在golang中无法通过ObjectId获取mongodb记录

以下是我的mongo收集样本

{ "_id" : ObjectId("5a2a75f777e864d018131a59"),"callDate" : "22/12/2017","time" : "16.25","callType" : "a","position" : "aaa","description" : "aaaaaa","qty" : 2,"estimatedDuration" : 2.3,"estimatedOvertime" : 3.44,"rate" : 4,"laborExtension" : 3 }
{ "_id" : ObjectId("5a2a75f877e864d018131a5b"),"laborExtension" : 3 }
{ "_id" : ObjectId("5a2a75fa77e864d018131a5d"),"laborExtension" : 3 }

以下是我的模特

type RhinoJobs struct { 
ID                bson.ObjectId  `db:"id" json:"id" bson:"_id"` 
CallDate          string  `db:"call_date" json:"callDate" bson:"callDate"` 
Time              string  `db:"time" json:"time" bson:"time"` 
CallType          string  `db:"call_type" json:"callType" bson:"callType"` 
Position          string  `db:"position" json:"position" bson:"position"` 
Description       string  `db:"description" json:"description" bson:"description"` 
Qty               int     `db:"qty" json:"qty" bson:"qty"` 
EstimatedDuration float64 `db:"estimated_duration" json:"estimatedDuration" bson:"estimatedDuration"` 
EstimatedOvertime float64 `db:"estimated_overtime" json:"estimatedOvertime" bson:"estimatedOvertime"` 
Rate              float64 `db:"rate" json:"rate" bson:"rate"` 
LaborExtension    float64 `db:"labor_extension" json:"laborExtension" bson:"laborExtension"` 
}

我想通过对象id搜索这些记录

"gopkg.in/mgo.v2"

func GetMongoSession() (*mgo.Session,error) {
    if mgoSession == nil {
        var err error
        mgoSession,err = mgo.Dial(mongoConnectionUrl)
        if err != nil {
            return nil,err
        }
    }
    return mgoSession.Clone(),nil
}



func GetJobByID(objID string) (models.RhinoJobs,error) {
    var job models.RhinoJobs
    s,err := commons.GetMongoSession()
    if err != nil {
        errMsg := "error occurred while creating mongoDB connection stack:" + err.Error()
        print(err.Error())
        return job,errors.New(errMsg)
    }
    defer s.Close()
    err = s.DB("rhino").C("jobs").FindId(bson.ObjectIdHex("5a2a75f777e864d018131a59")).One(&job)
    if err != nil {
        print(err.Error())
        errMsg := "error occurred while getting data :" + err.Error()
        return job,errors.New(errMsg)
    }
    return job,nil
}

但是当我尝试通过以下代码获取所有收集记录时,它工作正常

err := s.DB("rhino").C("jobs").Find(nil).All(&jobs)

我也检查了SO Q& A但是没有用

Querying mongodb from golang using the _id stored in an array

How to find by id in golang and mongodb

Cannot retrieve “_id” value using mgo with golang