Не удается запустить грабли БД: мигрировать, отношение не существует

Question

Я пытаюсь получить работающее приложение, чтобы работать на Linux 10.04 работает на бродячего

Я установил все соответствующие драгоценные камни, установлен PostgreSQL 9.1.9, и когда я пытаюсь бежать rake db:migrate Я получаю

rake aborted! 
PG::Error: ERROR: relation "messages" does not exist 
LINE 5:    WHERE a.attrelid = '"messages"'::regclass 
             ^
:    SELECT a.attname, format_type(a.atttypid, a.atttypmod), 
        pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod 
       FROM pg_attribute a LEFT JOIN pg_attrdef d 
       ON a.attrelid = d.adrelid AND a.attnum = d.adnum 
      WHERE a.attrelid = '"messages"'::regclass 
       AND a.attnum > 0 AND NOT a.attisdropped 
      ORDER BY a.attnum 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1161:in `exec' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1161:in `exec_no_cache' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:660:in `block in exec_query' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/rack-mini-profiler-0.1.26/Ruby/lib/patches/sql_patches.rb:246:in `log_with_miniprofiler' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/newrelic_rpm-3.6.0.83/lib/new_relic/agent/instrumentation/active_record.rb:36:in `block in log_with_newrelic_instrumentation' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/newrelic_rpm-3.6.0.83/lib/new_relic/agent/method_tracer.rb:235:in `trace_execution_scoped' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/newrelic_rpm-3.6.0.83/lib/new_relic/agent/instrumentation/active_record.rb:33:in `log_with_newrelic_instrumentation' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:659:in `exec_query' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1286:in `column_definitions' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:855:in `columns' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/connection_adapters/schema_cache.rb:12:in `block in initialize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/model_schema.rb:228:in `yield' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/model_schema.rb:228:in `default' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/model_schema.rb:228:in `columns' 

/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/model_schema.rb:237:in `columns_hash' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/inheritance.rb:19:in `descends_from_active_record?' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/inheritance.rb:25:in `finder_needs_type_condition?' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/base.rb:455:in `relation' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/scoping/named.rb:37:in `scoped' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activerecord-3.2.13/lib/active_record/querying.rb:9:in `where' 
/home/vagrant/myapp/app/models/message.rb:29:in `<class:Message>' 
/home/vagrant/myapp/app/models/message.rb:25:in `<top (required)>' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:469:in `load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:469:in `block in load_file' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:639:in `new_constants_in' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:468:in `load_file' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:353:in `require_or_load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:502:in `load_missing_constant' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:192:in `block in const_missing' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:190:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:190:in `const_missing' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:230:in `block in constantize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:229:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:229:in `constantize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/core_ext/string/inflections.rb:54:in `constantize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/acts-as-messageable-0.4.8/lib/acts-as-messageable/model.rb:34:in `acts_as_messageable' 
/home/vagrant/myapp/app/models/user.rb:123:in `<class:User>' 
/home/vagrant/myapp/app/models/user.rb:45:in `<top (required)>' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:469:in `load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:469:in `block in load_file' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:639:in `new_constants_in' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:468:in `load_file' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:353:in `require_or_load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:502:in `load_missing_constant' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:192:in `block in const_missing' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:190:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:190:in `const_missing' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:230:in `block in constantize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:229:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/inflector/methods.rb:229:in `constantize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:554:in `get' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:588:in `constantize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise.rb:272:in `get' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/mapping.rb:77:in `to' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/mapping.rb:72:in `modules' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/mapping.rb:89:in `routes' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/mapping.rb:156:in `default_used_route' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/mapping.rb:66:in `initialize' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise.rb:306:in `new' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise.rb:306:in `add_mapping' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/rails/routes.rb:208:in `block in devise_for' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/rails/routes.rb:207:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/devise-2.2.4/lib/devise/rails/routes.rb:207:in `devise_for' 
/home/vagrant/myapp/config/routes.rb:27:in `block in <top (required)>' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:289:in `instance_exec' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:289:in `eval_block' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/actionpack-3.2.13/lib/action_dispatch/routing/route_set.rb:267:in `draw' 
/home/vagrant/myapp/config/routes.rb:1:in `<top (required)>' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:245:in `load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:245:in `block in load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:245:in `load' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:40:in `block in load_paths' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:40:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:40:in `load_paths' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:16:in `reload!' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:26:in `block in updater' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/file_update_checker.rb:78:in `call' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/file_update_checker.rb:78:in `execute' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:27:in `updater' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application/finisher.rb:66:in `block in <module:Finisher>' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `block in run_initializers' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing' 
/home/vagrant/myapp/config/environment.rb:5:in `<top (required)>' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application.rb:103:in `require_environment!' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/application.rb:297:in `block (2 levels) in initialize_tasks' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:246:in `call' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:241:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:205:in `block in invoke_prerequisites' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:203:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:203:in `invoke_prerequisites' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:183:in `block in invoke_with_call_chain' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:101:in `each' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429@global/gems/rake-10.0.4/lib/rake/application.rb:70:in `run' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/bin/ruby_noexec_wrapper:14:in `eval' 
/home/vagrant/.rvm/gems/ruby-1.9.3-p429/bin/ruby_noexec_wrapper:14:in `<main>' 
Tasks: TOP => db:migrate => environment 

rake db:create:all работает говорит мне, что все столы уже были созданы

Я не знаю, если это имеет значение или нет, но я использую разработать 2.2.4 и последнюю acts_as_messageable ,

обратите внимание, что это приложение работает на машине для разработки окон и производства в Heroku .. Я просто хочу, чтобы запустить его на бродягу, а ..

мой database.yml является

common: &common 

     adapter: postgresql 
     enconding: utf8 
     host: localhost 
     username: postgres 
     password: 1234 
     pool: 5 
     timeout: 5000 
    development: 
     <<: *common 
     database: myapp_dev 
     port: 5432 
    test: 
     <<: *common 
     database: myapp_test 

    production: 
     <<: *common 
     database: myapp_prod 

Я подозреваю, что это связано с некоторой конфигурации Postgres, но я не уверен .. не удалось найти решение этой же

при проверке PSQL я получаю это

postgres=# \l 
            List of databases 
    Name  | Owner | Encoding | Collate | Ctype | Access privileges 
-------------+----------+----------+-------------+-------------+----------------------- 
postgres | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | 
template0 | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | =c/postgres   + 
      |   |   |    |    | postgres=CTc/postgres 
template1 | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | =c/postgres   + 
      |   |   |    |    | postgres=CTc/postgres 
myapp_dev | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | 
myapp_prod | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | 
myapp_test | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | 
(6 rows) 

postgres=# \d myapp_dev 
Did not find any relation named "myapp_dev". 

поэтому что-то не так здесь, я думаю .. есть ли решение?

Примечание - это происходит с rake db задач, таких как schema:load, setup ..

В случае, если это необходимо - вот соответствующие строки ошибки, связанные с acts_as_messageable, включая файл миграции

пользователь: линия 120-123

acts_as_messageable :table_name => "messages", 
        :required => :body,    
        :class_name => "Message",  
        :dependent => :destroy   

класс сообщений (строка 25-29)

class Message < ActsAsMessageable::Message 

attr_accessible :sender_open, :reciever_open 
scope :unread_by, lambda{ |user| where("reciever_open = false AND received_messageable_id = ?", user.id)} 
scope :unread, where('reciever_open = false') 

миграции файл - 20121127082447_create_messages_table.rb (его не первым или последним, где-то в середине)

class CreateMessagesTable < ActiveRecord::Migration 
    def self.up 
    create_table :messages do |t| 
     t.string :topic 
     t.text :body 
     t.references :received_messageable, :polymorphic => true 
     t.references :sent_messageable, :polymorphic => true 
     t.boolean :opened, :default => false 
     t.boolean :recipient_delete, :default => false 
     t.boolean :sender_delete, :default => false 
     t.timestamps 

     # ancestry 
     t.string :ancestry 
    end 

    add_index :messages, [:sent_messageable_id, :received_messageable_id], :name => "acts_as_messageable_ids" 
    add_index :messages, :ancestry 
    end 

    def self.down 
    drop_table :messages 
    end 
end 

Answer 1

Routes файла в Rails использует device_for, который загружает модель пользователя, которая, в свою очередь, имеет acts_as_messagable и загружает Message класса.Линия # 29 в Message классе говорит:

scope :unread, where('reciever_open = false')

Метод where является запуская поиск столбца, который терпит неудачу, потому что миграция еще не работает! Попробуйте один из этих двух:

Изменить это:

scope :unread, where(:reciever_open => false)

Или, если это также вызывает поиск столбца, а затем сказать:

scope :unread, lambda { where('reciever_open = false') }

Answer 2

Просто пытался проверить на очевидное здесь, но вы пробовали работает rake db:drop? Всякий раз, когда я вношу изменения в свои миграции, мне нужно отбросить все мои таблицы БД, прежде чем пытаться их создать и перенести.

Так полная операция будет rake db:drop db:create db:migrate

О, и вы также можете попробовать указать среду (я иногда нужно делать это на тестовой среде), например rake RAILS_ENV=test db:drop db:create db:migrate