I have the 4 node riak setup running on my os x machine. I have the following program -
require 'riak'
class RiakClient < Riak::Client
#attr_accessor :bucket
def initialize(hosts="")
return Riak::Client.new(:nodes => [{:http_port => 8091},{:http_port =>8092},{:http_port=>8093},{:http_port =>8094}])
end
def get_me(bucket, key)
obj = self.bucket(bucket).get(key)
puts obj.data
end
def put_me(bucket, key, data, content_type)
obj=self.bucket(bucket).get_or_new(key)
puts obj.class
obj.content_type=content_type
obj.raw_data=data
obj.store
end
end
if __FILE__ == $0
my_client=RiakClient.new
my_client.put_me("doc", "index.html", "some data goes here", "text/html")
hash=my_client.get_me("doc", "index.html")
end
I am getting the following error
NilClass
riak_client.rb:32:in `put_me': undefined method `content_type=' for nil:NilClass (NoMethodError)
from riak_client.rb:42:in `<main>'
Do I have to import the RiakBucket and RiakObject classes? It seems that the RiakBucket methods cannot be accessed here?
The actual question here is: why does get_or_new return nil?
It's probably because your initialize() method returns a new Riak::Client, but the Riak::Client that is your parent object never gets initialized. Try putting a call to super instead of the return Riak::Client.new in initialize.
Subclassing Riak::Client is a bit dubious here. I would tend to delegate to it instead.
Related
While debugging a really strange issue with ActionMailer, I came to realize I didn't know how to access an object that was creating the exception. Not the exception, but the object itself.
begin
AppMailer.send_invoice(hostel_resident).deliver_later
flash[:success] = "Your invoice was sent successfully!"
rescue => msg
# display the system generated error message
flash[:error] = "#{msg}"
end
NoMethodError: undefined method `disposition_type' for #<Mail::UnstructuredField:0x009g71c2a68258>
This code works great to catch any exceptions and print the message.
However, how do I get ahold of the <Mail::UnstructuredField:0x009g71c2a68258> object? I'd like to be able to play around with this guy, read messages inside it, and just generally have access to it.
This has to be possible, but inspect doesn't help, cause is no use and backtrace just shows you where it happened. I need that object though, the receiver of the nonexistent method.
Thanks!
actionmailer (4.2.4)
mail (2.6.3)
Seems like you're using mail gem. This is a known issue which is already reported in the GitHub. See #851.
Try using different version of the gem, something in 2.6 series.
This seems to work, using receiver on NameError (which NoMethodError is a child of)
obj = Object.new
puts obj.to_s
begin
obj.do_something
rescue NoMethodError => e
puts e.message
puts e.receiver
end
# #<Object:0x007fa5ac84da88>
# undefined method `do_something' for #<Object:0x007fa5ac84da88>
# #<Object:0x007fa5ac84da88>
This seems to require ruby >= 2.3, to do this for < 2.3, AFAIK you have to do something like this (not tested in older rubies, but should work):
class MyNoMethodError < NoMethodError
attr_accessor :my_receiver
end
obj = Object.new
puts obj.to_s
begin
begin
obj.do_something
rescue NoMethodError => e
# rescue the exception and wrap it in the method that caused it, using `self` instead of `obj`
error = MyNoMethodError.new(e)
error.my_receiver = obj
raise error
end
rescue MyNoMethodError => c
puts c.inspect # custom exception stuff
puts c.cause.inspect # original exception stuff
puts c.my_receiver
end
# #<Object:0x007f884e846d58>
# #<MyNoMethodError: undefined method `do_something' for #<Object:0x007f884e846d58>>
# #<NoMethodError: undefined method `do_something' for #<Object:0x007f884e846d58>>
# #<Object:0x007f884e846d58>
I have the below Fluentd plugin code:
require 'avro'
module Fluent
module TextFormatter
class Sample
end
class AvroFormatter < Formatter
Fluent::Plugin.register_formatter('avro', self)
config_param :schema_file, :string, :default => nil
config_param :schema_json, :string, :default => nil
def configure(conf)
super
if not (#schema_json.nil? ^ #schema_file.nil?) then
raise Fluent::ConfigError, 'schema_json or schema_file (but not both) is required'
end
if #schema_json.nil? then
#schema_json = File.read(#schema_file)
end
#schema = Avro::Schema.parse(#schema_json)
end
def format(tag, time, record)
handler = Sample.new()
end
end
end
end
And I need to instance the class "Sample" in the def "Format". The problem is that when I try to do a http POST against Fluentd the below error appears:
failed: error_class=NoMethodError error="undefined method `bytesize'
This error only appears when the class "Sample" is instanced. I'm new with ruby, and I don't know where is the problem. Should I create the class "Sample" in another file?
I think you're getting this error because code, that calls format expects string result, but instead it gets an instance of Sample class. Try to return some string instead.
You can also use this example here: http://docs.fluentd.org/articles/plugin-development#text-formatter-plugins.
I know in ruby, when we call an instance method, we need to firstly instantiate a class object.
But when I see a open sourced code I got confused.
The code is like this:
File Message.rb
require 'json'
module Yora
module Message
def serialize(msg)
JSON.generate(msg)
end
def deserialize(raw, symbolized_key = true)
msg = JSON.parse(raw, create_additions: true)
if symbolized_key
Hash[msg.map { |k, v| [k.to_sym, v] }]
else
msg
end
end
end
end
File. Persistance.rb
require 'fileutils'
require_relative 'message'
module Yora
module Persistence
class SimpleFile
include Message
def initialize(node_id, node_address)
#node_id, #node_address = node_id, node_address
FileUtils.mkdir_p "data/#{node_id}"
#log_path = "data/#{node_id}/log.txt"
#metadata_path = "data/#{node_id}/metadata.txt"
#snapshot_path = "data/#{node_id}/snapshot.txt"
end
def read_metadata
metadata = {
current_term: 0,
voted_for: nil,
cluster: { #node_id => #node_address }
}
if File.exist?(#metadata_path)
metadata = deserialize(File.read(#metadata_path)) #<============
end
$stderr.puts "-- metadata = #{metadata}"
metadata
end
.....
You can see the line I marked with "<==="
It uses deserialize function that been defined in message class.
And from message class we can see that method is a instance method, not class method.
So why can we call it without instantiating anything like this?
thanks
Message ist an module. Your Class SimpleFile includes this module. so the module methods included in your class SimpleFile. that means, all module methods can now be used like as methods from SimpleFile
see http://ruby-doc.org/core-2.2.0/Module.html for more infos about module in ruby. it's a great feature.
It is being called on an instance. In Ruby, if you leave out the explicit receiver of the message send, an implicit receiver of self is assumed. So, deserialize is being called on an instance, namely self.
Note that this exact same phenomenon also occurs in other places in your code, much earlier (in line 1, in fact):
require 'fileutils'
require_relative 'message'
Here, you also have two method calls without an explicit receiver, which means that the implicit receiver is self.
I am trying to Implement Gibberish encryption using the following class:
class Encrypt
def initialize()
#cipher = Gibberish::AES.new("Kudzu")
end
def encode(caller)
if((caller.is_a? Account) || (caller.is_a? Atm))
return #cipher.enc("Kumquat")
else
return false
end
end
def decode(caller, key)
if((caller.is_a? Account) || (caller.is_a? Atm))
return #cipher.dec(key)
else
return false
end
end
end
Instantiating using:
$encrypt = Encrypt.new
and calling in my Atm class using:
#key = $encrypt.encode(self)
The error i receive is thus:
undefined method `encode' for nil:NilClass (NoMethodError)
Is there something i'm not understanding about gibberish or some other silly error on my part?
Also in my Account class:
#key = $encrypt.decode(self, $encrypt.encode(self))
$encrypt is ending up nil somehow in your Atm class. Can't be much more helpful without seeing all the code. Keep in mind that Global Variables are Evil (using $variable in ruby) and try to rework your code so you don't need them..
What I am missing? I am trying to use a rest service for with Active resource, I have the following:
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
And the following output for the user:
#<User:0x1011a2d20 #prefix_options={}, #attributes={"name"=>"Test", "email"=>"test.user#domain.com"}>
and this error:
/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
If I user curl for my rest service it would be like:
curl -v -X POST -H 'Content-Type: application/json' -d '{"name":"test curl", "email":"test#gmail.com"}' http://localhost:3000/users
with the response:
{"email":"test#gmail.com","name":"test curl","admin":false,"uuid":"afb8c98b-562a-4603-bbe4-f8f0816cef0d","creation_limit":5}
There is a built-in type named Data, whose purpose is rather mysterious. You appear to be bumping into it:
$ ruby -e 'Data.new'
-e:1:in `new': allocator undefined for Data (TypeError)
from -e:1
The question is, how did it get there? The last stack frame puts us here. So, it appears Data wandered out of a call to find_or_create_resource_for. The code branch here looks likely:
$ irb
>> class C
>> end
=> nil
>> C.const_get('Data')
=> Data
This leads me to suspect you have an attribute or similar floating around named :data or "data", even though you don't mention one above. Do you? Particularly, it seems we have a JSON response with a sub-hash whose key is "data".
Here's a script that can trigger the error for crafted input, but not from the response you posted:
$ 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
produces..
$ ./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
If I were you, I would open /Library/Ruby/Gems/1.8/gems/activeresource-3.0.10/lib/active_resource/base.rb, find load_attributes_from_response on line 1320 and temporarily change
load(self.class.format.decode(response.body))
to
load(self.class.format.decode(response.body).tap { |decoded| puts "Decoded: #{decoded.inspect}" })
..and reproduce the error again to see what is really coming out of your json decoder.
I just ran into the same error in the latest version of ActiveResource, and I found a solution that does not require monkey-patching the lib: create a Data class in the same namespace as the ActiveResource object. E.g.:
class User < ActiveResource::Base
self.site = "http://localhost:3000/"
self.element_name = "users"
self.format = :json
class Data < ActiveResource::Base; end
end
Fundamentally, the problem has to do with the way ActiveResource chooses the classes for the objects it instantiates from your API response. It will make an instance of something for every hash in your response. For example, it'll want to create User, Data and Pet objects for the following JSON:
{
"name": "Bob",
"email": "bob#example.com",
"data": {"favorite_color": "purple"},
"pets": [{"name": "Puffball", "type": "cat"}]
}
The class lookup mechanism can be found here. Basically, it checks the resource (User) and its ancestors for a constant matching the name of the sub-resource it wants to instantiate (i.e. Data here). The exception is caused by the fact that this lookup finds the top-level Data constant from the Stdlib; you can therefore avoid it by providing a more specific constant in the resource's namespace (User::Data). Making this class inherit from ActiveResource::Base replicates the behaviour you'd get if the constant was not found at all (see here).
Thanks to phs for his analysis - it got me pointed in the right direction.
I had no choice but to hack into ActiveResource to fix this problem because an external service over which I have no control had published an API where all attributes of the response were tucked away inside a top-level :data attribute.
Here's the hack I ended up putting in config/initializers/active_resource.rb to get this working for me using active resource 3.2.8:
class ActiveResource::Base
def load(attributes, remove_root = false)
raise ArgumentError, "expected an attributes Hash, got #{attributes.inspect}" unless attributes.is_a?(Hash)
#prefix_options, attributes = split_options(attributes)
if attributes.keys.size == 1
remove_root = self.class.element_name == attributes.keys.first.to_s
end
# THIS IS THE PATCH
attributes = ActiveResource::Formats.remove_root(attributes) if remove_root
if data = attributes.delete(:data)
attributes.merge!(data)
end
# END PATCH
attributes.each do |key, value|
#attributes[key.to_s] =
case value
when Array
resource = nil
value.map do |attrs|
if attrs.is_a?(Hash)
resource ||= find_or_create_resource_for_collection(key)
resource.new(attrs)
else
attrs.duplicable? ? attrs.dup : attrs
end
end
when Hash
resource = find_or_create_resource_for(key)
resource.new(value)
else
value.duplicable? ? value.dup : value
end
end
self
end
class << self
def find_every(options)
begin
case from = options[:from]
when Symbol
instantiate_collection(get(from, options[:params]))
when String
path = "#{from}#{query_string(options[:params])}"
instantiate_collection(format.decode(connection.get(path, headers).body) || [])
else
prefix_options, query_options = split_options(options[:params])
path = collection_path(prefix_options, query_options)
# THIS IS THE PATCH
body = (format.decode(connection.get(path, headers).body) || [])
body = body['data'] if body['data']
instantiate_collection( body, prefix_options )
# END PATCH
end
rescue ActiveResource::ResourceNotFound
# Swallowing ResourceNotFound exceptions and return nil - as per
# ActiveRecord.
nil
end
end
end
end
I solved this using a monkey-patch approach, that changes "data" to "xdata" before running find_or_create_resource_for (the offending method). This way when the find_or_create_resource_for method runs it won't search for the Data class (which would crash). It searches for the Xdata class instead, which hopefully doesn't exist, and will be created dynamically by the method. This will be a a proper class subclassed from ActiveResource.
Just add a file containig this inside config/initializers
module ActiveResource
class Base
alias_method :_find_or_create_resource_for, :find_or_create_resource_for
def find_or_create_resource_for(name)
name = "xdata" if name.to_s.downcase == "data"
_find_or_create_resource_for(name)
end
end
end