Question 1

How do I add custom validation rules to JSON Schema in Ruby?

Accepted Answer

Extend schemas by creating custom attribute classes and registering them with the validator, as shown in the 'Extending Schemas' section of the README, which includes an example with a 'bitwise-and' property.

Question 2

What's the difference between JSON::Validator.validate and fully_validate?

Accepted Answer

validate returns a boolean, validate! raises an exception on failure, and fully_validate returns an array of error messages, allowing for detailed error handling in different application scenarios.

Question 3

How can I validate a JSON schema itself against the metaschema?

Accepted Answer

Use JSON::Validator.validator_for_name or validator_for_uri to retrieve the appropriate metaschema, then validate your schema against it, as explained in the 'Validating a JSON Schema' section.

Question 4

json-schema gem vs other Ruby JSON validation libraries like active_model_serializers?

Accepted Answer

json-schema is specifically for JSON Schema standards compliance, while active_model_serializers focuses on serializing Rails models; choose json-schema when you need precise schema validation against drafts.

Question 5

How to handle remote schema references without making HTTP calls?

Accepted Answer

Configure the schema reader to control URI resolution or pre-register schemas using JSON::Validator.add_schema, as detailed in the 'Controlling Remote Schema Reading' section for secure environments.

Question 6

What are the performance implications of using the json-schema gem?

Accepted Answer

Performance depends on the JSON backend; yajl-ruby is faster than the standard json gem, but for very high throughput, consider compiled validators, as Ruby interpretation may add overhead.

Question 7

How to upgrade from version 2 to version 3 of json-schema?

Accepted Answer

Check the CHANGELOG for breaking changes, note the dropped support for Ruby versions below 2.5, and update your code to handle new defaults, such as Draft 6 support and deprecated features.

Ruby JSON Schema Validator

What is Ruby JSON Schema Validator?

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