Can pymongo detect if a collection is capped?

Question

I'm writing functionality in Python to ensure the existence, type, and size of mongodb collections. Most of these collections are capped. I know that the mongo shell includes mycollection.iscapped() , but pymongo does not seem to support this functionality.

Within the context of pymongo, what is the best way to tell if a collection is capped collection?

Answer 1

调用mycollection.options()返回一个带有'capped': True mycollection.options() 'capped': True的 dict 'capped': True如果它是一个有上限的集合，则为'capped': True 。

Answer 2

Found it.

# Where db is a pymongo database object
>>> db.command('collstats','mycollection')
{u'count': 308291, u'ns': u'mydb.mycollection', u'ok': 1.0, u'lastExtentSize': 83890176, u'avgObjSize': 256.10971452296695, u'max': 2147483647, u'totalIndexSize': 20407296, u'flags': 0, u'capped': 1, u'numExtents': 1, u'nindexes': 1, u'storageSize': 83890176, u'indexSizes': {u'tem_1_tbm_1_ip1_1_ip2_1_p2_1': 20407296}, u'paddingFactor': 1.0, u'size': 78956320}

Note 'capped': 1 .

Answer 3

To get a list of all the capped collections in my db I used:

def get_capped_collections(db):
    capped_collections = []
    for collcetion in db.collection_names():
        options = db[collection].options()
        if "capped" in options and options["capped"]:
            capped_collections.append(collection)
    return capped_collections