validate fields in datamapper (CSV to JSON). - mule

Question

Converting from CSV to JSON using mule datamapper. I want to check if required field is empty. If empty log that field and discard it for further processing.
I know in script option we have if(input.data.length >0).'
But how to discard the whole row if this fails??

Answer 1

You can do this within mule datamapper simply by encapsulating the whole conversion within the if statements opening and closing braces. Something like this:
if ( input.Quantity > 0 ) {
output.id = input.id;
output.Customer = input.Customer;
output.Quantity = input.Quantity;
output.Price = input.Price;
}
However a different, perhaps better, approach would be to let the datamapper transform every row into JSON and then split and filter as seperate steps in the flow.
<flow name="filterindatamapperFlow2" doc:name="filterindatamapperFlow2">
<file:inbound-endpoint path="/tmp/inbox" doc:name="Inbound file"/>
<data-mapper:transform config-ref="CSV_To_UnfilteredJSON" doc:name="CSV To Unfiltered JSON"/>
<request-reply>
<vm:outbound-endpoint path="splittandprocess" exchange-pattern="one-way"/>
<vm:inbound-endpoint path="result"/>
</request-reply>
<json:object-to-json-transformer doc:name="Object to JSON"/>
<file:outbound-endpoint path="/tmp/outbox" doc:name="Outbound file"/>
</flow>
<flow name="splittandprocess">
<vm:inbound-endpoint path="splittandprocess" exchange-pattern="one-way"/>
<json:json-to-object-transformer returnClass="java.util.List" doc:name="JSON to Object"/>
<splitter expression="#[payload]" doc:name="Splitter"/>
<json:json-to-object-transformer returnClass="java.util.Map" doc:name="JSON to Object"/>
<message-filter doc:name="Filter Out Orders With No Quantity" onUnaccepted="handleFilteredMessages">
<expression-filter expression="#[payload['Quantity'] > 0]" />
</message-filter>
<collection-aggregator failOnTimeout="false" timeout="1000"/>
<vm:outbound-endpoint path="result" exchange-pattern="one-way"/>
</flow>
<flow name="handleFilteredMessages">
<logger message="Payload filtered #[payload]" level="ERROR" doc:name="Logger"/>
</flow>