David warburton created AVRO-4156:
-------------------------------------

             Summary: avro-js fails to validate objects union type
                 Key: AVRO-4156
                 URL: https://issues.apache.org/jira/browse/AVRO-4156
             Project: Apache Avro
          Issue Type: Bug
          Components: javascript
    Affects Versions: 1.12.0
            Reporter: David warburton


When I define a record with a field that has a type that is a union then 
type.isValid always returns false most of the time. Unions that include null as 
a type can validate when a field has a null value, but a type like int or 
string doesn't work.

 
 
{code:java}
var avro = require('avro-js');
const schema2 = {
  "type": "record",
  "name": "TypeUnion",
  "namespace": "ex1",
  "fields": [
    { "name": "optional_int", "type": ["int"] },
]};
let type = avro.parse(schema2);
const example2 = {
  optional_int: 1
};
console.log(type.isValid(example2, { errorHook: console.error}));
{code}
 



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