Add helper for accessing lfs_objects for project

This makes accessing LFS Objects for a project easier

  project.lfs_storage_project.lfs_objects`

becomes

  project.all_lfs_objects

This will make the refactor in
https://gitlab.com/gitlab-org/gitlab-ce/issues/39769 easier to deal
with.

app/controllers/projects/lfs_api_controller.rb

@@ -41,7 +41,7 @@ class Projects::LfsApiController < Projects::GitHttpClientController
 
   def existing_oids
     @existing_oids ||= begin
-      storage_project.lfs_objects.where(oid: objects.map { |o| o['oid'].to_s }).pluck(:oid)
+      project.all_lfs_objects.where(oid: objects.map { |o| o['oid'].to_s }).pluck(:oid)
     end
   end
 

app/models/project.rb

@@ -1066,6 +1066,16 @@ class Project < ActiveRecord::Base
     end
   end
 
+  # This will return all `lfs_objects` that are accessible to the project.
+  # So this might be `self.lfs_objects` if the project is not part of a fork
+  # network, or it is the base of the fork network.
+  #
+  # TODO: refactor this to get the correct lfs objects when implementing
+  #       https://gitlab.com/gitlab-org/gitlab-ce/issues/39769
+  def all_lfs_objects
+    lfs_storage_project.lfs_objects
+  end
+
   def personal?
     !group
   end

lib/gitlab/checks/lfs_integrity.rb

@@ -15,8 +15,7 @@ module Gitlab
 
         return false unless new_lfs_pointers.present?
 
-        existing_count = @project.lfs_storage_project
-                                 .lfs_objects
+        existing_count = @project.all_lfs_objects
                                  .where(oid: new_lfs_pointers.map(&:lfs_oid))
                                  .count
 

lib/gitlab/import_export/lfs_restorer.rb

@@ -28,7 +28,7 @@ module Gitlab
         lfs_object = LfsObject.find_or_initialize_by(oid: oid, size: size)
         lfs_object.file = File.open(path) unless lfs_object.file&.exists?
 
-        @project.lfs_storage_project.lfs_objects << lfs_object
+        @project.all_lfs_objects << lfs_object
       end
 
       def lfs_file_paths

lib/gitlab/import_export/lfs_saver.rb

@@ -9,9 +9,7 @@ module Gitlab
       end
 
       def save
-        return true if @project.lfs_objects.empty?
-
-        @project.lfs_storage_project.lfs_objects.each do |lfs_object|
+        @project.all_lfs_objects.each do |lfs_object|
           save_lfs_object(lfs_object)
         end
 

spec/models/project_spec.rb

@@ -2022,6 +2022,22 @@ describe Project do
         expect(forked_project.lfs_storage_project).to eq forked_project
       end
     end
+
+    describe '#all_lfs_objects' do
+      let(:lfs_object) { create(:lfs_object) }
+
+      before do
+        project.lfs_objects << lfs_object
+      end
+
+      it 'returns the lfs object for a project' do
+        expect(project.all_lfs_objects).to contain_exactly(lfs_object)
+      end
+
+      it 'returns the lfs object for a fork' do
+        expect(forked_project.all_lfs_objects).to contain_exactly(lfs_object)
+      end
+    end
   end
 
   describe '#pushes_since_gc' do