CODEWITHSUNDEEP
javaspringmongodbspring-dataspring-data-mongodb
driangle
driangle

Reputation: 11779

Convert Spring Mongo Update to JSON String

I have an instance of an Update object and I would like to convert it to its String JSON representation so I can use it later.

I created the update object like this:

Update update = new Update();
update.set("field", new SomeClass());
update.unset("otherField");
// etc

My initial attempt was:

update.getUpdateObject().toString();

This approach worked for most cases but it failed occasionally because it could not serialize an instance of SomeClass. This was the stacktrace:

java.lang.RuntimeException: json can't serialize type : class com.example.SomeClass
at com.mongodb.util.JSON.serialize(JSON.java:261)
    at com.mongodb.util.JSON.serialize(JSON.java:115)
    at com.mongodb.util.JSON.serialize(JSON.java:161)
    at com.mongodb.util.JSON.serialize(JSON.java:141)
    at com.mongodb.util.JSON.serialize(JSON.java:58)
    at com.mongodb.BasicDBObject.toString(BasicDBObject.java:84)

I have available an instance of MongoTemplate and MongoConverter but I am unsure about how to use these classes to do this task.

The question is:

What's the correct way to get the JSON representation of an Update object?

I'm using spring-data-mongodb version 1.1.0.M1.

Upvotes: 4

Views: 3582

Answers (2)

Collin
Collin

Reputation: 103

I've met the same problem, and solved by turning SomeClass into DBObject:

DBObject dbObject = new BasicDBObject();
dbObject.put("fieldA", "a"); // set all fields of SomeClass
...

update.set("field", dbObject);

Upvotes: 0

Shreyas Dave
Shreyas Dave

Reputation: 3855

You can do this by using,

Update update = new Update();

JSONObject jsonObject = new JSONObject(new SomeClass());

update.set("field",JSON.parse(jsonObject.toString()));
update.unset("otherField");

System.out.println(update.getUpdateObject().toString());

Upvotes: 1

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