deserializing bson arrays

[dave...@gmail.com]

I need to get user documents from MongoDB and unmarshall them into a struct defined like so

type user struct {

    email string

    password string

    loginHistory []bson.M{"timestamp": time.Time}

}

This fails to compile but I've tried many other things. What is the best way to do this? I've been trying to retrieve user documents like this

usr := user{}

err := users.Find(bson.M{"email":email, "password":password}).One(&usr)

This works when I leave on the loginHistory field but fails when I keep it. Thanks for the help.

Dave

[Dave Cheney]

Do the fields in your struct need to be exported?

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[dave...@gmail.com]

Yes, I'll fix that. But it still doesn't explain why the array isn't being unmarshaled. Thanks.

[dave...@gmail.com]

Maybe it would work if I used nested structs like this?

type lh struct {

    Timestamp time.Time

}

type user struct {

    Email string

    Password string

    LoginHistory []lh

}

And just to clarify, one of my user documents in Mongo looks like this

{

  "_id" : ObjectId("5104be6dda9b1413f4967052"),

  "email" : "te...@test.com",

  "loginHistory" : [{

      "timestamp" : new Date("1/27/2013 00:45:11")

    }, {

      "timestamp" : new Date("1/27/2013 00:45:43")

    }, {

      "timestamp" : new Date("1/27/2013 00:47:11")

    }],

  "password" : "p"

[Dave Cheney]

You keen using unexported structures, I'm pretty sure that is the cause of your problem. 

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[dave...@gmail.com]

My whole program is one package right now so I don't think it matters. The email and password fields are being unmarshalled just fine. The problem is the array of timestamps.

How can I deserialize this? It shouldn't be that hard should it?

[Gustavo Niemeyer]

Hi there,

On Sun, Jan 27, 2013 at 4:08 AM, <dave...@gmail.com> wrote:
> And just to clarify, one of my user documents in Mongo looks like this
>
>
> {
> "_id" : ObjectId("5104be6dda9b1413f4967052"),
> "email" : "te...@test.com",
> "loginHistory" : [{
> "timestamp" : new Date("1/27/2013 00:45:11")
> }, {
> "timestamp" : new Date("1/27/2013 00:45:43")
> }, {
> "timestamp" : new Date("1/27/2013 00:47:11")
> }],
> "password" : "p"
> }

You want types such as:

type Foo struct {
Id bson.ObjectId `bson:"_id"`
Email string
Password string
LoginHistory []LoginEntry `bson:"loginHistory"`
}

type LoginEntry struct {
Timestamp time.Time
}

gustavo @ http://niemeyer.net

[dave...@gmail.com]

You're awesome. Thanks!

On Sunday, January 27, 2013 12:34:09 AM UTC-5, dave...@gmail.com wrote:

[wri...@ldlibra.com]

I'm having the same problem as the OP, and am using the same solution you've provided, but I'm still getting an empty array back. Are there any other caveats known to make this work? Happy to post code if needed.

[Gustavo Niemeyer]

Sure, send it along and we'll have a look.

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[wri...@ldlibra.com]

Wow... After many hours of questing, I've realized I was querying a collection called 'sparx', when the desired collection was actually called 'sparxs'. Please forgive my wasting of your finger movements to respond *bows*. Have a grand eve!