yogthos/migratus

Add a function to rollback to a target migration similar to migrate-until-just-before for ups

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#200 opened on Feb 17, 2021

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enhancementhelp wanted

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Description

Right now you can only down migrations by a specific id(s). Sometimes, I want to rollback to a specific point similar to going up to a specific point via migratus.core/migrate-until-just-before. Could the implementation be as simple as:

(defn rollback-until-just-after
  [config migration-id]
  (with-store [store (proto/make-store config)]
              (->> (uncompleted-migrations config store)
                   (map proto/id)
                   distinct
                   sort
                   reverse
                   (take-while #(> % migration-id))
                   (apply down config))))

Does this make sense?

Contributor guide

Research direction
Study the existing down migration logic and the migrate until just before function, then implement rollback until just after following the suggested pattern, ensuring correct ordering and idempotency.
Tech stack
clojure
Domain
backenddatabase
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ClojureDatabase migrations
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65