dry-rb/dry-validation
Missing way to set rules for nested arrays easily
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#745 ouverte le 10 déc. 2025
bughelp wanted
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Description
Describe the bug
I'd like to validate something with structure like:
{
foos: [
{
bars: [
{some_entry: 1},
{some_entry: 2}
]
}
]
}
As far as I can tell, there's no good way to do that. I can't nest rules. There's a way to validate the nested entries with key paths, like in here: https://github.com/dry-rb/dry-validation/issues/732#issuecomment-1770474838
But this is getting really messy. At that point the rule is not really for :foos either - it's for something much deeper.
Expected behavior
I'd really like to either stack contracts, so that the rules can be attached there, like:
class FooContract < Dry::Validation::Contract
params do
required(:bars).hash(BarContract)
end
rule(:some_entry) ...
end
class MainContract < Dry::Validation::Contract
params do
required(:foos).array { hash(FooContract) }
end
end
Or the ability to stack rules, so:
class MainContract < Dry::Validation::Contract
params do
required(:foos).array { hash(FooParams) }
end
rule(:foos).each do |foo|
rule(foos: foo).each do |bar|
key(....)....
end
end
end
My environment
- Affects my production application: No