Rename the Repository table to PoolRepository

To separate the different kinds of repositories we have at GitLab this
table will be renamed to pool_repositories. A project can, for now at
least, be member of none, or one of these. The table will get additional
columns in a later merge request where more logic is implemented for the
model.

Further included is a small refactor of logic around hashing ids for the
disk_path, mainly to ensure a previous implementation is reusable.

The disk_path for the pool_repositories table no longer has a NOT NULL
constraint, but given the hashing of the ID requires the DB to assign
the record an ID, an after_create hook is used to update the value.

A related MR is:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/23143, adding
tables for 'normal' repositories and wiki_repositories.

2 files changed, 20 insertions, 0 deletions

diff --git a/db/migrate/20181120082911_rename_repositories_pool_repositories.rb b/db/migrate/20181120082911_rename_repositories_pool_repositories.rb
new file mode 100644
index 00000000000..165771c4775
--- /dev/null
+++ b/db/migrate/20181120082911_rename_repositories_pool_repositories.rb
@@ -0,0 +1,11 @@
+class RenameRepositoriesPoolRepositories < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  # This change doesn't require downtime as the table is not in use, so we're
+  # free to change an empty table
+  DOWNTIME = false
+
+  def change
+    rename_table :repositories, :pool_repositories
+  end
+end
diff --git a/db/migrate/20181123135036_drop_not_null_constraint_pool_repository_disk_path.rb b/db/migrate/20181123135036_drop_not_null_constraint_pool_repository_disk_path.rb
new file mode 100644
index 00000000000..bcd969e91c5
--- /dev/null
+++ b/db/migrate/20181123135036_drop_not_null_constraint_pool_repository_disk_path.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class DropNotNullConstraintPoolRepositoryDiskPath < ActiveRecord::Migration[5.0]
+  DOWNTIME = false
+
+  def change
+    change_column_null :pool_repositories, :disk_path, true
+  end
+end