help with update embedded documents - mongodb

i hav an array of posts which you can see below"posts" : [ { "i" : "5ae245783da2df2c8fb8943c", "title" : "Sean", "chapters" : [ ] }, { "i" : "5ae2458c3da2df2c8fb8943d", "title" : "Paul", "chapters" : [ ] } ] how do i push an object into the chapters array of any given object. it mustn't affect all objects. im gonna be using the ids to update them do you know any methods to use?

Submitted April 26, 2018 at 11:10PM by SeanCarroll17