我有以下迁移:Rails的迁移提供了错误
def self.up
add_column :project_statuses, :system_sequence, :integer, :default => 0, :null => false
ProjectStatus.create :name => 'Declined', :sequence => 35, :system_sequence => 110
...
end
但是当我做了rake db:create
,rake db:migrate
,我得到以下错误:
== NewProjectStatuses: migrating =============================================
-- add_column(:project_statuses, :system_sequence, :integer, {:default=>0, :null=>false})
-> 0.0029s
rake aborted!
An error has occurred, this and all later migrations canceled:
unknown attribute: system_sequence
/Users/ttt/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activerecord-3.1.1/lib/active_record/base.rb:1753:in `block in assign_attributes'
/Users/ttt/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activerecord-3.1.1/lib/active_record/base.rb:1747:in `each'
/Users/ttt/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activerecord-3.1.1/lib/active_record/base.rb:1747:in `assign_attributes'
/Users/ttt/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activerecord-3.1.1/lib/active_record/base.rb:1567:in `initialize'
/Users/ttt/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activerecord-3.1.1/lib/active_record/base.rb:508:in `new'
/Users/ttt/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activerecord-3.1.1/lib/active_record/base.rb:508:in `create'
/[working dir]/db/migrate/20100816100139_new_project_statuses.rb:7:in `up'
错误的行号是指Project.create :name => ...
行。
看起来好像add_column
行完全不运行,即使输出表示它正在运行。
运行一个rake db:migrate
再次贯穿迁移很好。
这是为什么?
是的,这正是问题所在。谢谢!我可能会将这些违规行移动到seeds.rb文件中,但是之后我需要重构迁移行,因为它需要这些创建行才能工作。 – zlog
够酷。祝你好运。 – jefflunt