Debugging Strategies

[sc28]

I have a relatively complex structure that when I execute the mgo query, nothing (but defaults) fill my struct.

For example:

type MyStruct {

    Verified          string `json:"DigitalSignature"`

    Immutable     ImmutableValues `json:"Immutable"`

    Mutable         Mutable 'json:"Mutable"`  

}

// values that cannot be changed

type Immutable struct {

   Organization        string `json:"Organization" bson:"Organization"`

   ...

}

type Mutable struct {

    Settings      AppSettings

    OtherStuff  OtherStuff

}

type Settings struct {

    EnableUpdates              bool   `json:"EnableUpdates" bson:"EnableUpdates"`

    ...

}

When I issue a mongo select statement (i.e.,  "Organization":"xyz") I can see the record is returned, but populating a struct only gives the default values, e.g.

...

var orgData MyStruct

err := mongoSession.DB("myDB").C("collection").Find(bson.M{"Organization":"xyz"}).One(&orgData)

... convert to json (MarshalIndent()..)

fmt.Println(string(bytes))  <-- only see the default struct values

To verify that I;m finding the record, I changed this:

var orgData interface{}

...

Now printing shows all the correct record values.

So obviously there is a mapping issue going on between my struct definitions and what is being returned - what is the best way to determine what s happening under the hood (a debugger here would be nice :-)  )

[Gustavo Niemeyer]

The debugging log in mgo is very comprehensive. You can enable it by doing:

    mgo.SetLogger(logger)

    mgo.SetDebug(true)

That logger value is obtained from the standard log package (log.New).

If you have a snippet that demonstrates your issue, I'm happy to look at it as well. Just make it self-contained please (should create the necessary data by itself).

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gustavo @ http://niemeyer.net