[DRE-maint] Bug#832133: ruby-json 2.0 broke rails: metabug to prevent testing migration

[Pirate Praveen]

package: ruby-json
version: 2.0.1+dfsg-1
severity: grave

ruby-json upload just broke rails and a whole lot of dependencies.

The following packages have unmet dependencies:
 ruby-activesupport : Depends: ruby-json (< 2.0) but 2.0.1+dfsg-1 is to
be installed

One sample failure
https://ci.debian.net/data/packages/unstable/amd64/r/ruby-validate-url/latest-autopkgtest/log.gz

We need to test compatibility of all these reverse dependencies. It
would have been much better if we tested these _before_ the upload.

$ apt-cache rdepends ruby-json|uniq
ruby-json
Reverse Depends:
  ruby-swd
  whatweb
  tdiary
 |shelr
  ruby-twitter-oauth
  ruby-tinder
  ruby-activesupport
  ruby-source-map
  ruby-simplecov
  ruby-sidekiq
  ruby-sequel
  ruby-sdoc
  ruby-ridley
  ruby-rabl-rails
  ruby-rabl
  ruby-openstack
  ruby-omniauth-twitter
  ruby-json-schema
  ruby-influxdb
  ruby-gon
  ruby-gemojione
  ruby-gelf
  ruby-fog-libvirt
  ruby-azure
  ruby-aws-sdk
  ruby-autoprefixer-rails
  ruby-asetus
  ruby-appraiser
  how-can-i-help
  ruby-activesupport
  r10k
  pcs
  opennebula-context
  opennebula-sunstone
  opennebula-gate
  opennebula-flow
  mikutter
  mcollective-common
  librarian-puppet
  coquelicot
  hiera
  gist
  fencing-agent
  fuel-nailgun-agent
  foremancli
  facter
  diaspora

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