Is a gem ready for Rails 4 or 5?

Built for Rails >= 4.1

Added explicit support for Rails 5.

since gem version 1.0.0

since gem version 1.0.0

-

from https://rubyplus.com/articles/4021-ActiveModelSerializer-Basics-in-Rails-5

Use activerecord-import 0.4.0 or higher.

source

since version 0.15.0 (https://github.com/zdennis/activerecord-import/blob/master/CHANGELOG.md#changes-in-0150)

version 0.0.1 is ready

since gem version 1.0.0

why not?

According to changelog ready from 1.2.0 https://github.com/brianhempel/active_record_union#changelog

ready from gem version 3.4.0 (source)

with the master branch

See comment of jonty davis below

0.5.0

since version 2.4.1

since version 4.0.0

no dependency on Rails

no dependency on Rails

ok

from https://github.com/thoughtbot/administrate/pull/636

See Jason's comment below

since version 3.0.2

now working. if there are issues, provide the following in your gemfile:

gem 'authlogic', github: 'binarylogic/authlogic', ref: 'e4b2990d6282f3f7b50249b4f639631aef68b939'

Since gem version 3.6.0, see https://github.com/binarylogic/authlogic/blob/9340a93541f2fdc92c1fa569f74be9a5deed2e14/CHANGELOG.md#360-2017-04-28

Tests show that it works under rails '4.0.0.beta1'.

since gem version 3.1.5

Breadcrumble 4.0.0 is ready for Rails 4!

since commit https://github.com/ma2gedev/breadcrumble/commit/6a274b9b881d74aa69a8c3cf248fa73bacfd1d46

works

since version 5.2.0

Does not depend on rails

Does not depend on rails

Was started as a semi-official reboot of cancan (which is not yet Rails 4 ready). Work on cancan seems to have stopped, cancancan is Rails 4 ready.

since gem version 1.15.0

Does not depend on Rails

does not depended on Rails

from version 1.0.0.rc7 (source)

from version 1.13