db-migrate/node-db-migrate

Feature Request: Transaction configuration on a per migration basis

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#659 opened on Dec 11, 2019

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 (5 comments) (3 reactions) (1 assignee)JavaScript (2,296 stars) (367 forks)batch import
featuregood first issuehelp wanted

Description

I'm submitting a...

  • Bug report
  • Feature request
  • Question

Current behavior

There is no way to turn off transactions for individual migrations.

Expected behavior

Certain migrations need to be run outside of a transaction. For example, in PostgreSQL, ALTER TYPE type_name ADD new_value cannot be run in a transaction. The rest of the migrations, however should be run in a transaction. There is currently no way to configure individual migrations to not use a transaction block. It would be extremely helpful to allow this to be part of the configuration for a single migration.

Contributor guide

Tech stack
nodejspostgresql
Domain
databasebackend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of db migrateFamiliarity with database transactions
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue requests a per migration transaction toggle, specifically for PostgreSQL operations like ALTER TYPE. The assignee and comments indicate ongoing work but no PR. Investigate the db migrate migration runner code (likely in lib/migrator.js) to understand current transaction handling. Review previous PRs or design discussions for context. Determine a backward compatible configuration approach, such as adding a 'transaction' property in migration instances or config files.