client = MongoClient()
db = client['test']
connection = db['test']
conn.insert({"tags": ["first_1", "second_1"]})
conn.insert({"tags": ["first_2", "second_1"]})
conn.insert({"tags": ["first_3", "second_2"]})
print conn.distinct("tags")
我得到了输出:
[u'first_1', u'second_1', u'first_2', u'first_3', u'second_2']
如何仅使用数组的第二个元素执行此操作?我需要类似的东西:
[u'second_1', u'second_2']