Generator fails on anyOf with array type containing enums

[jamesrom]

Description

The go-jsonschema generator fails to handle anyOf schemas that contain an array type with enum items alongside other types.

Error Message

could not generate type for field "dayOfWeek": invalid type "array": unexpected type "array" here

Test Case

The following JSON Schema causes the generator to fail:

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "properties": {
        "dayOfWeek": {
            "anyOf": [
                {
                    "type": "array",
                    "items": {
                        "enum": [
                            "Monday",
                            "Tuesday",
                            "Wednesday",
                            "Thursday",
                            "Friday",
                            "Saturday",
                            "Sunday"
                        ]
                    }
                },
                {
                    "type": "string",
                    "enum": [
                        "All",
                        "Weekdays"
                    ]
                }
            ]
        }
    }
}

Expected Behavior

The generator should create a type that can handle either:

• An array of weekday strings (Monday through Sunday)
• A single string with special values ("All" or "Weekdays")

This is a valid JSON Schema pattern commonly used to accept either a list of specific values OR a shorthand string representation.

Root Cause

The error originates from pkg/codegen/utils.go:170 where the getTypeForSchema function explicitly rejects array and object types in certain contexts:

case schemas.TypeNameObject, schemas.TypeNameArray:
    return nil, fmt.Errorf("%w %q here", errUnexpectedType, jsType)

This appears to be a limitation in how the generator processes anyOf schemas containing complex types.

Reproduction

To reproduce this issue:

1. Save the above JSON schema as tests/data/core/anyOf/anyOf.8.json
2. Run: go test ./tests -v -run "TestCore/core/anyOf/anyOf.8"
3. Observe the failure with the error message above

Impact

This prevents users from defining schemas with flexible input patterns that are valid according to the JSON Schema specification.