Update inspect method to handle nil serializable_hash

CHANGELOG.md

@@ -7,7 +7,7 @@
 #### Fixes
 
 * Your contribution here.
-
+* [#384](https://github.com/ruby-grape/grape-entity/pull/384): Fix `inspect` to correctly handle `nil` values - [@fcce](https://github.com/fcce).
 
 ### ### 1.0.1 (2024-04-10)
 

bench/serializing.rb

@@ -35,7 +35,7 @@ class Teacher < Models::Person
     attr_accessor :tenure
 
     def initialize(opts = {})
-      super(opts)
+      super
       @tenure = opts[:tenure]
     end
   end
@@ -44,7 +44,7 @@ class Student < Models::Person
     attr_reader :grade
 
     def initialize(opts = {})
-      super(opts)
+      super
       @grade = opts[:grade]
     end
   end

grape-entity.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 3.0'
 
-  s.add_runtime_dependency 'activesupport', '>= 3.0.0'
+  s.add_dependency 'activesupport', '>= 3.0.0'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec}/*`.split("\n")

lib/grape_entity/entity.rb

@@ -472,8 +472,13 @@ def presented
 
     # Prevent default serialization of :options or :delegator.
     def inspect
-      fields = serializable_hash.map { |k, v| "#{k}=#{v}" }
-      "#<#{self.class.name}:#{object_id} #{fields.join(' ')}>"
+      object = serializable_hash
+      if object.nil?
+        "#<#{self.class.name}:#{object_id}> nil"
+      else
+        fields = object.map { |k, v| "#{k}=#{v}" }
+        "#<#{self.class.name}:#{object_id} #{fields.join(' ')}>"
+      end
     end
 
     def initialize(object, options = {})

spec/grape_entity/entity_spec.rb

@@ -1778,6 +1778,11 @@ class NoPathCharacterEntity < Grape::Entity
         expect(data).to_not include '@options'
         expect(data).to_not include '@delegator'
       end
+
+      it 'returns a nil string when subject is nil' do
+        data = subject.class.new(nil).inspect
+        expect(data).to include 'nil'
+      end
     end
 
     describe '#value_for' do