Add ProjectRepository model

app/models/project.rb

@@ -120,6 +120,8 @@ class Project < ActiveRecord::Base
   after_create :ensure_storage_path_exists
   after_save :ensure_storage_path_exists, if: :namespace_id_changed?
 
+  after_create :create_project_repository
+
   acts_as_ordered_taggable
 
   attr_accessor :old_path_with_namespace
@@ -130,6 +132,7 @@ class Project < ActiveRecord::Base
   alias_attribute :title, :name
 
   # Relations
+  belongs_to :project_repository, foreign_key: :repository_id
   belongs_to :pool_repository
   belongs_to :creator, class_name: 'User'
   belongs_to :group, -> { where(type: 'Group') }, foreign_key: 'namespace_id'
@@ -1207,6 +1210,10 @@ class Project < ActiveRecord::Base
     false
   end
 
+  def create_project_repository
+    update(project_repository: ProjectRepository.create!(shard_name: repository_storage, disk_path: disk_path))
+  end
+
   def create_repository(force: false)
     # Forked import is handled asynchronously
     return if forked? && !force

app/models/project_repository.rb

+# frozen_string_literal: true
+
+class ProjectRepository < ActiveRecord::Base
+  include RepositoryOnShard
+
+  has_one :project, foreign_key: :repository_id
+
+  class << self
+    def find_project(disk_path)
+      find_by(disk_path: disk_path)&.project
+    end
+  end
+end

changelogs/unreleased/tc-repo-full-path-in-db.yml

+---
+title: Add model and relation to store repo full path in database
+merge_request: 23143
+author:
+type: added

spec/models/project_repository_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ProjectRepository do
+  describe 'associations' do
+    it { is_expected.to belong_to(:shard) }
+    it { is_expected.to have_one(:project) }
+  end
+
+  describe '.find_project' do
+    it 'finds project by disk path' do
+      project = create(:project)
+
+      expect(described_class.find_project(project.disk_path)).to eq(project)
+    end
+
+    it 'returns nil when it does not find the project' do
+      expect(described_class.find_project('@@unexisting/path/to/project')).to be_nil
+    end
+  end
+end

spec/models/project_spec.rb

@@ -8,6 +8,7 @@ describe Project do
     it { is_expected.to belong_to(:group) }
     it { is_expected.to belong_to(:namespace) }
     it { is_expected.to belong_to(:creator).class_name('User') }
+    it { is_expected.to belong_to(:project_repository) }
     it { is_expected.to belong_to(:pool_repository) }
     it { is_expected.to have_many(:users) }
     it { is_expected.to have_many(:services) }
@@ -1729,6 +1730,18 @@ describe Project do
     end
   end
 
+  describe '#create_project_repository' do
+    let(:project) { create(:project, :repository) }
+
+    it 'creates a project_repository' do
+      project.create_project_repository
+
+      expect(project).to have_project_repository
+      expect(project.project_repository.disk_path).to eq(project.disk_path)
+      expect(project.project_repository.shard_name).to eq(project.repository_storage)
+    end
+  end
+
   describe '#create_repository' do
     let(:project) { create(:project, :repository) }
     let(:shell) { Gitlab::Shell.new }