Hello,
I have two ActiveRecord classes. One is Route the other is Waypoints.
I have constructed an XML representation so I can use AJAX to create a
Route with all waypoints in a single create call to RouteController.
When I call Route.from_xml(xmlString) it is not returning an object -
it's leaving the object (@route) nil, but not erroring. Any ideas?
Here's some code:
RoutesController:
def create
@route = nil;
if params[:requestXML]
# unserialise from XML using ROXML
@route = Route.from_xml(params[:requestXML]);
else
@route = Route.new(params[:route])
end
respond_to do |format|
#The following line unsurprisingly fails, as @route is nil
if @route.save
flash[:notice] = 'Route was successfully created.'
format.html { redirect_to(@route) }
format.xml { render :xml => @route, :status
=> :created, :location => @route }
format.js
else
format.html { render :action => "new" }
format.xml { render :xml => @route.errors, :status
=> :unprocessable_entity }
end
end
end
Route.rb:
class Route < ActiveRecord::Base
include ROXML
has_many :waypoints
xml_reader :title
xml_reader :totalDist
xml_reader :totalMis
xml_reader :totalHg
xml_reader :lonlatx
xml_reader :lonlaty
xml_reader :grcenter
xml_accessor :waypoints, [Waypoint], :in => "waypoints"
end
Waypoint.rb:
class Waypoint < ActiveRecord::Base
include ROXML
belongs_to :route
xml_reader :isLeg
xml_reader :lonlatx
xml_reader :lonlaty
xml_reader :gridReference
xml_reader :ascent
xml_reader :descent
xml_reader :distance
xml_reader :bearing
xml_reader :timemins
end
NB I've not specified types at the moment for the above elements. I'm
just trying to verify that the XML is being parsed by ROXML's from_xml
method.
Error Message in logs:
Processing RoutesController#create (for 127.0.0.1 at 2009-02-03
16:36:12) [POST]
Session ID:
BAh7DToMY3NyZl9pZCIlZWY5NWRjODFjMTI5ZDg3ZDlhZGRjODM0ODA3NmZl
YTE6DW5hdnN0YWNrWwYiBi86DnJldHVybl90byIaL2FkYW1mb3dsZXIvZGFz
aGJvYXJkOhBsYXN0X2FjdGl2ZVU6IEFjdGl2ZVN1cHBvcnQ6OlRpbWVXaXRo
Wm9uZVsISXU6CVRpbWUNb0MbgAAAwMEGOh9AbWFyc2hhbF93aXRoX3V0Y19j
b2VyY2lvblQiCFVUQ0AMOgl1c2VyaRM6C2ZvcnVtc3sAOgt0b3BpY3NADiIK
Zmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNoSGFzaHsG
Ogtub3RpY2UiJFJvdXRlIHdhcyBzdWNjZXNzZnVsbHkgY3JlYXRlZC4GOgpA
dXNlZHsGOxBU--48a6d44f6baa5129fd1160815273a9c30ca746a8
Parameters: {"requestXML"=>"<route><totalDist>11185.321521477119</
totalDist><totalHg>640</totalHg><totalMins>235.75000000000003</
totalMins><lonlatx>357865</lonlatx><lonlaty>271635</
lonlaty><grcenter>SH 71635 57865</
grcenter><waypoints><waypoint><isLeg>false</isLeg><lonlatx>357290</
lonlatx><lonlaty>271650</lonlaty><gridReference>SH 71650 57290</
gridReference><ascent>81</ascent><descent>220</descent><distance>0</
distance><bearing>0</bearing></waypoint><waypoint><isLeg>false</
isLeg><lonlatx>357260</lonlatx><lonlaty>274600</
lonlaty><gridReference>SH 74600 57260</gridReference><ascent>275</
ascent><descent>48</descent><distance>2950.152538429157</
distance><bearing>91</bearing></waypoint><waypoint><isLeg>false</
isLeg><lonlatx>359160</lonlatx><lonlaty>273330</
lonlaty><gridReference>SH 73330 59160</gridReference><ascent>73</
ascent><descent>170</descent><distance>2285.3664913969487</
distance><bearing>326</bearing></waypoint><waypoint><isLeg>false</
isLeg><lonlatx>359170</lonlatx><lonlaty>270050</
lonlaty><gridReference>SH 70050 59170</gridReference><ascent>182</
ascent><descent>172</descent><distance>3280.015243867016</
distance><bearing>270</bearing></waypoint><waypoint><isLeg>false</
isLeg><lonlatx>357470</lonlatx><lonlaty>269740</
lonlaty><gridReference>SH 69740 57470</gridReference><ascent>29</
ascent><descent>107</descent><distance>1728.0335644888382</
distance><bearing>190</bearing></waypoint><waypoint><isLeg>false</
isLeg><lonlatx>356840</lonlatx><lonlaty>270440</
lonlaty><gridReference>SH 70440 56840</gridReference><ascent>640</
ascent><descent>717</descent><distance>941.7536832951597</
distance><bearing>132</bearing></waypoint></waypoints></route>",
"authenticity_token"=>"a538a4ed8056e17ded2904abfb00628ff6594a07",
"action"=>"create", "controller"=>"routes"}
[globalite] loading locale: en-US from config
[globalite] Locale set to en-US
[globalite] loading locale: en-US from config
[globalite] Locale set to en-US
NoMethodError (You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.delete):
/Library/Ruby/Gems/1.8/gems/activerecord-2.1.2/lib/active_record/
transactions.rb:124:in `rollback_active_record_state!'
/Library/Ruby/Gems/1.8/gems/activerecord-2.1.2/lib/active_record/
transactions.rb:106:in `save'
/app/controllers/routes_controller.rb:52:in `create'
/Library/Ruby/Gems/1.8/gems/actionpack-2.1.2/lib/action_controller/
mime_responds.rb:106:in `call'
/Library/Ruby/Gems/1.8/gems/actionpack-2.1.2/lib/action_controller/
mime_responds.rb:106:in `respond_to'
/app/controllers/routes_controller.rb:51:in `create'
...
Thanks,
Adam.
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