CONVER零到字符串紅寶石POST

Question

我得到了Ruby on Rails的POST，它具有以下輸出的一個問題：

Started POST "/550-674-359/pictures" for 127.0.0.1 at 2012-07-16 15:30:53 -0400 

Processing by PicturesController#create as JSON 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"S33+XBxaGA7J+VWrr59CXKsZDk6lsI0/rBfHoYsCUUw=", "expiration_date"=>"1", "alignment"=>"center", "picture"=>{"image"=>[#<ActionDispatch::Http::UploadedFile:0x000001009a7a08 @original_filename="Sunflower.gif", @content_type="image/gif", @headers="Content-Disposition: form-data; name=\"picture[image][]\"; filename=\"Sunflower.gif\"\r\nContent-Type: image/gif\r\n", @tempfile=#<File:/var/folders/zZ/zZurKpTZFDm2y34FYgB3PLtShpg/-Tmp-/RackMultipart20120716-21348-j6977v>>]}, "url_id"=>"550-674-359"} 
    Gallery Load (0.3ms) SELECT "galleries".* FROM "galleries" WHERE "galleries"."url_id" = '550-674-359' LIMIT 1 
    (0.1ms) begin transaction 
Binary data inserted for `string` type on column `image` 
    SQL (0.7ms) INSERT INTO "pictures" ("created_at", "description", "gallery_id", "gallery_url_id", "image", "order_number", "original_filename", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?) [["created_at", Mon, 16 Jul 2012 19:30:53 UTC +00:00], ["description", nil], ["gallery_id", 28], ["gallery_url_id", "550-674-359"], ["image", "d2792dbf99.gif"], ["order_number", nil], ["original_filename", "Sunflower.gif"], ["updated_at", Mon, 16 Jul 2012 19:30:53 UTC +00:00]] 
    (0.6ms) rollback transaction 
Completed 500 Internal Server Error in 24ms 

TypeError (can't convert nil into String): 
    app/controllers/pictures_controller.rb:60:in `create' 

這裏與線60 create方法明確標明：

# POST /pictures 
    # POST /pictures.json 
    def create 
    # Creates a picture class instance based on the json objects being passed in from 
    # Carrierwave 
    p_attr = params[:picture] 
    p_attr[:image] = params[:picture][:image].first if params[:picture][:image].class == Array 

    # Gets the gallery vai the uuid gallery url 
    @gallery = Gallery.where(:url_id => params[:url_id]).first 
    # Builds the picture based on the attributes passed in above from the json 
    @picture = @gallery.pictures.build(p_attr) 
    # Assigns the gallery_url_id attribute 
    @picture.gallery_url_id = @gallery.url_id 

    # Handle the picture save according to success or not 
    **LINE 60 ->**if @picture.save 
     puts @picture.inspect 
     respond_to do |format| 
     format.html { 
      # Calls the method in the model to format the json repsonse 
      render :json => [@picture.to_jq_upload].to_json, 
      :content_type => 'text/html', 
      :layout => false 
     } 
     format.json { 
      render :json => [@picture.to_jq_upload].to_json 
     } 
     end 
    else 
     render :json => [{:error => "custom_failure"}], :status => 304 
    end 
    end 

在哪裏，我試圖確保沒有零正在試圖推到數據庫中的模型：

class Picture < ActiveRecord::Base 

    # The attributes accesible via an @picture 
    attr_accessible :gallery_id, :description, :image, :gallery_url_id, :original_filename, :order_number 
    belongs_to :gallery 

    # Attatches the carrierwave uploader to the picture class 
    mount_uploader :image, ImageUploader 

    # Referenced when each picture is created, the json is formatted as the following form 
    def to_jq_upload 
    { 

     "name" => read_attribute(:image), 
     "size" => image.size, 
     "url" => image.url, 
     "thumbnail_url" => image.thumb.url, 
     "delete_url" => id, 
     "picture_id" => id, 
     "delete_type" => "DELETE", 
     "url_id" => read_attribute(:gallery_url_id), 
     "original_filename" => read_attribute(:original_filename), 
     "order_number" => testParams(read_attribute(:order_number)), 
     "description" => testParams(read_attribute(:description)) 
    } 
    end 

    def testParams(id) 
    if id == nil 
     return "" 
    else 
     return id 
    end 

    end 

end 

從我可以告訴它，似乎任何order_number或描述是這個問題的來源。我認爲我創建的名爲testParams的方法會檢查並相應處理，但我想它不會。我怎樣才能解決這個問題？

編輯：這裏全堆棧跟蹤...

fog (1.0.0) lib/fog/core/hmac.rb:23:in `digest' 
fog (1.0.0) lib/fog/core/hmac.rb:23:in `block in setup_sha1' 
fog (1.0.0) lib/fog/core/hmac.rb:15:in `call' 
fog (1.0.0) lib/fog/core/hmac.rb:15:in `sign' 
fog (1.0.0) lib/fog/aws/storage.rb:352:in `signature' 
fog (1.0.0) lib/fog/aws/storage.rb:360:in `request' 
fog (1.0.0) lib/fog/aws/requests/storage/put_object.rb:43:in `put_object' 
fog (1.0.0) lib/fog/aws/models/storage/file.rb:119:in `save' 
fog (1.0.0) lib/fog/core/collection.rb:50:in `create' 
carrierwave (0.6.2) lib/carrierwave/storage/fog.rb:250:in `store' 
carrierwave (0.6.2) lib/carrierwave/storage/fog.rb:84:in `store!' 
carrierwave (0.6.2) lib/carrierwave/uploader/store.rb:59:in `block in store!' 
carrierwave (0.6.2) lib/carrierwave/uploader/callbacks.rb:17:in `with_callbacks' 
carrierwave (0.6.2) lib/carrierwave/uploader/store.rb:58:in `store!' 
carrierwave (0.6.2) lib/carrierwave/mount.rb:345:in `store!' 
carrierwave (0.6.2) lib/carrierwave/mount.rb:217:in `store_image!' 
activesupport (3.2.6) lib/active_support/callbacks.rb:427:in `_run__2057521342514191385__save__4069718005166547559__callbacks' 
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_save_callbacks' 
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks' 
activerecord (3.2.6) lib/active_record/callbacks.rb:264:in `create_or_update' 
activerecord (3.2.6) lib/active_record/persistence.rb:84:in `save' 
activerecord (3.2.6) lib/active_record/validations.rb:50:in `save' 
activerecord (3.2.6) lib/active_record/attribute_methods/dirty.rb:22:in `save' 
activerecord (3.2.6) lib/active_record/transactions.rb:241:in `block (2 levels) in save' 
activerecord (3.2.6) lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status' 
activerecord (3.2.6) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction' 
activerecord (3.2.6) lib/active_record/transactions.rb:208:in `transaction' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/method_tracer.rb:491:in `block in transaction_with_trace_ActiveRecord_self_name_transaction' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/method_tracer.rb:486:in `transaction_with_trace_ActiveRecord_self_name_transaction' 
activerecord (3.2.6) lib/active_record/transactions.rb:293:in `with_transaction_returning_status' 
activerecord (3.2.6) lib/active_record/transactions.rb:241:in `block in save' 
activerecord (3.2.6) lib/active_record/transactions.rb:252:in `rollback_active_record_state!' 
activerecord (3.2.6) lib/active_record/transactions.rb:240:in `save' 
app/controllers/pictures_controller.rb:60:in `create' 
actionpack (3.2.6) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (3.2.6) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.2.6) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.2.6) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.2.6) lib/active_support/callbacks.rb:414:in `_run__3078682991788211307__process_action__1687541676864999030__callbacks' 
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.6) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.2.6) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (3.2.6) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.2.6) lib/active_support/notifications.rb:123:in `block in instrument' 
activesupport (3.2.6) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (3.2.6) lib/active_support/notifications.rb:123:in `instrument' 
actionpack (3.2.6) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.2.6) lib/action_controller/metal/params_wrapper.rb:206:in `process_action' 
activerecord (3.2.6) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:34:in `block in process_action' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:257:in `block in perform_action_with_newrelic_trace' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:252:in `perform_action_with_newrelic_trace' 
newrelic_rpm (3.4.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:33:in `process_action' 
actionpack (3.2.6) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.2.6) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.2.6) lib/action_controller/metal.rb:203:in `dispatch' 
actionpack (3.2.6) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.2.6) lib/action_controller/metal.rb:246:in `block in action' 
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:73:in `call' 
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' 
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:36:in `call' 
journey (1.0.4) lib/journey/router.rb:68:in `block in call' 
journey (1.0.4) lib/journey/router.rb:56:in `each' 
journey (1.0.4) lib/journey/router.rb:56:in `call' 
actionpack (3.2.6) lib/action_dispatch/routing/route_set.rb:600:in `call' 
newrelic_rpm (3.4.0.1) lib/new_relic/rack/browser_monitoring.rb:12:in `call' 
newrelic_rpm (3.4.0.1) lib/new_relic/rack/developer_mode.rb:24:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
rack (1.4.1) lib/rack/etag.rb:23:in `call' 
rack (1.4.1) lib/rack/conditionalget.rb:35:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call' 
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context' 
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call' 
activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call' 
activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__3679119317333771623__call__4069718005166547559__callbacks' 
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback' 
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app' 
railties (3.2.6) lib/rails/rack/logger.rb:16:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call' 
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call' 
rack (1.4.1) lib/rack/runtime.rb:17:in `call' 
activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.4.1) lib/rack/lock.rb:15:in `call' 
actionpack (3.2.6) lib/action_dispatch/middleware/static.rb:62:in `call' 
railties (3.2.6) lib/rails/engine.rb:479:in `call' 
railties (3.2.6) lib/rails/application.rb:220:in `call' 
rack (1.4.1) lib/rack/content_length.rb:14:in `call' 
railties (3.2.6) lib/rails/rack/log_tailer.rb:17:in `call' 
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' 
/Users/daniel.flynn/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
/Users/daniel.flynn/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
/Users/daniel.flynn/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' 

Answer 1

我結束了手動設置兩個領域被稱爲拯救行動之前。這不是一個推薦的解決方案，但是這實際上確保了這些參數中有內容，而不是保存到數據庫中。