add hash slice using IndifferentAccess

.rubocop.yml

@@ -15,6 +15,9 @@ Layout/IndentHeredoc:
 Metrics/ClassLength:
   Enabled: false
 
+Metrics/ModuleLength:
+  Enabled: false
+
 Metrics/BlockLength:
   Exclude:
     - 'spec/**/*.rb'

.rubocop_todo.yml

@@ -1,16 +1,16 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-10-10 00:07:29 -0400 using RuboCop version 0.52.1.
+# on 2020-10-02 23:12:27 -0300 using RuboCop version 0.52.1.
 # 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
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 7
+# Offense count: 9
 Metrics/AbcSize:
   Max: 23
 
-# Offense count: 7
+# Offense count: 8
 Metrics/CyclomaticComplexity:
   Max: 11
 
@@ -19,10 +19,10 @@ Metrics/CyclomaticComplexity:
 Metrics/MethodLength:
   Max: 28
 
-# Offense count: 5
+# Offense count: 6
 Metrics/PerceivedComplexity:
   Max: 10
 
-# Offense count: 41
+# Offense count: 44
 Style/Documentation:
   Enabled: false

CHANGELOG.md

@@ -36,6 +36,7 @@ Any violations of this scheme are considered to be bugs.
 ### Fixed
 
 * [#516](https://github.com/hashie/hashie/issues/516): Fixed `NoMethodError` raised when including `Hashie::Extensions::Mash::SymbolizeKeys` and `Hashie::Extensions::SymbolizeKeys` in mashes/hashes with non string or symbol keys - [@carolineartz](https://github.com/carolineartz).
+* [#531](https://github.com/hashie/hashie/pull/531): Fixed [slice doesn't work using symbols](https://github.com/hashie/hashie/issues/529) using hash with `IndifferentAccess` extension - [@gnomex](https://github.com/gnomex)
 * Your contribution here.
 
 ### Security

lib/hashie/extensions/indifferent_access.rb

@@ -23,6 +23,8 @@ module Extensions
     #   h['baz'] # => 'blip'
     #
     module IndifferentAccess
+      include Hashie::Extensions::RubyVersionCheck
+
       def self.included(base)
         Hashie::Extensions::Dash::IndifferentAccess.maybe_extend(base)
 
@@ -141,6 +143,13 @@ def merge!(*)
         super.convert!
       end
 
+      with_minimum_ruby('2.5.0') do
+        def slice(*keys)
+          string_keys = keys.map { |key| convert_key(key) }
+          super(*string_keys)
+        end
+      end
+
       protected
 
       def hash_lacking_indifference?(other)

spec/hashie/extensions/indifferent_access_spec.rb

@@ -315,6 +315,18 @@ def indifferent_writer(key, value)
         end
       end
     end
+
+    with_minimum_ruby('2.5.0') do
+      describe '#slice' do
+        let(:h) { subject.build(foo: 'bar', baz: 'qux') }
+
+        it 'indifferently slices the hash' do
+          sliced_h = { 'foo' => 'bar' }
+          expect(h.slice('foo')).to eq sliced_h
+          expect(h.slice(:foo)).to eq sliced_h
+        end
+      end
+    end
   end
 
   describe 'with merge initializer' do