Feature: Discard nil value field

README.md

@@ -694,6 +694,36 @@ _NOTE:_ The field-level setting overrides the global config setting (for the fie
 
 </details>
 
+<details>
+<summary>Exclude Fields with nil Values</summary>
+
+
+By default, fields with `nil` values are included when rendering. You can override this behavior by setting `:exclude_if_nil: true` in the field definition. 
+
+Usage:
+
+```ruby
+class UserBlueprint < Blueprinter::Base
+  identifier :uuid
+
+  field :name
+  field :birthday, exclude_if_nil: true
+end
+
+user = User.new(name: 'John Doe')
+puts UserBlueprint.render(user)
+```
+
+Output:
+
+```json
+{
+  "name": "John Doe"
+}
+```
+
+</details>
+
 <details>
 <summary>Custom Formatting for Dates and Times</summary>
 

lib/blueprinter/helpers/base_helpers.rb

@@ -48,7 +48,11 @@ def object_to_hash(object, view_name:, local_options:)
         result_hash = view_collection.fields_for(view_name).each_with_object({}) do |field, hash|
           next if field.skip?(field.name, object, local_options)
 
-          hash[field.name] = field.extract(object, local_options)
+          value = field.extract(object, local_options)
+
+          next if value.nil? && field.options[:exclude_if_nil]
+
+          hash[field.name] = value
         end
         view_collection.transformers(view_name).each do |transformer|
           transformer.transform(result_hash, object, local_options)

spec/integrations/base_spec.rb

@@ -82,6 +82,30 @@
       end
     end
 
+    context 'Given exclude_if_nil is passed' do
+      let(:obj) { OpenStruct.new(obj_hash.merge(nil_attribute: nil)) }
+
+      context 'and exclude_if_nil is true' do
+        let(:blueprint) do
+          Class.new(Blueprinter::Base) do
+            field :nil_attribute, exclude_if_nil: true
+          end
+        end
+        let(:result) { '{}' }
+        it { expect(blueprint.render(obj)).to eq(result) }
+      end
+
+      context 'and exclude_if_nil is false' do
+        let(:blueprint) do
+          Class.new(Blueprinter::Base) do
+            field :nil_attribute, exclude_if_nil: false
+          end
+        end
+        let(:result) { '{"nil_attribute":null}' }
+        it { expect(blueprint.render(obj)).to eq(result) }
+      end
+    end
+
     context 'Inside Rails project' do
       include FactoryBot::Syntax::Methods
       let(:obj) { create(:user) }