creating a new entity/associating an entity to another one

[Herman Yu]

Hi Everyone,

I am implementing a model in v0.5, and I would like to know the correct syntax 
of creating a new entity, and associating an entity to another one.

I have two objects/classTypes defined as:


{
      "typeName”:”BusinessMetadata",
      "attributeDefinitions":[
        {
          "name”:”Category",
          "dataTypeName”:”string",
          …
        },
        ...
      ]
 }
…

{
      "typeName”:"Asset",
      "attributeDefinitions":[
        {
          "name”:"busMeta",
          "dataTypeName”:"BusinessMetadata",
          …
        },
        ...
      ]
    },

and i would like to create an entity of “BusinessMetaData” and then associate 
it with an existing entity of Asset, what is the correct syntax/json definition 
using REST API http:// …api/atlas/entities -x PUT . Or is there a documentation 
which can help?

I tried to create the entity of “BusinessMetaData” through REST API using an 
entity definition of :
{
          "typeName":"BusinessMetaData",
          "values":{
            "category":"MiddleOffice",
            …..
          }
}

but got the following error:

2015-10-01 16:13:02,228 ERROR - [177746769@qtp-159259014-74 - 
82c2ab59-556a-4e62-979c-ef7711059fdb:] ~ Unable to deserialize json={       
"typeName":"BusinessMetaData",          "values":{        
"category":"MiddleOffice",      "term":"FX Trade",      "description":"FX 
Trades of Middle Office"    }} (DefaultMetadataService:244)
org.json4s.ParserUtil$ParseException: unknown token  
Near: {  
        at org.json4s.native.JsonParser$Parser.fail(JsonParser.scala:207)
        at org.json4s.native.JsonParser$Parser.nextToken(JsonParser.scala:294)
        at org.json4s.native.JsonParser$$anonfun$1.apply(JsonParser.scala:159)
        at org.json4s.native.JsonParser$$anonfun$1.apply(JsonParser.scala:117)
        at org.json4s.native.JsonParser$.parse(JsonParser.scala:105)
        at org.json4s.native.JsonParser$.parse(JsonParser.scala:53)
        at org.json4s.native.Serialization$.read(Serialization.scala:71)
……
2015-10-01 16:13:02,228 ERROR - [177746769@qtp-159259014-74 - 
82c2ab59-556a-4e62-979c-ef7711059fdb:] ~ Unable to persist entity instance 
(EntityResource:112)
java.lang.IllegalArgumentException: Unable to deserialize json
        at 
org.apache.atlas.services.DefaultMetadataService.deserializeClassInstance(DefaultMetadataService.java:245)
        at 
org.apache.atlas.services.DefaultMetadataService.createEntity(DefaultMetadataService.java:229)
        at 
org.apache.atlas.web.resources.EntityResource.submit(EntityResource.java:96)
        at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)


Thanks
Herman