Ruby on rails 我的用户表在开发中丢失，我可以'；我不知道发生了什么事 我在Rails教程上工作，我的用户表在练习的中间不断丢失，尽管我没有碰过它。就像它刚刚消失一样

我尝试过重置数据库、rake db:prepare等等，但仍然没有成功。任何想法都会很棒，这让我发疯

这是错误

ActiveRecord::StatementInvalid in UsersController#new
Could not find table 'users'

Extracted source (around line #511):

        def table_structure(table_name)
          structure = exec_query("PRAGMA table_info(#{quote_table_name(table_name)})", 'SCHEMA').to_hash
          raise(ActiveRecord::StatementInvalid, "Could not find table '#{table_name}'") if structure.empty?
          structure
        end

这是完整的追踪

Started GET "/apple-touch-icon.png" for 71.125.40.81 at 2016-02-06 21:28:53 +0000

ActionController::RoutingError (No route matches [GET] "/apple-touch-icon.png"):
  web-console (2.0.0.beta3) lib/action_dispatch/debug_exceptions.rb:22:in `middleware_call'
  web-console (2.0.0.beta3) lib/action_dispatch/debug_exceptions.rb:13:in `call'
  actionpack (4.2.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.2) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.2) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.2.2) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.2.2) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.2.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.4) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  rack (1.6.4) lib/rack/lock.rb:17:in `call'
  actionpack (4.2.2) lib/action_dispatch/middleware/static.rb:113:in `call'
  rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
  railties (4.2.2) lib/rails/engine.rb:518:in `call'
  railties (4.2.2) lib/rails/application.rb:164:in `call'
  rack (1.6.4) lib/rack/lock.rb:17:in `call'
  rack (1.6.4) lib/rack/content_length.rb:15:in `call'
  rack (1.6.4) lib/rack/handler/webrick.rb:88:in `service'
  /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
  /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
  /usr/local/rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'


  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_trace.html.erb (2.9ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/routing_error.html.erb within rescues/layout (225.8ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:28:58 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.3ms)
  Rendered layouts/_shim.html.erb (0.6ms)
  Rendered layouts/_header.html.erb (1.2ms)
  Rendered layouts/_footer.html.erb (0.6ms)
Completed 200 OK in 231ms (Views: 230.1ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:28:59 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (2.7ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (0.5ms)
  Rendered layouts/_footer.html.erb (0.2ms)
Completed 200 OK in 258ms (Views: 256.8ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:28:59 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.4ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (0.6ms)
  Rendered layouts/_footer.html.erb (0.3ms)
Completed 200 OK in 360ms (Views: 359.1ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:29:00 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (2.3ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (0.4ms)
  Rendered layouts/_footer.html.erb (0.3ms)
Completed 200 OK in 375ms (Views: 373.6ms | ActiveRecord: 0.0ms)


Started GET "/help" for 71.125.40.81 at 2016-02-06 21:29:00 +0000
Processing by StaticPagesController#help as HTML
  Rendered static_pages/help.html.erb within layouts/application (1.1ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (0.6ms)
  Rendered layouts/_footer.html.erb (0.3ms)
Completed 200 OK in 403ms (Views: 401.9ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:29:01 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (27.1ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (0.6ms)
  Rendered layouts/_footer.html.erb (0.3ms)
Completed 200 OK in 284ms (Views: 283.4ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:29:01 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.7ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (0.6ms)
  Rendered layouts/_footer.html.erb (0.3ms)
Completed 200 OK in 346ms (Views: 345.2ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:29:18 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.4ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  User Load (1.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
  Rendered layouts/_header.html.erb (41.0ms)
Completed 500 Internal Server Error in 263ms (ActiveRecord: 1.3ms)

ActiveRecord::StatementInvalid (SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1):
  app/helpers/sessions_helper.rb:10:in `current_user'
  app/helpers/sessions_helper.rb:15:in `logged_in?'
  app/views/layouts/_header.html.erb:8:in `_app_views_layouts__header_html_erb___2832195305809045204_70241069995700'
  app/views/layouts/application.html.erb:12:in `_app_views_layouts_application_html_erb__577028620516446828_70241076070000'


  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_source.erb (11.8ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_trace.html.erb (6.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_request_and_response.html.erb (2.2ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_web_console.html.erb (1.6ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/diagnostics.html.erb within rescues/layout (411.6ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:31:53 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (5.5ms)
  Rendered layouts/_shim.html.erb (0.2ms)
  User Load (3.6ms)  SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
  Rendered layouts/_header.html.erb (154.0ms)
Completed 500 Internal Server Error in 573ms (ActiveRecord: 3.6ms)

ActiveRecord::StatementInvalid (SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1):
  app/helpers/sessions_helper.rb:10:in `current_user'
  app/helpers/sessions_helper.rb:15:in `logged_in?'
  app/views/layouts/_header.html.erb:8:in `_app_views_layouts__header_html_erb___2832195305809045204_70240806258820'
  app/views/layouts/application.html.erb:12:in `_app_views_layouts_application_html_erb__577028620516446828_70241076070000'


  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_source.erb (51.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_trace.html.erb (5.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_request_and_response.html.erb (2.0ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_web_console.html.erb (1.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/diagnostics.html.erb within rescues/layout (569.4ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:32:09 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (5.0ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  Rendered layouts/_header.html.erb (1.5ms)
  Rendered layouts/_footer.html.erb (0.4ms)
Completed 200 OK in 182ms (Views: 180.1ms | ActiveRecord: 0.0ms)


Started GET "/assets/custom.self-c38ac96984bc7e1251850a06b64c12df6b20e1117426706f1ca1b4cc7ad1586a.css?body=1" for 71.125.40.81 at 2016-02-06 21:32:09 +0000


Started GET "/assets/jquery_ujs.self-8e98a7a072a6cee1372d19fff9ff3e6aa1e39a37d89d6f06861637d061113ee7.js?body=1" for 71.125.40.81 at 2016-02-06 21:32:09 +0000


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Started GET "/assets/static_pages.self-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css?body=1" for 71.125.40.81 at 2016-02-06 21:32:09 +0000


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Started GET "/assets/static_pages.self-877aef30ae1b040ab8a3aba4e3e309a11d7f2612f44dde450b5c157aa5f95c05.js?body=1" for 71.125.40.81 at 2016-02-06 21:32:09 +0000


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Started GET "/assets/users.self-877aef30ae1b040ab8a3aba4e3e309a11d7f2612f44dde450b5c157aa5f95c05.js?body=1" for 71.125.40.81 at 2016-02-06 21:32:09 +0000


Started GET "/assets/sessions.self-877aef30ae1b040ab8a3aba4e3e309a11d7f2612f44dde450b5c157aa5f95c05.js?body=1" for 71.125.40.81 at 2016-02-06 21:32:09 +0000


Started GET "/" for 71.125.40.81 at 2016-02-06 21:32:18 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (5.7ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  User Load (1.5ms)  SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
  Rendered layouts/_header.html.erb (12.3ms)
Completed 500 Internal Server Error in 161ms (ActiveRecord: 1.5ms)

ActiveRecord::StatementInvalid (SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1):
  app/helpers/sessions_helper.rb:10:in `current_user'
  app/helpers/sessions_helper.rb:15:in `logged_in?'
  app/views/layouts/_header.html.erb:8:in `_app_views_layouts__header_html_erb___2832195305809045204_70240802157820'
  app/views/layouts/application.html.erb:12:in `_app_views_layouts_application_html_erb__577028620516446828_70241076070000'


  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_source.erb (25.0ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_trace.html.erb (7.4ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_request_and_response.html.erb (1.9ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_web_console.html.erb (1.2ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/diagnostics.html.erb within rescues/layout (168.1ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:33:42 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.3ms)
  Rendered layouts/_shim.html.erb (0.1ms)
  User Load (1.4ms)  SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1
  Rendered layouts/_header.html.erb (22.5ms)
Completed 500 Internal Server Error in 241ms (ActiveRecord: 1.4ms)

ActiveRecord::StatementInvalid (SQLite3::SQLException: no such table: users: SELECT  "users".* FROM "users" WHERE "users"."id" IS NULL LIMIT 1):
  app/helpers/sessions_helper.rb:10:in `current_user'
  app/helpers/sessions_helper.rb:15:in `logged_in?'
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  app/views/layouts/application.html.erb:12:in `_app_views_layouts_application_html_erb__577028620516446828_70241076070000'


  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_source.erb (34.0ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_trace.html.erb (9.7ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_request_and_response.html.erb (2.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/_web_console.html.erb (1.4ms)
  Rendered /usr/local/rvm/gems/ruby-2.2.1/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/diagnostics.html.erb within rescues/layout (176.9ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:39:03 +0000
  ActiveRecord::SchemaMigration Load (0.3ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (24.2ms)
  Rendered layouts/_shim.html.erb (0.8ms)
  Rendered layouts/_header.html.erb (1.8ms)
  Rendered layouts/_footer.html.erb (1.2ms)
Completed 200 OK in 267ms (Views: 265.0ms | ActiveRecord: 0.0ms)


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Started GET "/assets/turbolinks.self-c846e670826600e8c91b1a5ada3e6547110d996cd6ff24cde55024f7a135a1b4.js?body=1" for 71.125.40.81 at 2016-02-06 21:39:04 +0000


Started GET "/" for 71.125.40.81 at 2016-02-06 21:39:05 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.6ms)
  Rendered layouts/_shim.html.erb (0.6ms)
  Rendered layouts/_header.html.erb (0.7ms)
  Rendered layouts/_footer.html.erb (0.6ms)
Completed 200 OK in 142ms (Views: 140.8ms | ActiveRecord: 0.0ms)


Started GET "/" for 71.125.40.81 at 2016-02-06 21:40:02 +0000
Processing by StaticPagesController#home as HTML
  Rendered static_pages/home.html.erb within layouts/application (3.6ms)
  Rendered layouts/_shim.html.erb (0.1ms)
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  Rendered layouts/_footer.html.erb (0.2ms)
Completed 200 OK in 106ms (Views: 104.2ms | ActiveRecord: 0.0ms)


Started GET "/assets/custom.self-c38ac96984bc7e1251850a06b64c12df6b20e1117426706f1ca1b4cc7ad1586a.css?body=1" for 71.125.40.81 at 2016-02-06 21:40:02 +0000


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Started GET "/assets/sessions.self-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css?body=1" for 71.125.40.81 at 2016-02-06 21:40:02 +0000


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ActiveRecord::StatementInvalid (Could not find table 'users'):
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ActiveRecord::StatementInvalid (Could not find table 'users'):
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ActiveRecord::StatementInvalid (Could not find table 'users'):
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ActiveRecord::StatementInvalid (Could not find table 'users'):
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---

假设这里没有人可以访问教程，并用这种方式解释您的问题。您有创建表的迁移吗？您是否复制粘贴了任何关于将用户表删除到任何其他迁移的代码？是否每次运行测试时都从头开始创建db？您的测试设置是什么？@MaxWilliams我相信我的迁移是好的，但我不确定。基本上我只是在工作，然后用户表的一切都坏了。所以我需要弄清楚如何重新设置它，让它重新工作。我是rails新手，在这一点上我非常迷茫。听起来你要么放弃了整个db并重新创建了它，要么是意外地放弃了users表。无论哪种方式，请再次运行迁移。在运行rake db:migrate之后，迁移是否有效？运行rake-db:drop-db:create-db:migrate和db:seed（如果您有种子）@ruby_就是这样的新手！谢谢，谢谢！！！