Fix behaviour when params are falsey, making their value nil instead of the original falsey value

Author: Intrepidd

lib/hyper_active_form/base.rb

@@ -55,7 +55,11 @@ def assign_form_attributes(params)
         params = ActionController::Parameters.new(params) unless params.is_a?(ActionController::Parameters)
         attribute_names.each do |attribute|
           default_value = self.class._default_attributes[attribute]&.value_before_type_cast
-          public_send(:"#{attribute}=", params&.dig(attribute) || default_value)
+          if params&.key?(attribute)
+          public_send(:"#{attribute}=", params&.dig(attribute))
+          else
+            public_send(:"#{attribute}=", default_value)
+          end
         end
         @assigned_attribute_names = params.slice(*attribute_names).keys
       end

spec/hyper_active_form/base_spec.rb

@@ -13,6 +13,7 @@ def self.model_name
       attribute :name
       attribute :age
       attribute :hobbies, default: []
+      attribute :likes_cats, :boolean
 
       def self.model_name
         ActiveModel::Name.new(self, nil, "Dummy")
@@ -29,7 +30,7 @@ def setup(name:, age:, perform_return_value: true, callable: nil)
       end
 
       def perform
-        @callable&.call
+        @callable&.call(attributes)
         @perform_return_value
       end
     end
@@ -63,7 +64,7 @@ def perform
     context "when the form is valid" do
       it "returns true and performs the form" do
         form = dummy_class.new(name: "John", age: 20, callable:)
-        expect(callable).to receive(:call)
+        expect(callable).to receive(:call).with({"name" => "Fred", "age" => 19, "hobbies" => [], "likes_cats" => nil})
         expect(form.submit(name: "Fred", age: 19)).to eq(true)
       end
 
@@ -73,6 +74,14 @@ def perform
         form.submit(name: "Fred", age: 19)
       end
 
+      context "with falsey parameters" do
+        it "assigns the attributes correctly" do
+          form = dummy_class.new(name: "John", age: 20, callable:)
+          expect(callable).to receive(:call).with({"name" => "Fred", "age" => 19, "hobbies" => [], "likes_cats" => false})
+          form.submit(name: "Fred", age: 19, likes_cats: false)
+        end
+      end
+
     end
 
     context "when the form is invalid" do