add rubocop and fix single quotes interpolation

.rubocop.yml

@@ -0,0 +1,14 @@
+Metrics/LineLength:
+  Max: 120
+
+Style/Documentation:
+  Enabled: false
+
+Style/NonNilCheck:
+  IncludeSemanticChanges: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+AllCops:
+  TargetRubyVersion: 2.0

Gemfile

@@ -1,3 +1,3 @@
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
 gemspec

Rakefile

@@ -1,7 +1,7 @@
-require "bundler/gem_tasks"
+require 'bundler/gem_tasks'
 require 'rspec/core/rake_task'
 
-desc "Run RSpec"
+desc 'Run RSpec'
 RSpec::Core::RakeTask.new do |t|
   t.verbose = false
 end

cancancan.gemspec

@@ -4,22 +4,22 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'cancan/version'
 
 Gem::Specification.new do |s|
-  s.name        = "cancancan"
+  s.name        = 'cancancan'
   s.version     = CanCan::VERSION
-  s.authors     = ["Bryan Rite", "Ryan Bates", "Richard Wilson"]
-  s.email       = "r.crawfordwilson@gmail.com"
-  s.homepage    = "https://github.com/CanCanCommunity/cancancan"
-  s.summary     = "Simple authorization solution for Rails."
-  s.description = "Continuation of the simple authorization solution for Rails which is decoupled from user roles. All permissions are stored in a single location."
+  s.authors     = ['Bryan Rite', 'Ryan Bates', 'Richard Wilson']
+  s.email       = 'r.crawfordwilson@gmail.com'
+  s.homepage    = 'https://github.com/CanCanCommunity/cancancan'
+  s.summary     = 'Simple authorization solution for Rails.'
+  s.description = 'Continuation of the simple authorization solution for Rails which is decoupled from user roles. All permissions are stored in a single location.'
   s.platform    = Gem::Platform::RUBY
-  s.license     = "MIT"
+  s.license     = 'MIT'
 
   s.files       = `git ls-files`.split($/)
   s.test_files  = `git ls-files -- Appraisals {spec,features,gemfiles}/*`.split($/)
   s.executables = `git ls-files -- bin/*`.split($/).map{ |f| File.basename(f) }
-  s.require_paths = ["lib"]
+  s.require_paths = ['lib']
 
-  s.required_ruby_version = ">= 2.0.0"
+  s.required_ruby_version = '>= 2.0.0'
 
   s.add_development_dependency 'bundler', '~> 1.3'
   s.add_development_dependency 'rake', '~> 10.1.1'

lib/cancan.rb

@@ -1,4 +1,4 @@
-require "cancan/version"
+require 'cancan/version'
 require 'cancan/ability'
 require 'cancan/rule'
 require 'cancan/controller_resource'
@@ -13,7 +13,7 @@
 if defined? ActiveRecord
   require 'cancan/model_adapters/active_record_adapter'
   if ActiveRecord.respond_to?(:version) &&
-      ActiveRecord.version >= Gem::Version.new("4")
+      ActiveRecord.version >= Gem::Version.new('4')
     require 'cancan/model_adapters/active_record_4_adapter'
   else
     require 'cancan/model_adapters/active_record_3_adapter'

lib/cancan/ability.rb

@@ -222,7 +222,7 @@ def unauthorized_message(action, subject)
       keys = unauthorized_message_keys(action, subject)
       variables = {:action => action.to_s}
       variables[:subject] = (subject.class == Class ? subject : subject.class).to_s.underscore.humanize.downcase
-      message = I18n.translate(nil, variables.merge(:scope => :unauthorized, :default => keys + [""]))
+      message = I18n.translate(nil, variables.merge(:scope => :unauthorized, :default => keys + ['']))
       message.blank? ? nil : message
     end
 

lib/cancan/controller_additions.rb

@@ -254,13 +254,13 @@ def skip_authorize_resource(*args)
       #     check_authorization :unless => :devise_controller?
       #
       def check_authorization(options = {})
-        method_name = ActiveSupport.respond_to?(:version) && ActiveSupport.version >= Gem::Version.new("4") ? :after_action : :after_filter
+        method_name = ActiveSupport.respond_to?(:version) && ActiveSupport.version >= Gem::Version.new('4') ? :after_action : :after_filter
 
         block = Proc.new do |controller|
           next if controller.instance_variable_defined?(:@_authorized)
           next if options[:if] && !controller.send(options[:if])
           next if options[:unless] && controller.send(options[:unless])
-          raise AuthorizationNotPerformed, "This action failed the check_authorization because it does not authorize_resource. Add skip_authorization_check to bypass this check."
+          raise AuthorizationNotPerformed, 'This action failed the check_authorization because it does not authorize_resource. Add skip_authorization_check to bypass this check.'
         end
 
         self.send(method_name, options.slice(:only, :except), &block)
@@ -274,17 +274,17 @@ def check_authorization(options = {})
       #
       # Any arguments are passed to the +before_action+ it triggers.
       def skip_authorization_check(*args)
-        method_name = ActiveSupport.respond_to?(:version) && ActiveSupport.version >= Gem::Version.new("4") ? :before_action : :before_filter
+        method_name = ActiveSupport.respond_to?(:version) && ActiveSupport.version >= Gem::Version.new('4') ? :before_action : :before_filter
         block = Proc.new{ |controller| controller.instance_variable_set(:@_authorized, true) }
         self.send(method_name, *args, &block)
       end
 
       def skip_authorization(*args)
-        raise ImplementationRemoved, "The CanCan skip_authorization method has been renamed to skip_authorization_check. Please update your code."
+        raise ImplementationRemoved, 'The CanCan skip_authorization method has been renamed to skip_authorization_check. Please update your code.'
       end
 
       def cancan_resource_class
-        if ancestors.map(&:to_s).include? "InheritedResources::Actions"
+        if ancestors.map(&:to_s).include? 'InheritedResources::Actions'
           InheritedResource
         else
           ControllerResource
@@ -343,7 +343,7 @@ def authorize!(*args)
     end
 
     def unauthorized!(message = nil)
-      raise ImplementationRemoved, "The unauthorized! method has been removed from CanCan, use authorize! instead."
+      raise ImplementationRemoved, 'The unauthorized! method has been removed from CanCan, use authorize! instead.'
     end
 
     # Creates and returns the current user's ability and caches it. If you

lib/cancan/controller_resource.rb

@@ -12,7 +12,7 @@ def self.add_before_action(controller_class, method, *args)
     end
 
     def self.before_callback_name(options)
-      if ActiveSupport.respond_to?(:version) && ActiveSupport.version >= Gem::Version.new("4")
+      if ActiveSupport.respond_to?(:version) && ActiveSupport.version >= Gem::Version.new('4')
         options.delete(:prepend) ? :prepend_before_action : :before_action
       else
         options.delete(:prepend) ? :prepend_before_filter : :before_filter
@@ -24,9 +24,9 @@ def initialize(controller, *args)
       @params = controller.params
       @options = args.extract_options!
       @name = args.first
-      raise CanCan::ImplementationRemoved, "The :nested option is no longer supported, instead use :through with separate load/authorize call." if @options[:nested]
-      raise CanCan::ImplementationRemoved, "The :name option is no longer supported, instead pass the name as the first argument." if @options[:name]
-      raise CanCan::ImplementationRemoved, "The :resource option has been renamed back to :class, use false if no class." if @options[:resource]
+      raise CanCan::ImplementationRemoved, 'The :nested option is no longer supported, instead use :through with separate load/authorize call.' if @options[:nested]
+      raise CanCan::ImplementationRemoved, 'The :name option is no longer supported, instead pass the name as the first argument.' if @options[:name]
+      raise CanCan::ImplementationRemoved, 'The :resource option has been renamed back to :class, use false if no class.' if @options[:resource]
     end
 
     def load_and_authorize_resource
@@ -110,8 +110,8 @@ def find_resource
         if @options[:find_by]
           if resource_base.respond_to? "find_by_#{@options[:find_by]}!"
             resource_base.send("find_by_#{@options[:find_by]}!", id_param)
-          elsif resource_base.respond_to? "find_by"
-            resource_base.send("find_by", { @options[:find_by].to_sym => id_param })
+          elsif resource_base.respond_to? 'find_by'
+            resource_base.send('find_by', { @options[:find_by].to_sym => id_param })
           else
             resource_base.send(@options[:find_by], id_param)
           end

lib/cancan/exceptions.rb

@@ -40,7 +40,7 @@ def initialize(message = nil, action = nil, subject = nil)
       @message = message
       @action = action
       @subject = subject
-      @default_message = I18n.t(:"unauthorized.default", :default => "You are not authorized to access this page.")
+      @default_message = I18n.t(:"unauthorized.default", :default => 'You are not authorized to access this page.')
     end
 
     def to_s

lib/cancan/model_adapters/abstract_adapter.rb

@@ -28,7 +28,7 @@ def self.override_conditions_hash_matching?(subject, conditions)
 
       # Override if override_conditions_hash_matching? returns true
       def self.matches_conditions_hash?(subject, conditions)
-        raise NotImplemented, "This model adapter does not support matching on a conditions hash."
+        raise NotImplemented, 'This model adapter does not support matching on a conditions hash.'
       end
 
       # Used to determine if this model adapter will override the matching behavior for a specific condition.
@@ -39,7 +39,7 @@ def self.override_condition_matching?(subject, name, value)
 
       # Override if override_condition_matching? returns true
       def self.matches_condition?(subject, name, value)
-        raise NotImplemented, "This model adapter does not support matching on a specific condition."
+        raise NotImplemented, 'This model adapter does not support matching on a specific condition.'
       end
 
       def initialize(model_class, rules)
@@ -49,7 +49,7 @@ def initialize(model_class, rules)
 
       def database_records
         # This should be overridden in a subclass to return records which match @rules
-        raise NotImplemented, "This model adapter does not support fetching records from the database."
+        raise NotImplemented, 'This model adapter does not support fetching records from the database.'
       end
     end
   end

lib/cancan/model_adapters/mongoid_adapter.rb

@@ -59,7 +59,7 @@ def simplify_relations model_class, conditions
               v = simplify_relations(relation_class_name.constantize, v)
               relation_ids = relation_class_name.constantize.where(v).only(:id).map(&:id)
               k = "#{k}_id"
-              v = { "$in" => relation_ids }
+              v = { '$in' => relation_ids }
             end
             [k,v]
           }

lib/cancan/version.rb

@@ -1,3 +1,3 @@
 module CanCan
-  VERSION = "1.15.0"
+  VERSION = '1.15.0'
 end

lib/generators/cancan/ability/ability_generator.rb

@@ -4,7 +4,7 @@ class AbilityGenerator < Rails::Generators::Base
       source_root File.expand_path('../templates', __FILE__)
 
       def generate_ability
-        copy_file "ability.rb", "app/models/ability.rb"
+        copy_file 'ability.rb', 'app/models/ability.rb'
       end
     end
   end