rubocop fixes

Author: loiswells97

app/controllers/api/lessons_controller.rb

@@ -11,14 +11,7 @@ def index
       scope = params[:school_class_id] ? archive_scope.where(school_class_id: params[:school_class_id]) : archive_scope
       ordered_scope = scope.order(created_at: :asc)
       lessons_with_users = ordered_scope.accessible_by(current_ability).with_users
-      remixes = ordered_scope.map do |lesson|
-        next nil unless lesson&.project&.remixes.any?
-        lesson.project&.remixes
-              .where(user_id: current_user.id)
-              .accessible_by(current_ability)
-              .order(created_at: :asc)
-              .first
-      end
+      remixes = user_remixes(ordered_scope)
       @lessons_with_users_and_remixes = lessons_with_users.zip(remixes)
       render :index, formats: [:json], status: :ok
     end
@@ -83,6 +76,22 @@ def verify_school_class_belongs_to_school
       raise ParameterError, 'school_class_id does not correspond to school_id'
     end
 
+    def user_remixes(lessons)
+      lessons.map do |lesson|
+        next nil unless lesson&.project&.remixes&.any?
+
+        user_remix(lesson)
+      end
+    end
+
+    def user_remix(lesson)
+      lesson.project&.remixes
+            &.where(user_id: current_user.id)
+            &.accessible_by(current_ability)
+            &.order(created_at: :asc)
+            &.first
+    end
+
     def lesson_params
       base_params.merge(user_id: current_user.id)
     end