498:in `create'
from (irb):3
/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'
/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'
/gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
ここで何が間違っているのかわかりませんが、新しい「計画」を作成することはできません。