in lib/gitlab/import_export/project/relation_factory.rb [108:135]
def setup_models
case @relation_name
when :merge_request_diff_files then setup_diff
when :note_diff_file then setup_diff
when :notes, :Note then setup_note
when :'Ci::Pipeline' then setup_pipeline
when *BUILD_MODELS then setup_build
when :issues then setup_work_item
when :'Ci::PipelineSchedule' then setup_pipeline_schedule
when :'ProtectedBranch::MergeAccessLevel' then setup_protected_ref_access_level
when :'ProtectedBranch::PushAccessLevel' then setup_protected_ref_access_level
when :'ProtectedTag::CreateAccessLevel' then setup_protected_ref_access_level
when :ApprovalProjectRulesProtectedBranch then setup_merge_approval_protected_branch
when :releases then setup_release
when :merge_requests, :MergeRequest, :merge_request then setup_merge_request
when :approvals then setup_approval
when :events then setup_event
when :'DesignManagement::Version' then setup_design_management_version
end
update_project_references
update_group_references
return unless RELATIONS_WITH_REWRITABLE_USERNAMES.include?(@relation_name) && @rewrite_mentions
update_username_mentions(@relation_hash)
end