Choosing between embeds_many and references_many in Mongoid

Question

what are the key points that one should think of while choosing between embeds_many and references_many (or embeds_one and references_one) in Mongoid?

I'm currently preferring embeds_many over references_many, but that is resulting in too many nested embeds_many'ies and I'm worried that it might add unnecessary overhead to the database.

score 8 · Accepted Answer · edited May 14 '12 at 09:50

8

The most important thing to be aware of is the 4 MB limit for each document in MongoDB - by using references instead of embedding documents, you can keep the size of your documents lower.

Other information about the differences can be found here.

edited May 14 '12 at 09:50

crazycrv

2,395
2
19
20

answered Feb 16 '11 at 16:05

Rich

15,602
15
79
126

score 1 · Answer 2 · edited May 23 '17 at 11:48

1

I think that you should to use "entity-object" and "object-value" definitions from DDD. For entity use reference,but for "object-value" use embed document.

And check this question for more details about entity vs object-value.

edited May 23 '17 at 11:48

Community

1
1

answered Feb 17 '11 at 11:48

Andrei Andrushkevich

9,905
4
31
42

Choosing between embeds_many and references_many in Mongoid

2 Answers2