fix: when defining custom task on index level, keep the ones from global

Gemfile.lock

@@ -10,7 +10,7 @@ GIT
 PATH
   remote: .
   specs:
-    esse-async_indexing (0.1.0.rc3)
+    esse-async_indexing (0.1.0.rc4)
       background_job
       esse (>= 0.4.0.rc1)
       multi_json

lib/esse/async_indexing/tasks.rb

@@ -64,6 +64,12 @@ def fetch(name)
       end
       alias_method :[], :fetch
 
+      def dup
+        new_task = self.class.new
+        new_task.instance_variable_set(:@tasks, @tasks.dup)
+        new_task
+      end
+
       private
 
       def validate!(names, block)

lib/esse/async_indexing/version.rb

@@ -2,6 +2,6 @@
 
 module Esse
   module AsyncIndexing
-    VERSION = "0.1.0.rc3"
+    VERSION = "0.1.0.rc4"
   end
 end

lib/esse/plugins/async_indexing.rb

@@ -45,7 +45,7 @@ def implement_batch_ids?
         #   MyCustomJob.perform_later(repo.index.name, [id], **kwargs)
         # end
         def async_indexing_job(*operations, &block)
-          definer = @async_indexing_tasks || Esse::AsyncIndexing::Tasks.new
+          definer = @async_indexing_tasks || Esse.config.async_indexing.tasks.dup
           definer.define(*operations, &block)
           @async_indexing_tasks = definer
         end

spec/esse/async_indexing/tasks_spec.rb

@@ -85,4 +85,13 @@
     it_behaves_like "a task fetch for", :delete
     it_behaves_like "a task fetch for", :update_lazy_attribute
   end
+
+  describe "#dup" do
+    it "duplicates the tasks" do
+      import_task = ->(**) {}
+      tasks.define(:import, &import_task)
+      new_tasks = tasks.dup
+      expect(new_tasks[:import]).to eq(import_task)
+    end
+  end
 end