Rails活动记录，其中方法错误，传递两个参数使用Mongo数据库

时间：2015-11-08 18:47:00

标签： ruby-on-rails ruby ruby-on-rails-4 mongoid

我正在编写一个查询来使用Get Response从数据库中获取值。从响应方面看，一切都很好。但是，我正在努力处理模型中的查询。

@scroll = Scroll.where("name = %?%","#{params[:name]}")

这个查询有两个我知道的参数。但这是查询给定的 Ruby on rails Docs。Here:

中的url

我可以使用Query：

来检索值

@scroll = Scroll.where(name: params[:name])

如果整个单词匹配，则上述查询有效。我希望它接受一个字母并找到包含该字母的单词。
我正在制作一个自动完成搜索框。所以，我需要一个查询，其中包含名称作为用户类型的列值内的字母的行。 我正在使用 MongoDB

发布FullTrace：

mongoid (5.0.1) lib/mongoid/criteria.rb:449:in `where'
(eval):2:in `where'
app/controllers/scrolls_controller.rb:4:in `index'
actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.4) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.4) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal.rb:237:in `block in action'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:76:in `call'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:76:in `dispatch'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:45:in `serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:in `each'
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:821:in `call'
rack (1.6.4) lib/rack/etag.rb:24:in `call'
rack (1.6.4) lib/rack/conditionalget.rb:25:in `call'
rack (1.6.4) lib/rack/head.rb:13:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.4) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
web-console (2.2.1) lib/web_console/middleware.rb:39:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.4) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.4) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.4) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.2.4) 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 (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
railties (4.2.4) lib/rails/engine.rb:518:in `call'
railties (4.2.4) lib/rails/application.rb:165: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'
/home/ashrith/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
/home/ashrith/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
/home/ashrith/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'

2 个答案:

答案 0 :(得分：1)

  

我希望它接受一封信并找到包含该字母的单词   信。

这应该有效：

@scroll = Scroll.where("name LIKE ?","%#{params[:name]}%")

<强>更新 我自己并不熟悉mongodb，但也许这样的事情会起作用：

<your_table>.find({"name": /.*params[:name].*/})

供参考也见： How to query MongoDB with "like"?

答案 1 :(得分：0)

您正在使用Mongoid和MongoDB，因此您无法对'name = ?'使用少量SQL代码段（例如where）。 Mongoid的where只能理解一个Hash，因此抱怨错误的参数数量。同样，您不能在查询中使用%和LIKE，因为SQL和MongoDB不理解SQL。

这有效：

Scroll.where(name: params[:name])

因为你只传递where一个Hash参数。但是这个：

Scroll.where('name = ?', params[:name])

正在尝试将SQL与MongoDB一起使用，但这不起作用。

如果你想与MongoDB进行模式匹配，那么你可以使用正则表达式：

Scroll.where(:name => /#{Regexp.escape(params[:name])}/i)

请注意，我正在使用Regexp.escape正确转义params[:name]中也是正则表达式语法的任何内容，我也在进行不区分大小写的匹配。

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