I'm struggling to understand what I'm doing wrong here.
I have an empty object:
if ( doc._attachments === undefined ){
doc._attachments = {};
}
var attmtid = 123;
which I'm trying to populate like so:
doc._attachments[attmtid].revpos = "abc";
However I keep getting an undefined error from Firebug:
doc._attachments[attmtid] is undefined
And can't really make any sense of it.
Question:
Can someone tell me what I'm doing wrong?
Thanks!
Why not do:
doc._attachments[attmtid] = {
revpos: "abc"
};
doc._attachments[attmtid] is undefined, which means you need to define it as something. An array, an object, a string, etc. For example, you could make it another object:
doc._attachments[attmtid] = {};
And then be able to set properties on that object:
doc._attachments[attmtid].revpos = "abc";
_doc.attachments and _doc.attachments[123] which makes sense since I need to keep track of different attachments to a single document.
undefined check for _doc.attachments[attmtid] before initializing, so you don't overwrite other properties.
var x = {}; x.y.z = 1; isn't going to work.doc._attachments[attmtid] is not initialized to an object so you cannot dynamically assign the revpos property.
This should resolve it:
doc._attachments[attmtid] = {};
doc._attachments[attmtid].revpos = "abc";
Note: This is based on the expectation that you want a doc._attachments.123 property (which is what the example code in the question would create) and not a doc._attachments.attmid property.
doc._attachments[attmtid] is undefined first - only if it is, then initialize it with {}. Then always set the revpos property.