运行后Heroku运行rake db出现错误：migrate

Question

我已经跑了“heroku pg：reset DATABASE”。但是，我仍然有这个错误。

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Running `rake db:migrate` attached to terminal... up, run.8257 
== AddPasswordDigestToUsers: migrating ======================================= 
-- add_column(:users, :password_digest, :string) 
rake aborted! 
An error has occurred, this and all later migrations canceled: 

PG::Error: ERROR: relation "users" does not exist 
: ALTER TABLE "users" ADD COLUMN "password_digest" character varying(255)/app/ve 
ndor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connection_adap 
ters/postgresql/database_statements.rb:128:in `exec' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/postgresql/database_statements.rb:128:in `block in execute' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract_adapter.rb:425:in `block in log' 
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-4.0.0/lib/active_support/notifi 
cations/instrumenter.rb:20:in `instrument' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract_adapter.rb:420:in `log' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/postgresql/database_statements.rb:127:in `execute' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract/schema_statements.rb:360:in `add_column' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/postgresql/schema_statements.rb:379:in `add_column' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:625:in `block in method_missing' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:597:in `block in say_with_time' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:597:in `say_with_time' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:617:in `method_missing' 
/app/db/migrate/20130822145844_add_password_digest_to_users.rb:3:in `change' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:571:in `exec_migration' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:555:in `block (2 levels) in migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:554:in `block in migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract/connection_pool.rb:294:in `with_connection' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:553:in `migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:709:in `migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:959:in `block in execute_migration_in_transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:1005:in `block in ddl_transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract/database_statements.rb:202:in `block in transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract/database_statements.rb:210:in `within_new_transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/connecti 
on_adapters/abstract/database_statements.rb:202:in `transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/transact 
ions.rb:209:in `transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:1005:in `ddl_transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:958:in `execute_migration_in_transaction' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:920:in `block in migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:916:in `each' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:916:in `migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:764:in `up' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/migratio 
n.rb:742:in `migrate' 
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-4.0.0/lib/active_record/railties 
/databases.rake:42:in `block (2 levels) in <top (required)>' 
Tasks: TOP => db:migrate 
(See full trace by running task with --trace) 

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什么建议吗？

Answer 1

很可能它尝试在创建用户表之前运行向用户表中添加密码摘要的迁移。您可以尝试先创建数据库或尝试重置它。你可以通过做rake db创建db：create