Remove the `ForkedProjectLink` model

This removes the `ForkedProjectLink` model that has been replaced by
the `ForkNetworkMember` and `ForkNetwork` combination. All existing
relations have been adjusted to use these new models.

The `forked_project_link` table has been dropped.

The "Forks" count on the admin dashboard has been updated to count all
`ForkNetworkMember` rows and deduct the number of `ForkNetwork`
rows. This is because now the "root-project" of a fork network also
has a `ForkNetworkMember` row. This count could become inaccurate when
the root of a fork network is deleted.

1 files changed, 2 insertions, 19 deletions

diff --git a/app/services/projects/create_service.rb b/app/services/projects/create_service.rb
index 0e6a7e8da54..20bfe5af7a1 100644
--- a/app/services/projects/create_service.rb
+++ b/app/services/projects/create_service.rb
@@ -13,8 +13,8 @@ module Projects
         return ::Projects::CreateFromTemplateService.new(current_user, params).execute
       end
 
-      forked_from_project_id = params.delete(:forked_from_project_id)
       import_data = params.delete(:import_data)
+      relations_block = params.delete(:relations_block)
 
       @project = Project.new(params)
 
@@ -24,11 +24,6 @@ module Projects
         return @project
       end
 
-      unless allowed_fork?(forked_from_project_id)
-        @project.errors.add(:forked_from_project_id, 'is forbidden')
-        return @project
-      end
-
       set_project_name_from_path
 
       # get namespace id
@@ -47,6 +42,7 @@ module Projects
         @project.namespace_id = current_user.namespace_id
       end
 
+      relations_block&.call(@project)
       yield(@project) if block_given?
 
       # If the block added errors, don't try to save the project
@@ -54,10 +50,6 @@ module Projects
 
       @project.creator = current_user
 
-      if forked_from_project_id
-        @project.build_forked_project_link(forked_from_project_id: forked_from_project_id)
-      end
-
       save_project_and_import_data(import_data)
 
       after_create_actions if @project.persisted?
@@ -80,15 +72,6 @@ module Projects
     end
 
     # rubocop: disable CodeReuse/ActiveRecord
-    def allowed_fork?(source_project_id)
-      return true if source_project_id.nil?
-
-      source_project = Project.find_by(id: source_project_id)
-      current_user.can?(:fork_project, source_project)
-    end
-    # rubocop: enable CodeReuse/ActiveRecord
-
-    # rubocop: disable CodeReuse/ActiveRecord
     def allowed_namespace?(user, namespace_id)
       namespace = Namespace.find_by(id: namespace_id)
       current_user.can?(:create_projects, namespace)