Fix error in image decorator with variant

app/solidus_decorators/spree/image_decorator.rb

@@ -9,7 +9,7 @@ def mailchimp_sync
         SolidusMailchimpSync::ProductSynchronizer.new(self.viewable.product).auto_sync(force: true)
       else
         # image just on this variant, just need to sync this one.
-        SolidusMailchimpSync::VariantSynchronizer.new(self.variant).auto_sync(force: true)
+        SolidusMailchimpSync::VariantSynchronizer.new(self.viewable).auto_sync(force: true)
       end
     end
   end

lib/solidus_mailchimp_sync/factories.rb

@@ -1,12 +1,12 @@
-FactoryGirl.define do
+FactoryBot.define do
   # Define your Spree extensions Factories within this file to enable applications, and other extensions to use and override them.
   #
   # Example adding this to your spec_helper will load these Factories for use:
   # require 'solidus_mailchimp_sync/factories'
 end
 
 
-FactoryGirl.modify do
+FactoryBot.modify do
   factory :order do
     factory :order_with_line_items do
       # This custom factory is from Solidus master at:

solidus_mailchimp_sync.gemspec

@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'coffee-rails', '~> 4.2'
   s.add_development_dependency 'sass-rails', '~> 5.0'
   s.add_development_dependency 'database_cleaner', '~> 1.5'
-  s.add_development_dependency 'factory_girl', '~> 4.7'
+  s.add_development_dependency 'factory_bot', '~> 4.11'
   s.add_development_dependency 'rspec-rails', '~> 3.5'
   s.add_development_dependency 'rubocop', '~> 0.44'
   s.add_development_dependency 'rubocop-rspec', '~> 1.8'

spec/spec_helper.rb

@@ -17,7 +17,6 @@
 
 require 'rspec/rails'
 require 'database_cleaner'
-require 'ffaker'
 
 # Requires supporting ruby files with custom matchers and macros, etc,
 # in spec/support/ and its subdirectories.
@@ -58,7 +57,7 @@
 end
 
 RSpec.configure do |config|
-  config.include FactoryGirl::Syntax::Methods
+  config.include FactoryBot::Syntax::Methods
 
   # Infer an example group's spec type from the file location.
   config.infer_spec_type_from_file_location!