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From: Herman Yu <herman.yu@teeupdata.com>
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Subject: Re: creating a new entity/associating an entity to another one
Date: Thu, 1 Oct 2015 16:30:08 -0400
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Thanks Seetharam, see my comments below.

On Oct 1, 2015, at 4:22 PM, Seetharam Venkatesh =
<venkatesh@innerzeal.com> wrote:

> The easiest way to do this is to use the type system API. Please look =
at
> the examples in QuickStart.java or any integration test under webapp =
module.
>=20
[HY] I am doing some POC work, and would like to use REST API for quick =
test. Is it possible?


> If you plan to associate 2 entities, say A and B together, then A =
needs to
> compose B. However, you want to associate traits (tags), then you can
> associate any arbitrary Trait to any entity. There are APIs for both.
[HY] I can associated Traits to any entity. To associate two Entities. =
Would you please elaborate "A has to compose B=94. the relationship in =
my test is quite similar to the hive model, many "hive_table=94 are =
associated a =93hive_db=94, in my test, many =93Asset=94 are associated =
to =93BusinessMetaData=94.

what is the best way for me got get the details json definition so to =
use REST API through command line, or I have to go with type system API =
using Java?

Thanks
Herman.

>=20
> On Thu, Oct 1, 2015 at 1:18 PM Herman Yu <herman.yu@teeupdata.com> =
wrote:
>=20
>> Hi Everyone,
>>=20
>> 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.
>>=20
>> I have two objects/classTypes defined as:
>>=20
>>=20
>> {
>>      "typeName=94:=94BusinessMetadata",
>>      "attributeDefinitions":[
>>        {
>>          "name=94:=94Category",
>>          "dataTypeName=94:=94string",
>>          =85
>>        },
>>        ...
>>      ]
>> }
>> =85
>>=20
>> {
>>      "typeName=94:"Asset",
>>      "attributeDefinitions":[
>>        {
>>          "name=94:"busMeta",
>>          "dataTypeName=94:"BusinessMetadata",
>>          =85
>>        },
>>        ...
>>      ]
>>    },
>>=20
>> and i would like to create an entity of =93BusinessMetaData=94 and =
then
>> associate it with an existing entity of Asset, what is the correct
>> syntax/json definition using REST API http:// =85api/atlas/entities =
-x PUT
>> . Or is there a documentation which can help?
>>=20
>> I tried to create the entity of =93BusinessMetaData=94 through REST =
API using
>> an entity definition of :
>> {
>>          "typeName":"BusinessMetaData",
>>          "values":{
>>            "category":"MiddleOffice",
>>            =85..
>>          }
>> }
>>=20
>> but got the following error:
>>=20
>> 2015-10-01 16:13:02,228 ERROR - [177746769@qtp-159259014-74 -
>> 82c2ab59-556a-4e62-979c-ef7711059fdb:] ~ Unable to deserialize json=3D{=

>> "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)
>> =85=85
>> 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(DefaultMetad=
ataService.java:229)
>>        at
>> =
org.apache.atlas.web.resources.EntityResource.submit(EntityResource.java:9=
6)
>>        at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown =
Source)
>>        at
>> =
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorIm=
pl.java:43)
>>=20
>>=20
>> Thanks
>> Herman
>>=20
>>=20


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