fix: update internal schema merging #665

ivan-tymoshenko · 2023-11-25T14:04:51Z

This PR adds a proper schema merging for different cases:

root schema + oneOf/anyOf subschema
root schema + all allOf subschemas
root schema + then schema; root schema + else schema

gurgunday · 2023-11-25T14:38:15Z

index.js

-      }
-      Object.assign(mergedSchema.properties, allOfSchema.properties)
-    }
+  for (let location of locations) {


Won't a simple for loop be faster than iterators?

It was the case last time I checked

This kind of change doesn't create any perf difference unless it places in a very very high-loaded bottleneck (not this library). This library could be optimized by reducing the amount of time it clones the schemas.

Feel free to run benchmarks and prove me wrong.

I see, no problem I'll take your word 😄

index.js

mcollina

lgtm

gurgunday · 2023-11-25T14:52:09Z

index.js

+  }
+  for (const subSchema of Object.values(schema)) {
+    if (
+      typeof subSchema === 'object' &&


Not familiar so just asking, we are sure there can't be a null value right?

Suggested change

typeof subSchema === 'object' &&

subSchema != null &&

It shouldn't be, but this is a good catch. Will add a check.

ivan-tymoshenko · 2023-12-11T20:29:28Z

Need a proper review for this one. This is more difficult than it might seem.

mcollina · 2023-12-12T10:21:32Z

package.json

    "ajv": "^8.10.0",
    "ajv-formats": "^2.1.1",
    "fast-deep-equal": "^3.1.3",
    "fast-uri": "^2.1.0",
    "rfdc": "^1.2.0",
-    "json-schema-ref-resolver": "^1.0.1"
+    "json-schema-ref-resolver": "^1.0.1",
+    "json-schema-merge-allof": "^0.8.1"


The use of https://www.npmjs.com/package/json-schema-merge-allof does not inspire me a lot of faith as it seems an unmaintained module. Is there an alternative? Can we fork or embed its code in here?

Unfortunatelly this is the best solution I could find. We can write our own solution, but I don't have time for this right now. Anyway it should be better that our currect merge logic.

ivan-tymoshenko · 2024-01-16T12:51:46Z

Waiting for https://github.com/fastify/merge-json-schemas release.

Uzlopak · 2024-01-17T18:38:50Z

test/allof.test.js


  const schema = {
    allOf: [
      { type: 'string' },
      { type: 'number' }
    ]
  }
-  t.throws(() => build(schema), new Error('allOf schemas have different type values'))
+  try {
+    build(schema)


Suggested change

build(schema)

build(schema)

t.fail('Should have thrown')

Uzlopak · 2024-01-17T18:39:09Z

test/allof.test.js


  const schema = {
    allOf: [
      { format: 'date' },
      { format: 'time' }
    ]
  }
-  t.throws(() => build(schema), new Error('allOf schemas have different format values'))
+  try {
+    build(schema)


Suggested change

build(schema)

build(schema)

t.fail('Should have thrown')

Uzlopak · 2024-01-17T18:42:18Z

index.js

-    }
+  if (
+    schema.$id !== undefined &&
+    schema.$id.charAt(0) !== '#'


What if schema.$id is an empty string?

It shouldn't be an empty string. If user explicitly add a schema $id field with empty string value, it's kind of his problem. Anyway, this code will prefix all nested schemas' $refs with an empty string then.

Uzlopak · 2024-01-17T18:44:08Z

index.js

-    mergeAllOfSchema(context, location, schema, clone(schema))
-    schema = location.schema
+  code += `
+    else throw new TypeError(\`The value of '${schemaRef}' does not match schema definition.\`)


Suggested change

else throw new TypeError(\`The value of '${schemaRef}' does not match schema definition.\`)

else throw new TypeError(\`The value of '${schemaRef}' does not match the schema definition.\`)

?

I didn't add this error. If you want to update the error message for this error, you can create another PR.

Uzlopak · 2024-01-17T18:45:31Z

test/if-then-else.test.js

 })
-const noElseGreetingOutput = JSON.stringify({
-  kind: 'greeting',
-  foo: 'FOO',
-  bar: 42,
-  hi: 'HI',
-  hello: 45,
-  a: 'A',
-  b: 35
-})
+const noElseGreetingOutput = JSON.stringify({})


Why did you change this?

Because the test was wrong.

Here is a schema:

fast-json-stringify/test/if-then-else.test.js

Line 167 in 69a34a2

const noElseSchema = {

Here is an input data:

fast-json-stringify/test/if-then-else.test.js

Line 209 in 69a34a2

const greetingInput = {

As you can see the if condition doesn't fullfil as greetingInput.kind equal greeting and not a foobar, so it should use else schema instead of then. And as else schema is missing the result is an empty object.

Uzlopak · 2024-01-17T18:46:35Z

test/allof.test.js

 })

-test('allOf: throw Error if nullable mismatch /1', (t) => {
+test('recursive nested allOfs', (t) => {


Why did you change these two allOf tests?

I didn't change the test here. I removed allOf: throw Error if nullable mismatch /1 test and added a couple of new tests. I dropped the allOf: throw Error if nullable mismatch /1 because now the merging algoritm is more accurate and can resolve the situation when two schemas has different nullable keyword values.

If one schema has nullable = true and another one has nullable = false the merged schema will have nullable = false. Now fast-json-stringify just throws an error in this case.

Uzlopak · 2024-01-17T18:53:42Z

Tbh. This is a quite complex PR. I dont think that I could approve it with the full confidence that I understood everything. I read over it, and tbh. I did not make a deep dive. Just a raw review, if everything makes still kind of sense.

Also I dont want to stall to merge this, just because I am not confident enough to approve it.

For my approval I just need the confidence, that we didnt break the api contract and if we break it, it should be an informed decision.As we have a good code coverage in this project, it would enough for me, if no old tests were chaged, and if they were changed, that they dont reflect a significant behavioural change.

I would like to know why some of the tests got changed/removed in the allof.test.js, as it seems the only place where the behaviour changed significantly. If those questions are answered, I am happy to approve it.

mcollina · 2024-01-18T11:19:46Z

@Uzlopak let me know if you have any further concerns, otherwise I'd like to ship this soon.

Uzlopak

Thank you for the explaination.
LGTM

Pezmc · 2024-01-30T16:30:02Z

@Uzlopak @mcollina I'm currently hitting this bug (oneOf results in a trailing comma) and can confirm that this PR resolves it. The latest release of fast-json-strinify was 5.10.0 three weeks ago and does not include this fix, how can I help cut a new release?

Signed-off-by: Matteo Collina <[email protected]>

This reverts commit d95ef87.

This reverts commit 9dd8cb6.

gurgunday reviewed Nov 25, 2023

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mcollina approved these changes Nov 25, 2023

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ivan-tymoshenko marked this pull request as draft November 25, 2023 14:42

gurgunday reviewed Nov 25, 2023

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ivan-tymoshenko added 2 commits December 6, 2023 00:13

feat: merge schemas

672d897

fix: use proper schema merge for all cases

fe65ff4

ivan-tymoshenko force-pushed the fix-merge-schema-ref-resolving branch from 0d36211 to fe65ff4 Compare December 11, 2023 20:22

This was linked to issues Dec 11, 2023

Recursive validation schema compiles but fails at runtime #648

Closed

Schema serialization of anyOf/oneOf properties are parsed incorrectly #642

Closed

ivan-tymoshenko marked this pull request as ready for review December 11, 2023 20:25

ivan-tymoshenko requested review from mcollina, gurgunday, Uzlopak, Eomm and climba03003 December 11, 2023 20:29

ivan-tymoshenko changed the title ~~fix: update merged schema local refs~~ fix: update internal schema merging Dec 11, 2023

ivan-tymoshenko added 2 commits December 11, 2023 21:35

update

b7afc84

update

cd77a40

mcollina reviewed Dec 12, 2023

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ivan-tymoshenko mentioned this pull request Jan 15, 2024

feat: add mergeSchemas function fastify/merge-json-schemas#1

Merged

deps: use merge-json-schema package

cfdb917

ivan-tymoshenko marked this pull request as draft January 16, 2024 12:51

deps: use @fastify/merge-json-schemas package

69a34a2

ivan-tymoshenko marked this pull request as ready for review January 17, 2024 14:39

ivan-tymoshenko mentioned this pull request Jan 17, 2024

fix: anyOf produces invalid json due to extra comma #651

Closed

4 tasks

Uzlopak reviewed Jan 17, 2024

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test: update tests

99ba443

Uzlopak approved these changes Jan 18, 2024

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mcollina merged commit d95ef87 into master Jan 18, 2024
21 checks passed

Uzlopak deleted the fix-merge-schema-ref-resolving branch January 18, 2024 15:06

ivan-tymoshenko referenced this pull request Feb 1, 2024

Bumped v5.11.0

3dc8dca

Signed-off-by: Matteo Collina <[email protected]>

mcollina added a commit that referenced this pull request Feb 1, 2024

Revert "fix: update internal schema merging (#665)"

9dd8cb6

This reverts commit d95ef87.

ivan-tymoshenko added a commit that referenced this pull request Feb 4, 2024

Revert "Revert "fix: update internal schema merging (#665)""

4fa297b

This reverts commit 9dd8cb6.

mcollina pushed a commit that referenced this pull request Feb 5, 2024

Revert "Revert "fix: update internal schema merging (#665)""

35346a7

This reverts commit 9dd8cb6.

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fix: update internal schema merging #665

fix: update internal schema merging #665

ivan-tymoshenko commented Nov 25, 2023 •

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	else throw new TypeError(\`The value of '${schemaRef}' does not match schema definition.\`)
	else throw new TypeError(\`The value of '${schemaRef}' does not match the schema definition.\`)

fix: update internal schema merging #665

fix: update internal schema merging #665

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