ruby - 使用 ActiveResource 保存时有 'allocator undefined for Data'

Question

我错过了什么？我正在尝试使用 Active 资源的休息服务，我有以下内容:

class User < ActiveResource::Base
  self.site = "http://localhost:3000/"
  self.element_name = "users"
  self.format = :json
end

user = User.new(
        :name => "Test",
        :email => "test.user@domain.com")

p user 
if user.save
  puts "success: #{user.uuid}"
else
  puts "error: #{user.errors.full_messages.to_sentence}"
end

以及用户的以下输出:

#<User:0x1011a2d20 @prefix_options={}, @attributes={"name"=>"Test", "email"=>"test.user@domain.com"}>

和这个错误:

/Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1233:in `new': allocator undefined for Data (TypeError)
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1233:in `load'
from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1219:in `each'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1219:in `load'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1322:in `load_attributes_from_response'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1316:in `create_without_notifications'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1314:in `tap'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1314:in `create_without_notifications'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/observing.rb:11:in `create'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1117:in `save_without_validation'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/validations.rb:87:in `save_without_notifications'
    from /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/observing.rb:11:in `save'
    from import_rest.rb:22

如果我使用 curl 作为我的休息服务，它会是这样的:

curl -v -X POST -H 'Content-Type: application/json' -d '{"name":"test curl", "email":"test@gmail.com"}' http://localhost:3000/users

响应:

{"email":"test@gmail.com","name":"test curl","admin":false,"uuid":"afb8c98b-562a-4603-bbe4-f8f0816cef0d","creation_limit":5}

Answer 1

有一个名为Data 的内置类型，其用途是rather mysterious。 .你似乎碰到了它:

$ ruby -e 'Data.new'
-e:1:in `new': allocator undefined for Data (TypeError)
  from -e:1

问题是，它是如何到达那里的？最后一个堆栈框架将我们 here .因此，Data 似乎偏离了对 find_or_create_resource_for 的调用。代码分支here看起来很可能:

$ irb
>> class C
>>   end
=> nil
>> C.const_get('Data')
=> Data

这让我怀疑您有一个名为 :data 或 "data" 的属性或类似 float ，即使您没有在上面提到一个。你？特别是，我们似乎有一个带有子哈希的 JSON 响应，其键是“数据”。

这是一个可以触发精心设计的输入错误的脚本，但不是来自您发布的响应:

$ cat ./activeresource-oddity.rb
#!/usr/bin/env ruby

require 'rubygems'
gem 'activeresource', '3.0.10'
require 'active_resource'

class User < ActiveResource::Base
  self.site = "http://localhost:3000/"
  self.element_name = "users"
  self.format = :json
end

USER = User.new :name => "Test", :email => "test.user@domain.com"

def simulate_load_attributes_from_response(response_body)
  puts "Loading #{response_body}.."
  USER.load User.format.decode(response_body)
end

OK = '{"email":"test@gmail.com","name":"test curl","admin":false,"uuid":"afb8c98b-562a-4603-bbe4-f8f0816cef0d","creation_limit":5}'
BORKED = '{"data":{"email":"test@gmail.com","name":"test curl","admin":false,"uuid":"afb8c98b-562a-4603-bbe4-f8f0816cef0d","creation_limit":5}}'

simulate_load_attributes_from_response OK
simulate_load_attributes_from_response BORKED

产生..

$ ./activeresource-oddity.rb 
Loading {"email":"test@gmail.com","name":"test curl","admin":false,"uuid":"afb8c98b-562a-4603-bbe4-f8f0816cef0d","creation_limit":5}..
Loading {"data":{"email":"test@gmail.com","name":"test curl","admin":false,"uuid":"afb8c98b-562a-4603-bbe4-f8f0816cef0d","creation_limit":5}}..
/opt/local/lib/ruby/gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1233:in `new': allocator undefined for Data (TypeError)
    from /opt/local/lib/ruby/gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1233:in `load'
    from /opt/local/lib/ruby/gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1219:in `each'
    from /opt/local/lib/ruby/gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb:1219:in `load'
    from ./activeresource-oddity.rb:17:in `simulate_load_attributes_from_response'
    from ./activeresource-oddity.rb:24

如果我是你，我会打开/Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb，找到load_attributes_from_response在1320行，临时改

load(self.class.format.decode(response.body))

到

load(self.class.format.decode(response.body).tap { |decoded| puts "Decoded: #{decoded.inspect}" })

..并再次重现错误以查看您的 json 解码器真正产生了什么。