Trying to find by ID

[Doug Barrett]

Hi, I'm trying to reference a document by it's ID.  This is the struct I have set up:

type Placement struct {

Id bson.ObjectId "_id.omitempty"

Title string "Title.omitempty"

Body string "Body.omitempty"

URL string "URL.omitempty"

Thumbnail string "Thumbnail.omitempty"

Paused bool "Paused"

Spread int "Spread.omitempty"

}

And when inserting data into MongoDB, this is the format I'm using:

newPlacement := Placement{

bson.NewObjectId(),

ctx.Params["Title"],

ctx.Params["Body"],

ctx.Params["URL"],

ctx.Params["Thumbnail"],

false,

spread,

}

That all seems to be working well, but I can't for the life of me load up a document by it's 'Id'.  This is the code I'm trying to use:

 

err := c.Find(bson.M{"Id" : bson.ObjectIdHex(id)}).One(&placement)

 

When that fires, I'm getting the error:  Handler crashed with error not found

I tried changing the code to:

err := c.Find(bson.M{"Id" : bson.ObjectIdHex(id)}).All(&placement)

But that's not returning any results, and I'm not getting an error.  I've looked at this thread: https://groups.google.com/forum/?fromgroups#!searchin/mgo-users/find$20by$20id/mgo-users/E3UGskD8oTc/2JJ-XeeNr8MJ but none of the methods bsr is using seems to work.

I'm pretty lost at this point, and am open to any suggestions.

Thank you!

[Doug Barrett]

I realized that I set the 'Id' to '_id' in MongoDB in the struct, so I assume that's what where MongoDB has saved the ID.  I changed how .Find() looks, and it still will not return any results.

[Gustavo Niemeyer]

On Fri, May 24, 2013 at 2:46 PM, Doug Barrett <doug.b....@gmail.com> wrote:
> I realized that I set the 'Id' to '_id' in MongoDB in the struct, so I
> assume that's what where MongoDB has saved the ID. I changed how .Find()
> looks, and it still will not return any results.

Please provide us with a tiny self-contained example, and we'll point
out what's happening.


gustavo @ http://niemeyer.net

[Gustavo Niemeyer]

On Fri, May 24, 2013 at 2:37 PM, Doug Barrett <doug.b....@gmail.com> wrote:
> Hi, I'm trying to reference a document by it's ID. This is the struct I
> have set up:
>
> type Placement struct {
> Id bson.ObjectId "_id.omitempty"

Actually, that's likely what's happening.

What separates the field name from the flags in the tag is a comma, not a dot.


gustavo @ http://niemeyer.net

[Doug Barrett]

Thank you very much! That was it Gustavo, I can't believe I didn't catch that.

Doug