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Fix key validator false negatives on empty collections #363

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Jun 18, 2021
Merged

Fix key validator false negatives on empty collections #363

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7 changes: 6 additions & 1 deletion lib/dry/schema/key_validator.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,14 @@ def key_paths(hash)
hash.flat_map { |key, _|
case (value = hash[key])
when Hash
next key.to_s if value.empty?

[key].product(key_paths(hash[key])).map { |keys| keys.join(DOT) }
when Array
hashes_or_arrays = value.select { |e| e.is_a?(Array) || e.is_a?(Hash) }
hashes_or_arrays = value.select { |e| (e.is_a?(Array) || e.is_a?(Hash)) && !e.empty? }

next key.to_s if hashes_or_arrays.empty?

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since it's skipping empy items now, aren't we going to end up with nils in the resulting array?

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@Drenmi Drenmi Jun 18, 2021 •
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The next keyword optionally accepts one argument which will be taken by the iterator. In this case that would be key.to_s if there are no nested collections. 🙂

3.times.map { |n| next n }
#=> [0, 1, 2]

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Ah doooh of course! Thanks for the explanation 😄

hashes_or_arrays.flat_map.with_index { |el, idx|
key_paths(el).map { |path| ["#{key}[#{idx}]", *path].join(DOT) }
}
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10 changes: 8 additions & 2 deletions spec/integration/schema/unexpected_keys_spec.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,10 @@
foo: "unexpected",
name: "Jane",
ids: [1, 2, 3, 4],
address: {bar: "unexpected", city: "NYC", zipcode: "1234"},
qux: [],
quux: [{}],
hoge: {},
address: {bar: "unexpected", baz: [1], city: "NYC", zipcode: "1234"},
roles: [
{name: "admin", expires_at: Date.today},
{name: "editor", foo: "unexpected", expires_at: Date.today}
Expand All @@ -35,7 +38,10 @@
expect(schema.(input).errors.to_h)
.to eql(
foo: ["is not allowed"],
address: {bar: ["is not allowed"]},
qux: ["is not allowed"],
quux: ["is not allowed"],
hoge: ["is not allowed"],
address: {bar: ["is not allowed"], baz: ["is not allowed"]},
roles: {1 => {foo: ["is not allowed"]}}
)
end
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