Rails6 Incompability for 1.0.45

[feapaydin]

Rails: 6.0.2.1
Ruby: 2.7.0p0 (2019-12-25 revision 647ee6f091)
Bundler: 2.1.4

Release 1.0.45 seems to fail when installing with bundler in Rails6.

I have created a brand new Rails6 project and added iyzipay to the gemfile.
When I run bundle, bundler installs version 1.0.44 of the gem,
which depends on rest-client ~> 1.8, which is not working properly as tests shows that:

...
KeyError:
      key not found: :ciphers
      # /Users/furkanenes/.rvm/gems/ruby-2.7.0/gems/rest-client-1.8.0/lib/restclient/request.rb:163:in `fetch'
      # /Users/furkanenes/.rvm/gems/ruby-2.7.0/gems/rest-client-1.8.0/lib/restclient/request.rb:163:in `initialize'
      # /Users/furkanenes/.rvm/gems/ruby-2.7.0/gems/rest-client-1.8.0/lib/restclient/request.rb:41:in `new'
      # /Users/furkanenes/.rvm/gems/ruby-2.7.0/gems/rest-client-1.8.0/lib/restclient/request.rb:41:in `execute'
      # /Users/furkanenes/.rvm/gems/ruby-2.7.0/gems/rest-client-1.8.0/lib/restclient.rb:69:in `post'
      # ./lib/iyzipay/http_client.rb:8:in `post'
      # ./lib/iyzipay/model/threeds_payment.rb:12:in `retrieve'
      # ./spec/threeds_payment_spec.rb:218:in `block (2 levels) in <top (required)>'
...
# Same error occurs in all 39 tests

I believe this is a rest-client related problem due to this issue.

The solution is simply updating rest-client to ~> 2.0, which is already done in iyzipay 1.0.45.
But the problem is that when you force bundler to install iyzipay 1.0.45 in your gemfile, like:

gem 'iyzipay', '~> 1.0.45'
# or
gem 'iyzipay', '1.0.45'

Following output occurs when you run bundle:

Fetching gem metadata from https://rubygems.org/............
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Bundler could not find compatible versions for gem "rack":
  In snapshot (Gemfile.lock):
    rack (= 2.2.2)

  In Gemfile:
    rails (~> 6.0.2, >= 6.0.2.1) was resolved to 6.0.2.1, which depends on
      actionpack (= 6.0.2.1) was resolved to 6.0.2.1, which depends on
        rack (~> 2.0, >= 2.0.8)

    iyzipay (~> 1.0.45) was resolved to 1.0.45, which depends on
      rack (~> 1.6.4)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

I think the problem is that rack dependency of rails6 (actionpack 6) fails to comply with iyzipay rack dependency, which is 1.6.4.

I have forked the repository and updated rack dependency to 2.0, which forced me to update rspec and rspec-rails dependencies to 3.8.0.

Currenty the tests and my rails6 project are working perfectly well but further testing is required in order to maintain backwards compability of the gem.

I'll generate a PR and hope that this simple solution works for everybody.