diff options
Diffstat (limited to 'db/optional_migrations')
-rw-r--r-- | db/optional_migrations/composite_primary_keys.rb | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/db/optional_migrations/composite_primary_keys.rb b/db/optional_migrations/composite_primary_keys.rb new file mode 100644 index 00000000000..0fd3fca52dd --- /dev/null +++ b/db/optional_migrations/composite_primary_keys.rb @@ -0,0 +1,63 @@ +# This migration adds a primary key constraint to tables +# that only have a composite unique key. +# +# This is not strictly relevant to Rails (v4 does not +# support composite primary keys). However this becomes +# useful for e.g. PostgreSQL's logical replication (pglogical) +# which requires all tables to have a primary key constraint. +# +# In that sense, the migration is optional and not strictly needed. +class CompositePrimaryKeysMigration < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + DOWNTIME = false + + Index = Struct.new(:table, :name, :columns) + + TABLES = [ + Index.new(:issue_assignees, 'index_issue_assignees_on_issue_id_and_user_id', %i(issue_id user_id)), + Index.new(:user_interacted_projects, 'index_user_interacted_projects_on_project_id_and_user_id', %i(project_id user_id)), + Index.new(:merge_request_diff_files, 'index_merge_request_diff_files_on_mr_diff_id_and_order', %i(merge_request_diff_id relative_order)), + Index.new(:merge_request_diff_commits, 'index_merge_request_diff_commits_on_mr_diff_id_and_order', %i(merge_request_diff_id relative_order)), + Index.new(:project_authorizations, 'index_project_authorizations_on_user_id_project_id_access_level', %i(user_id project_id access_level)), + Index.new(:push_event_payloads, 'index_push_event_payloads_on_event_id', %i(event_id)), + Index.new(:schema_migrations, 'unique_schema_migrations', %(version)), + ] + + disable_ddl_transaction! + + def up + return unless Gitlab::Database.postgresql? + + disable_statement_timeout + TABLES.each do |index| + add_primary_key(index) + end + end + + def down + return unless Gitlab::Database.postgresql? + + disable_statement_timeout + TABLES.each do |index| + remove_primary_key(index) + end + end + + private + def add_primary_key(index) + execute "ALTER TABLE #{index.table} ADD PRIMARY KEY USING INDEX #{index.name}" + end + + def remove_primary_key(index) + temp_index_name = "#{index.name[0..58]}_old" + rename_index index.table, index.name, temp_index_name if index_exists_by_name?(index.table, index.name) + + # re-create unique key index + add_concurrent_index index.table, index.columns, unique: true, name: index.name + + # This also drops the `temp_index_name` as this is owned by the constraint + execute "ALTER TABLE #{index.table} DROP CONSTRAINT IF EXISTS #{temp_index_name}" + end +end + |