Drop support for rails 3

In #895, Sean asked:

> .. since it looks like the next version is planned to be 6.0.0, how would
> you feel about dropping support for Rails 3 in that version? It has
> reached end of life, meaning it no longer receives security patches. We
> don't recommend that gem authors continue to support it.

To which, I responded:

> We could continue maintaining PT 5 if we had to, so I think it's
> fine to drop support for rails 3 in PT 6. If Ben agrees, I'd be
> happy to make that change. I'll just update the gemspec and drop
> testing support, for starters. We can clean up the conditionals in
> the code over time.

.github/CONTRIBUTING.md

@@ -22,17 +22,11 @@ Install gems with `bundle exec appraisal install`.
 
 Testing is a little awkward because the test suite:
 
-1. Supports three major versions of rails: 3, 4, 5
+1. Supports multiple versions of rails
 1. Contains a "dummy" rails app with three databases (test, foo, and bar)
 1. Supports three different RDBMS': sqlite, mysql, and postgres
 
-Test against rails 3:
-
-```
-bundle exec appraisal ar3 rake
-```
-
-Run tests with sqlite:
+### Run tests with sqlite
 
 ```
 # Create the appropriate database config. file
@@ -47,10 +41,10 @@ RAILS_ENV=bar bundle exec rake db:setup
 cd ../..
 
 # Run tests
-DB=sqlite bundle exec appraisal ar5 rake
+DB=sqlite bundle exec appraisal ar-5.0 rake
 ```
 
-Run tests with mysql:
+### Run tests with mysql
 
 ```
 # Create the appropriate database config. file
@@ -65,10 +59,10 @@ RAILS_ENV=bar bundle exec rake db:setup
 cd ../..
 
 # Run tests
-DB=mysql bundle exec appraisal ar5 rake
+DB=mysql bundle exec appraisal ar-5.0 rake
 ```
 
-Run tests with postgres:
+### Run tests with postgres
 
 ```
 # Create the appropriate database config. file
@@ -85,10 +79,10 @@ cd ../..
 
 # Run tests
 DB=postgres bundle exec rake
-DB=postgres bundle exec appraisal ar5 rake
+DB=postgres bundle exec appraisal ar-5.0 rake
 ```
 
-### Releases
+## Releases
 
 1. Set the version in lib/paper_trail/version_number.rb
   - Set PRE to nil unless it's a pre-release (beta, rc, etc.)

.travis.yml

@@ -25,17 +25,16 @@ before_script:
   - sh -c "if [ \"$DB\" = 'postgres' ]; then psql -c 'create database paper_trail_foo;'  -U postgres; fi"
 
 gemfile:
-  - gemfiles/ar3.gemfile
-  - gemfiles/ar4.gemfile
-  - gemfiles/ar5.gemfile
+  - gemfiles/ar_4.2.gemfile
+  - gemfiles/ar_5.0.gemfile
   - gemfiles/ar_master.gemfile
 
 matrix:
   fast_finish: true
   exclude:
-    - gemfile: gemfiles/ar5.gemfile
+    - gemfile: gemfiles/ar_5.0.gemfile
       rvm: 1.9.3
-    - gemfile: gemfiles/ar5.gemfile
+    - gemfile: gemfiles/ar_5.0.gemfile
       rvm: jruby-19mode
   allow_failures:
     - gemfile: gemfiles/ar_master.gemfile

Appraisals

@@ -7,27 +7,12 @@
 # > the version from the appraisal takes precedence.
 # > https://github.com/thoughtbot/appraisal
 
-appraise "ar3" do
-  gem "activerecord", "~> 3.2.22"
-  gem "i18n", "~> 0.6.11"
-  gem "request_store", "~> 1.1.0"
-  gem "sinatra", "~> 1.4.6"
-
-  group :development, :test do
-    gem 'railties', '~> 3.2.22'
-    gem 'test-unit', '~> 3.1.5'
-    platforms :ruby do
-      gem 'mysql2', '~> 0.3.20'
-    end
-  end
-end
-
-appraise "ar4" do
+appraise "ar-4.2" do
   gem "activerecord", "~> 4.2"
   gem "sinatra", "~> 1.4.6"
 end
 
-appraise "ar5" do
+appraise "ar-5.0" do
   gem "activerecord", "~> 5.0.0"
   gem "rspec-rails", "~> 3.5.1"
   gem 'rails-controller-testing'

CHANGELOG.md

@@ -3,14 +3,15 @@
 This project follows [semver 2.0.0](http://semver.org/spec/v2.0.0.html) and the
 recommendations of [keepachangelog.com](http://keepachangelog.com/).
 
-## Unreleased
+## 6.0.0 (Unreleased)
 
 Now with less model pollution! About 40 methods that were polluting your models'
 namespaces have been removed, reducing the chances of a name conflict with your
 methods.
 
 ### Breaking Changes
 
+- Dropped support for rails 3
 - [#864](https://github.com/airblade/paper_trail/pull/864) - The model methods
   deprecated in 5.2.0 have been removed. Use `paper_trail.x` instead of `x`.
 - [#861](https://github.com/airblade/paper_trail/pull/861) - `timestamp_field=`
@@ -23,6 +24,7 @@ methods.
 
 ### Added
 
+- Support for rails 5.1
 - [#881](https://github.com/airblade/paper_trail/pull/881) - Add RSpec matcher
   `have_a_version_with_changes` for easier testing.
 

README.md

@@ -60,14 +60,14 @@ has been destroyed.
 
 ### 1.a. Compatibility
 
-| paper_trail    | branch     | tags   | ruby     | activerecord |
-| -------------- | ---------- | ------ | -------- | ------------ |
-| 6 (unreleased) | master     |        | >= 1.9.3 | >= 3.0, < 6  |
-| 5              | 5-stable   | v5.x   | >= 1.9.3 | >= 3.0, < 6  |
-| 4              | 4-stable   | v4.x   | >= 1.8.7 | >= 3.0, < 6  |
-| 3              | 3.0-stable | v3.x   | >= 1.8.7 | >= 3.0, < 5  |
-| 2              | 2.7-stable | v2.x   | >= 1.8.7 | >= 3.0, < 4  |
-| 1              | rails2     | v1.x   | >= 1.8.7 | >= 2.3, < 3  |
+| paper_trail    | branch     | tags   | ruby     | activerecord  |
+| -------------- | ---------- | ------ | -------- | ------------- |
+| 6 (unreleased) | master     |        | >= 1.9.3 | >= 4.0, < 6   |
+| 5              | 5-stable   | v5.x   | >= 1.9.3 | >= 3.0, < 5.1 |
+| 4              | 4-stable   | v4.x   | >= 1.8.7 | >= 3.0, < 5.1 |
+| 3              | 3.0-stable | v3.x   | >= 1.8.7 | >= 3.0, < 5   |
+| 2              | 2.7-stable | v2.x   | >= 1.8.7 | >= 3.0, < 4   |
+| 1              | rails2     | v1.x   | >= 1.8.7 | >= 2.3, < 3   |
 
 ### 1.b. Installation
 

paper_trail.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   # (https://github.com/rails/rails/pull/25337) which is pretty important
   # to PT. I haven't found good instructions yet on how to upgrade, but
   # Sean Griffin described it as easy, on his podcast (http://bikeshed.fm/87).
-  s.add_dependency "activerecord", [">= 3.0", "< 5.1"]
+  s.add_dependency "activerecord", [">= 4.0", "< 5.1"]
   s.add_dependency "request_store", "~> 1.1"
 
   s.add_development_dependency "appraisal", "~> 2.1"