Rails活動記錄哪裏方法錯誤與傳遞兩個參數與Mongo數據庫

我正在寫一個查詢以獲取來自數據庫的值使用Get Response.Everything是Okfrom響應side.But，我掙扎在模型中的查詢。Rails活動記錄哪裏方法錯誤與傳遞兩個參數與Mongo數據庫

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

這個查詢有兩個參數。我知道這是查詢的網址在Ruby on Rails的文檔中給出。 Here:

我可以使用查詢檢索值：

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

這上面的查詢工作，如果整個單詞Matches.I希望它接受了一封信，發現包含字母的單詞。
我正在做一個自動完成的搜索box.so，我需要一個查詢，其中包含字母的名稱列中的值作爲用戶類型的字母的行。我與MongoDB的

發帖FullTrace工作：

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'

來源

2015-11-08 ashr81

如果這給你錯誤，這可能意味着某人在模型或ActiveRecord類的某處更改了'where'方法。 –

你可以搜索你的代碼「def where」嗎？ –

另外，你可以發佈完整的回溯？ –

我希望它接受了一封信，找到包含字母的單詞。

這應該工作：

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

更新： 我不熟悉的MongoDB自己，但也許這樣的事情會工作：

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

僅供參考見： How to query MongoDB with "like"?

來源

2015-11-08 18:57:16

啊！我錯過了他沒有寫「LIKE」。 :) –

OP使用的是Mongoid/MongoDB，而不是ActiveRecord/SQL，MongoDB中沒有LIKE，也不能使用SQL snippets。 –

您正在使用Mongoid和MongoDB，因此您不能使用小的SQL片段（如'name = ?'）和where。 Mongoid的where只能理解單個哈希，因此對於錯誤的參數個數有所抱怨。同樣，你不能在查詢中使用%和LIKE，因爲這是SQL和MongoDB不理解SQL。

這工作：

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

，因爲你只有通過where一個哈希參數。但是，這：

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

正試圖使用SQL與MongoDB，並且不起作用。

如果你想要做的MongoDB的模式匹配，那麼你可以使用正則表達式：

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

請注意，我使用Regexp.escape在params[:name]正確逃避什麼，也正則表達式的語法，我也做一個不區分大小寫的匹配。

來源

2015-11-08 19:40:17

Rails活動記錄哪裏方法錯誤與傳遞兩個參數與Mongo數據庫

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