Allow global settings on Grape::Entity.

This fixes a regression introduced after merging a #134.
It's something undocumented before but it worked before and I don't see
anything harmful in the presence of this feature.

Fixes #166.

Conflicts:
	.rubocop_todo.yml
	CHANGELOG.md
	lib/grape_entity/entity.rb
	lib/grape_entity/version.rb
	spec/grape_entity/entity_spec.rb

Author: marshall-lee

.rubocop_todo.yml

@@ -1,5 +1,5 @@
 # This configuration was generated by `rubocop --auto-gen-config`
-# on 2015-08-02 19:30:25 +0300 using RuboCop version 0.31.0.
+# on 2015-08-10 13:14:22 +0300 using RuboCop version 0.31.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -12,13 +12,13 @@ Metrics/AbcSize:
 # Offense count: 2
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 198
+  Max: 202
 
 # Offense count: 3
 Metrics/CyclomaticComplexity:
   Max: 11
 
-# Offense count: 208
+# Offense count: 210
 # Configuration parameters: AllowURI, URISchemes.
 Metrics/LineLength:
   Max: 146

CHANGELOG.md

@@ -14,6 +14,10 @@
 * [#151](https://github.com/ruby-grape/grape-entity/pull/151): Fix: deep projections (`:only`, `:except`) were unaware of nesting: [#156](https://github.com/ruby-grape/grape-entity/issues/156) - [@marshall-lee](https://github.com/marshall-lee).
 * Your contribution here.
 
+0.4.8 (2015-08-10)
+==================
+* [#167](https://github.com/ruby-grape/grape-entity/pull/167): Regression: global settings (exposures, formatters) on `Grape::Entity` should work: [#166](https://github.com/ruby-grape/grape-entity/issues/166) - [@marshall-lee](http://github.com/marshall-lee).
+
 0.4.7 (2015-08-03)
 ==================
 * [#164](https://github.com/ruby-grape/grape-entity/pull/164): Regression: entity instance methods were exposed with `NoMethodError`: [#163](https://github.com/ruby-grape/grape-entity/issues/163) - [@marshall-lee](http://github.com/marshall-lee).

lib/grape_entity/entity.rb

@@ -99,15 +99,26 @@ def entity(options = {})
     end
 
     class << self
-      attr_accessor :root_exposure
+      def root_exposure
+        @root_exposure ||= Exposure.new(nil, nesting: true)
+      end
+
+      attr_writer :root_exposure
+
       # Returns all formatters that are registered for this and it's ancestors
       # @return [Hash] of formatters
-      attr_accessor :formatters
+      def formatters
+        @formatters ||= {}
+      end
+
+      attr_writer :formatters
     end
 
+    @formatters = {}
+
     def self.inherited(subclass)
-      subclass.root_exposure = root_exposure.try(:dup) || build_root_exposure
-      subclass.formatters = formatters.try(:dup) || {}
+      subclass.root_exposure = root_exposure.dup
+      subclass.formatters = formatters.dup
     end
 
     # This method is the primary means by which you will declare what attributes
@@ -175,10 +186,6 @@ def self.expose(*args, &block)
       end
     end
 
-    def self.build_root_exposure
-      Exposure.new(nil, nesting: true)
-    end
-
     # Returns exposures that have been declared for this Entity on the top level.
     # @return [Array] of exposures
     def self.root_exposures

spec/grape_entity/entity_spec.rb

@@ -322,6 +322,26 @@ class Parent < Person
           subject.expose(:size, format_with: :size_formatter)
           expect(subject.represent(object).value_for(:size)).to eq object.class.to_s
         end
+
+        it 'works global on Grape::Entity' do
+          Grape::Entity.format_with :size_formatter do |_date|
+            self.object.class.to_s
+          end
+          object = {}
+
+          subject.expose(:size, format_with: :size_formatter)
+          expect(subject.represent(object).value_for(:size)).to eq object.class.to_s
+        end
+      end
+
+      it 'works global on Grape::Entity' do
+        Grape::Entity.expose :x
+        object = { x: 11, y: 22 }
+        expect(Grape::Entity.represent(object).value_for(:x)).to eq 11
+        subject.expose :y
+        expect(subject.represent(object).value_for(:x)).to eq 11
+        expect(subject.represent(object).value_for(:y)).to eq 22
+        Grape::Entity.unexpose :x
       end
     end
 
@@ -370,6 +390,13 @@ class Parent < Person
           end
         end.to raise_error(/You cannot call 'unexpose`/)
       end
+
+      it 'works global on Grape::Entity' do
+        Grape::Entity.expose :x
+        expect(Grape::Entity.root_exposures[0].attribute).to eq(:x)
+        Grape::Entity.unexpose :x
+        expect(Grape::Entity.root_exposures).to eq([])
+      end
     end
 
     describe '.with_options' do