我试图让Python解析Avro模式,例如以下内容......
from avro import schema
mySchema = """
{
"name": "person",
"type": "record",
"fields": [
{"name": "firstname", "type": "string"},
{"name": "lastname", "type": "string"},
{
"name": "address",
"type": "record",
"fields": [
{"name": "streetaddress", "type": "string"},
{"name": "city", "type": "string"}
]
}
]
}"""
parsedSchema = schema.parse(mySchema)
...我得到以下异常:
avro.schema.SchemaParseException: Type property "record" not a valid Avro schema: Could not make an Avro Schema object from record.
我做错了什么?
答案 0 :(得分:37)
根据网络上的其他消息来源,我会重写你的第二个地址定义:
mySchema = """
{
"name": "person",
"type": "record",
"fields": [
{"name": "firstname", "type": "string"},
{"name": "lastname", "type": "string"},
{
"name": "address",
"type": {
"type" : "record",
"name" : "AddressUSRecord",
"fields" : [
{"name": "streetaddress", "type": "string"},
{"name": "city", "type": "string"}
]
},
}
]
}"""
答案 1 :(得分:4)
每次我们提供类型为命名类型时,该字段需要给出:
"name":"some_name",
"type": {
"name":"CodeClassName",
"type":"record/enum/array"
}
但是,如果命名类型是union,那么我们不需要额外的类型字段,并且可以用作:
"name":"some_name",
"type": [{
"name":"CodeClassName1",
"type":"record",
"fields": ...
},
{
"name":"CodeClassName2",
"type":"record",
"fields": ...
}]
希望这进一步澄清!