Sets up initial gem to patch shoulda-matchers

Since we're taking advantage of storing UUIDs in MySQL as `binary`, the shoulda-matchers has an issue when the UUID ends in an `f`.  This has lead to some flakey tests.  [We made an effort to fix this upstream](thoughtbot/shoulda-matchers#1159), which doesn't appear to be gaining traction.  This extracts the fix into a gem so we don't have to support a hard fork for this.

Pivotal Story: https://www.pivotaltracker.com/story/show/164603806
Merges #1
LGTM given by: @bsimpson

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/**/database.yml
+/spec/reports/
+/tmp/
+Gemfile.lock
+
+# rspec failure tracking
+.rspec_status

.rspec

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+--format documentation
+--color
+--require spec_helper

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at [https://contributor-covenant.org/version/1/4][version]
+
+[homepage]: https://contributor-covenant.org
+[version]: https://contributor-covenant.org/version/1/4/

Gemfile

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+source "https://rubygems.org"
+
+# Specify your gem's dependencies in shoulda-matchers-uuid.gemspec
+gemspec
+
+gem "activemodel", "> 5.0"
+gem "activerecord", "> 4"
+gem "byebug"
+gem "mysql2"
+gem "mysql-binuuid-rails", require: false
+gem "rake", "~> 12.0"
+gem "rspec", "~> 3.0"

LICENSE.txt

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+Copyright 2016 Doximity, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

README.md

@@ -1,2 +1,40 @@
 # shoulda-matchers-uuid
-The shoulda-matchers gem does not currently support MYSQL uuid columns.  This extends it to allow validating uuids in models.
+
+This is a patch to shoulda-matchers that allows the uniqueness validation matchers to work with MySQL UUIDs.  The current shoulda-matchers gem incorrectly increments UUID values when they are set as `binary` types (when using the [mysql-binuuid-rails gem](https://github.com/nedap/mysql-binuuid-rails)).
+
+We have [an existing open PR](https://github.com/thoughtbot/shoulda-matchers/pull/1159) that is likely not going to make it through.
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'shoulda-matchers-uuid'
+```
+
+And then execute:
+
+    $ bundle install
+
+Or install it yourself as:
+
+    $ gem install shoulda-matchers-uuid
+
+## Usage
+
+That's it!  Use shoulda-matchers as usual to validate uniqueness of UUIDs.
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/codenamev/shoulda-matchers-uuid. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/codenamev/shoulda-matchers-uuid/blob/master/CODE_OF_CONDUCT.md).
+
+
+## Code of Conduct
+
+Everyone interacting in the Shoulda::Matchers::Uuid project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/codenamev/shoulda-matchers-uuid/blob/master/CODE_OF_CONDUCT.md).

Rakefile

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+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec

bin/console

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+#!/usr/bin/env ruby
+
+require "bundler/setup"
+require "shoulda/matchers/uuid"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+# (If you use this, don't forget to add pry to your Gemfile!)
+# require "pry"
+# Pry.start
+
+require "irb"
+IRB.start(__FILE__)

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+cp ./spec/support/database.yml.example ./spec/support/database.yml

lib/shoulda/matchers/uuid.rb

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+# frozen_string_literal: true
+
+require "active_support/concern"
+require "shoulda/matchers"
+
+module ShouldaMatchersMysqlUuidFix
+  extend ActiveSupport::Concern
+
+  included do
+    def next_scalar_value_for(scope, previous_value)
+      if uuid?(scope)
+        SecureRandom.uuid
+      elsif defined_as_enum?(scope)
+        available_values = available_enum_values_for(scope, previous_value)
+        available_values.keys.last
+      elsif polymorphic_type_attribute?(scope, previous_value)
+        Uniqueness::TestModels.create(previous_value).to_s
+      elsif previous_value.respond_to?(:next)
+        previous_value.next
+      elsif previous_value.respond_to?(:to_datetime)
+        previous_value.to_datetime.next
+      elsif boolean_value?(previous_value)
+        !previous_value
+      else
+        previous_value.to_s.next
+      end
+    end
+
+    def uuid?(scope)
+      [
+        column_for(scope),
+        attribute_type_for(scope)
+      ].compact.map(&:type).include? :uuid
+    end
+
+    def attribute_type_for(scope)
+      return unless model.respond_to?(:attribute_types)
+
+      model.attribute_types[scope.to_s]
+    end
+  end
+end
+
+Shoulda::Matchers::ActiveRecord::ValidateUniquenessOfMatcher.public_send(:include, ShouldaMatchersMysqlUuidFix)

lib/shoulda/matchers/uuid/version.rb

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+module Shoulda
+  module Matchers
+    module Uuid
+      VERSION = "0.1.0"
+    end
+  end
+end

shoulda-matchers-uuid.gemspec

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+require_relative 'lib/shoulda/matchers/uuid/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "shoulda-matchers-uuid"
+  spec.version       = Shoulda::Matchers::Uuid::VERSION
+  spec.authors       = ["Valentino Stoll", "Ben Simpson"]
+  spec.email         = ["[email protected]", "[email protected]"]
+
+  spec.summary       = %q{Adds support for MYSQL uuids in shoulda-matchers context}
+  spec.description   = %q{shoulda-matchers does not currently support MYSQL uuid columns.  This extends it to allow validating uuids in models.}
+  spec.homepage      = "https://github.com/doximity/shoulda-matchers-uuid"
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = "https://github.com/doximity/shoulda-matchers-uuid"
+  spec.metadata["changelog_uri"] = "https://github.com/doximity/shoulda-matchers-uuid/blob/master/CHANGELOG.md"
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  spec.add_dependency("shoulda-matchers")
+end

spec/shoulda/matchers/uuid_spec.rb

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+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe Shoulda::Matchers::Uuid do
+  it "has a version number" do
+    expect(Shoulda::Matchers::Uuid::VERSION).not_to be nil
+  end
+end

spec/spec_helper.rb

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+# frozen_string_literal: true
+
+require "bundler/setup"
+require "rspec"
+require "rspec/core/profiler"
+require "shoulda/matchers/uuid"
+
+RSpec.configure do |config|
+  # Enable flags like --only-failures and --next-failure
+  config.example_status_persistence_file_path = ".rspec_status"
+
+  # Disable RSpec exposing methods globally on `Module` and `main`
+  config.disable_monkey_patching!
+
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+end

spec/support/database.yml.example

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+# MySQL. Versions 5.1.10 and up are supported.
+#
+# Install the MySQL driver
+#   gem install mysql2
+#
+# Ensure the MySQL gem is defined in your Gemfile
+#   gem 'mysql2'
+#
+# And be sure to use new-style password hashing:
+#   http://dev.mysql.com/doc/refman/5.7/en/old-client.html
+#
+adapter: mysql2
+encoding: utf8mb4
+charset: utf8mb4
+collation: utf8mb4_unicode_ci
+database: shoulda_matchers_uuid_test
+host: localhost
+port: 3306
+username: root
+password:

spec/support/example_app_helpers.rb

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+# frozen_string_literal: true
+
+require "bundler/inline"
+
+require "active_record"
+require "mysql-binuuid-rails"
+require "yaml"
+
+module ExampleAppHelpers
+  def setup_example_app(initial_migration_klass)
+    establish_database_connection
+    perform_migration(initial_migration_klass)
+  end
+
+  def teardown_example_app
+    ActiveRecord::Base.connection.execute("DROP DATABASE IF EXISTS #{database_configuration["database"]}")
+  end
+
+  def establish_database_connection
+    ActiveRecord::Base.logger = ActiveSupport::Logger.new(STDOUT)
+    ActiveRecord::Base.establish_connection(database_configuration.except("database"))
+    ActiveRecord::Base.connection.execute("CREATE DATABASE IF NOT EXISTS #{database_configuration["database"]}")
+    ActiveRecord::Base.establish_connection(database_configuration)
+  end
+
+  def perform_migration(migration_klass)
+    migration_klass.migrate(:up)
+  end
+
+  def database_configuration
+    return @database_configuration if defined? @database_configuration
+
+    db_config_file = File.open(File.expand_path(File.join(Dir.pwd, "spec", "support", "database.yml")))
+    @database_configuration = YAML.safe_load(db_config_file)
+  end
+end