how to remove the element in an array according to index

[simon]

i have a table as the following:

{
username:"test1",
messages
[
{"date":123456,"content":"1 message"}
{"date":123456,"content":"2 message"}
{"date":123457,"content":"3 message"}
{"date":123457,"content":"4 message"}
]

}

now.I want to remove a element that's Index value is 2...how to do...

[simon]

There are some errors..

[Sam Millman]

You need to $unset the array element to null and the $pull the null value:

So to unset: update({$unset: { 'messages.2': 1 }}
Then to pull null: update({$pull: { 'messages': null }})

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[simon]

thank you..

On 3月12日, 下午5时11分, Sam Millman <sam.mill...@gmail.com> wrote:
> You need to $unset the array element to null and the $pull the null value:
>
> So to unset: update({$unset: { 'messages.2': 1 }}
> Then to pull null: update({$pull: { 'messages': null }})
>