How to add index on ListField with mongoengine in python?

Question

I want to add index on ListField.Here is my code:

class Post(Document):

    meta = {"indexs":"testcomments.comment_id"}

    _id = StringField()
    txt = StringField()
    testcomments = EmbeddedDocumentField(Comment)
    comments = ListField(EmbeddedDocumentField(Comment))

class Comment(EmbeddedDocument):

    comment = StringField()
    comment_id = StringField()
    ...

...

I know how to add index on EmbeddedDocumentField (meta = {"indexs":"testcomments.comment_id"}),but how to add index on comments?

bagerard · Accepted Answer · 2019-05-10 20:54:25Z

1

I believe it would work the same way for the list, thus

meta = {
"indexes": [
    "testcomments.comment_id",
    "comments.comment_id",    # or simply 'comments' if you want a multikey index
    ]
}

Note that you can check the indexes being created with

col = Page._get_collection()
c.index_information()

If you use the dict form to define indexes e.g: meta = {'indexes': [{'fields': ['comments.comment_id']}}, you can have more granularity on the index definition (and syntax closer to pymongo/mongodb)

answered May 10, 2019 at 20:54

bagerard

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