Example of defineInputSchema for multi-level inputs

Question

Hi,
I’m trying to create an input schema for my data source.  Here is an example input data format:

{ “data”: { “name”:“Andrew”, “value”:1}}

How do I represent this “layered” schema?  Can you provide an example?

del · Answer

Hey @andrew_holbrook,
I’ve played around with this code and I believe I found your solution.  Using your data sample from your original post:
You’ll need to import com.snaplogic.snap.schema.api.ObjectSchema into your class and then your code will look something like this:
private static final String DATA = "data";
private static final String NAME = "name";
private static final String VALUE = "value";
private static final String INPUT_VIEW_NAME = "input0";
private static final String OUTPUT_VIEW_NAME = "output0";

@Override
public void defineInputSchema(final SchemaProvider provider) {
    ObjectSchema data = provider.createSchema(SnapType.COMPOSITE, DATA);
    Schema name = provider.createSchema(SnapType.STRING, NAME);
    Schema value = provider.createSchema(SnapType.BOOLEAN, VALUE);
    data.addChild(name);
    data.addChild(value);
    provider.getSchemaBuilder(INPUT_VIEW_NAME)
            .withChildSchema(data)
            .build();
}

I don’t know if SnapType.COMPOSITE is the correct type, but it seems to work for me.

aleung · Answer

andrew_holbrook:

ce.  Here is an example input

here:
  {
    "DocumentRoot": {
      "Document": [
        {
          "Metadata": {
            "id": "e0408dd2-6564-11e5-a3cb-512b7ad797bd",
            "asMap": {
              "global": {
                "doc_id": "e0408dd2-6564-11e5-a3cb-512b7ad797bd"
              }
            }
          },
          "Data": {
            "id": "1",
            "first_name": "John",
            "last_name": "Doe",
            "gender": "M",
            "city": "Santa Ana",
            "state": "California",
            "street_address": "9 Melby Terrace",
            "zip_code": "92725"
          }
        },
        {
          "Metadata": {
            "id": "e0408dd3-6564-11e5-a3cb-512b7ad797bd",
            "asMap": {
              "global": {
                "doc_id": "e0408dd3-6564-11e5-a3cb-512b7ad797bd"
              }
            }
          },
          "Data": {
            "id": "2",
            "first_name": "Katy",
            "last_name": "Perry",
            "gender": "F",
            "city": "Flushing",
            "state": "New York",
            "street_address": "43 Golf View Street",
            "zip_code": "11355"
          }
        }
      ]
    }
  }

andrew_holbrook · Answer

@aleung (and I suppose @robin), thanks but what I’m looking for more of is how to change this function (pulled from here):
public void defineInputSchema(final SchemaProvider provider) {
        Schema colA = provider.createSchema(SnapType.STRING, COL_A);
        provider.getSchemaBuilder(INPUT_VIEW_NAME)
                .withChildSchema(colA)
                .build();
    }

How do I do a nested schema?

ryagnik · Answer

we had the same question but could not get any answer here, answer will be much appreciated here.

andrew_holbrook · Answer

Thanks!  Can’t wait to try this out!

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