Add gem configuration, with base component customization

app/components/view_component/form/base_component.rb

@@ -2,7 +2,7 @@
 
 module ViewComponent
   module Form
-    class BaseComponent < ViewComponent::Base
+    class BaseComponent < ViewComponent::Form.configuration.parent_component.constantize
       class << self
         attr_accessor :default_options
       end

lib/view_component/form.rb

@@ -1,10 +1,20 @@
 # frozen_string_literal: true
 
 require "view_component"
+require_relative "form/configuration"
 require "zeitwerk"
 
 module ViewComponent
   module Form
+    class << self
+      def configuration
+        @configuration ||= Configuration.new
+      end
+
+      def configure
+        yield configuration
+      end
+    end
   end
 end
 

lib/view_component/form/configuration.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module ViewComponent
+  module Form
+    class Configuration
+      attr_accessor :parent_component
+
+      def initialize
+        @parent_component = "ViewComponent::Base"
+      end
+    end
+  end
+end

spec/internal/app/components/application_form_component.rb

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+class ApplicationFormComponent < ViewComponent::Base
+end

spec/internal/config/initializers/view_component_form.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+ViewComponent::Form.configure do |config|
+  config.parent_component = "ApplicationFormComponent"
+end

spec/view_component/form/base_component_spec.rb

@@ -46,4 +46,12 @@ def name
       it { expect(component.object_errors?).to be(false) }
     end
   end
+
+  describe "parent_component" do
+    subject { described_class }
+
+    context "without configured parent_component" do
+      it { is_expected.to be < ViewComponent::Base }
+    end
+  end
 end

spec/view_component/form/builder_spec.rb

@@ -192,4 +192,12 @@
       it { expect(builder.send(:validation_context)).to eq(:create) }
     end
   end
+
+  describe "base component parent" do
+    subject(:field) { described_class.new(object_name, object, template, options).send(:component_klass, :text_field) }
+
+    it "is configured via initializer" do
+      expect(field.ancestors).to include(ApplicationFormComponent)
+    end
+  end
 end

spec/view_component/form/configuration_spec.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+RSpec.describe ViewComponent::Form::Configuration do
+  subject(:configuration) { described_class.new }
+
+  describe "defaults" do
+    it do
+      expect(configuration).to have_attributes(parent_component: "ViewComponent::Base")
+    end
+  end
+end

spec/view_component/form_spec.rb

@@ -5,6 +5,10 @@
     expect(ViewComponent::Form::VERSION).not_to be_nil
   end
 
+  it "is configurable" do
+    expect { |block| described_class.configure(&block) }.to yield_with_args(ViewComponent::Form::Configuration)
+  end
+
   if ENV.fetch("VIEW_COMPONENT_FORM_USE_ACTIONTEXT", "false") == "true"
     it "loads ActionText" do
       expect(defined?(ActionView::Helpers::Tags::ActionText)).to eq("constant")