如何在Rails控制器中讀取json？

Question

所以，我做的一樣，在我的控制器操作：

json_document = JSON(params) (json gem) 

如果我打印json_document它給了我一個JSON這樣的：

{"createdAt":"Mar 6, 2012 6:12:54 PM","id":177139718620856322,"text":"@rgjunio where?","source":"web","isTruncated":false,"inReplyToStatusId":177139644012572673, ... 

但是，當我嘗試訪問它：

tweet = Complaint.find_by_twitter_status json_document["inReplyToStatusId"] 

我得到以下錯誤：

can't convert ActiveSupport::HashWithIndifferentAccess into String 

所以我試圖用符號另一種方式：

tweet = Complaint.find_by_twitter_status json_document[:inReplyToStatusId] 

，但它給我的錯誤：

TypeError (can't convert Symbol into Integer) 

任何想法？

更新： 如果我使用PARAMS [：inReplyToStatusId] isntead我有以下幾點：

ActiveRecord::StatementInvalid (PG::Error: ERROR: operator does not exist: character varying = bigint 
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. 
SELECT "complaints".* FROM "complaints" WHERE "complaints"."twitter_status" = 177144980450721794 LIMIT 1): 

Answer 1

嘗試：

params[:inReplyToStatusId].to_s