dry-rb/dry-validation

Support for pattern-matched rules

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#678 opened on Dec 16, 2020

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Description

In order to make defining rules that depend on additional conditions nicer, we can have something like this:

params do
  optional(:per_page).value(:integer)
end

rule(:per_page).if(:key?).validate(gt?: 0, lteq?: 20)

See the original conversation: https://github.com/dry-rb/dry-validation/issues/540#issuecomment-744022950

Contributor guide

Research direction
Look at the existing rule definitions in the dry validation source, especially how the `rule` macro works and how it handles dependencies. Investigate the referenced issue #540 for context. Then implement a mechanism to add conditional `if` clauses to rules, allowing pattern matching based on key existence or other predicates.
Tech stack
ruby
Domain
backend
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.
Half day
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
RubyGitdry validation library basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70