Thanks. I'm so happy to see there is an active Avro community.
I've created the schema below and I can parse it without errors. How
do I create a "User" record object in Java?
If I use "new GenericData.Record(usersSchema)" I get the "Users"
Record and not the "User" Record?
Thanks,
Curtis
{
"type": "record",
"name": "Users",
"fields": [
{
"name": "userArray",
"type": {
"type": "array",
"items": {
"name": "User",
"type": "record",
"fields": [
{"name": "name", "type": "string"},
{"name": "id", "type": "long"}
]
}
}
}
]
}
On Mon, Mar 21, 2011 at 10:18 AM, Doug Cutting <[email protected]> wrote:
> You can use the schema David provided directly for arrays of the User
> record. But if you want to have a named type for an array of User then
> you need to define a record with that as a field, e.g., something like:
>
> {"type": "record",
> "name": "Users",
> "fields": [
> "name": "userArray",
> "type": {
> "type": "array",
> "items": {
> "name": "User",
> "type": "record",
> "fields" : [ .... ]
> }
> }
> ]
> }
>
> Doug
>
> On 03/21/2011 09:43 AM, Curtis Jensen wrote:
>> Great. However, how to use it?
>> I've modified my schema to look like below:
>>
>> In java, when I try to parse this schema with:
>> Schema usersSchema = Schema.parse(USERS_SCHEMA);
>>
>> I get an "org.apache.avro.SchemaParseException: No type" exception
>> (Here USERS_SCHEMA is the schema below).
>>
>>
>> {
>> "name": "Users",
>> "type": {
>> "type": "array",
>> "items": {
>> "name": "User",
>> "type": "record",
>> "fields" : [
>> {"name": "name", "type": "string"},
>> {"name": "id", "type": "long"}
>> ]
>> }
>> }
>> }
>>
>> On Mon, Mar 21, 2011 at 8:42 AM, David Rosenstrauch <[email protected]>
>> wrote:
>>> On 03/21/2011 11:28 AM, Curtis Jensen wrote:
>>>>
>>>> How does one create a schema for an array of records?
>>>>
>>>> For example, I have a record schema for a user (name and id; see
>>>> below). I would like to serialize an array of users. I've tried
>>>> various combinations of things, and I'm not getting it to work.
>>>>
>>>> Thanks,
>>>> Curtis
>>>>
>>>>
>>>> [
>>>> {
>>>> "name": "User",
>>>> "type": "record",
>>>> "fields": [
>>>> {"name": "name", "type": "string"},
>>>> {"name": "id", "type": "int"}]
>>>> },
>>>> {
>>>> "type": "array", "items": "User"
>>>> }
>>>> ]}
>>>
>>>
>>> We do it like so:
>>>
>>> "name": "AttributeMappings",
>>> "type": {
>>> "type": "array",
>>> "items": {
>>> "name": "AttributeMapping",
>>> "type": "record",
>>> "fields" : [
>>> {"name": "Key", "type": "long"},
>>> {"name": "Value", "type": "long"}
>>> ]
>>> }
>>> }
>>>
>>> HTH,
>>>
>>> DR
>>>
>
