ArgumentError: wrong number of arguments (given 0, expected 1+)

[bsa7]

Expected behavior vs actual behavior

in lib/active_model/serializer.rb:340:in initialize'`:

return Enumerator.new unless object

throw error:
ArgumentError: wrong number of arguments (given 0, expected 1+)

Steps to reproduce

(e.g., detailed walkthrough, runnable script, example application)

when i read documentation for Enumerator, i'm find, that it's expect minimum one argument, but in line 340 no arguments passed.

Environment

ActiveModelSerializers Version 0.10.6:

Output of ruby -e "puts RUBY_DESCRIPTION": ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]

OS Type & Version: Linux u116 4.10.0-19-generic #21-Ubuntu SMP Thu Apr 6 17:04:57 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Integrated application and version (e.g., Rails, Grape, etc):
rails-5.0.5

Backtrace

(e.g., provide any applicable backtraces from your application)

../active_model_serializers-0.10.6/lib/active_model/serializer.rb:340:in `initialize'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:340:in `new'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:340:in `associations'",
../active_model_serializers-0.10.6/lib/active_model/serializer/concerns/caching.rb:195:in `block in object_cache_keys'",
../active_model_serializers-0.10.6/lib/active_model/serializer/collection_serializer.rb:5:in `each'",
../active_model_serializers-0.10.6/lib/active_model/serializer/collection_serializer.rb:5:in `each'",
../active_model_serializers-0.10.6/lib/active_model/serializer/concerns/caching.rb:192:in `object_cache_keys'",
../active_model_serializers-0.10.6/lib/active_model/serializer/concerns/caching.rb:177:in `cache_read_multi'",
../active_model_serializers-0.10.6/lib/active_model/serializer/collection_serializer.rb:23:in `serializable_hash'",
../active_model_serializers-0.10.6/lib/active_model/serializer/association.rb:56:in `serializable_hash'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:401:in `block in associations_hash'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:348:in `yield'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:348:in `block (2 levels) in associations'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:343:in `each'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:343:in `block in associations'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:399:in `each'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:399:in `each_with_object'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:399:in `associations_hash'",
../active_model_serializers-0.10.6/lib/active_model/serializer.rb:360:in `serializable_hash'",

Additonal helpful information

(e.g., Gemfile.lock, configurations, PR containing a failing test, git bisect results)

AMS 0.10.6

[andrjuha01]

@r72cccp Sorry, I can be wrong right here, but in documentation you can really find another example of creating object.
new(size = nil) { |yielder| ... }.
In that way, the size would be nil, but it would yield a block given after it.
Like here:

fib = Enumerator.new do |y|
  a = b = 1
  loop do
    y << a
    a, b = b, a + b
  end
end

[drn]

I ran into this as well.

I didn't track down the reason why object did not exist, but this pull addresses the issue -
#2179

irb(main):001:0> Enumerator.new
ArgumentError: wrong number of arguments (given 0, expected 1+)
        from (irb):1:in `initialize'
        from (irb):1:in `new'
        from (irb):1
        from /Users/darrencheng/.rbenv/versions/2.3.0/bin/irb:11:in `<main>'
irb(main):002:0> Enumerator.new { }
=> #<Enumerator: #<Enumerator::Generator:0x007fdc64b55a20>:each>

[bf4]

Hmm, don't know how I missed that in implementation and test

[bf4]

Fixed by #2179