Hello, my documents have multiple fields, one of them is the “mailReceived”. When a user sends a message to another user, I want to add that message to the existing messages stored under mailReceived. Although this is an insertion (new message), in the context of MongoDB, I have to do an update instead of post (I’m not adding a new document, just updating an existing document using $set). But for the mailReceived field, doing an update will replace all the existing mail messages with the new message, no, I don’t want to do that. I just want to add the new message to the existing messages stored in mailReceived. Is there a quick way to achieve this ? Right now, I have to read all the existing messages out and then store them as a list, then append the new message to the list, then save everything back in, it’s cumbersome. Hopefully, there’s a quick way to do it in Java. I appreciate any help, thanks so much!
Look at the $push update operator.
Steeve,
Thanks a lot ! You are the man. I appreciate your assistance. It worked !
Hi Steeve,
During an update, to add a new message to the mailReceived field, I use $push. But now, instead of adding a new message, I want to delete an existing message from the mailReceived field while updating my document, is there something like $push for deletion? Could not find $delete/$remove from the MongoDB site. Thanks!
Thanks Steeve! (I just want to say thanks but it complains that my post has less than 20 characters 
Hopefully, my submission goes through this time)
I have to fight that do. I would write smaller post more often if I could. B-)
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