如何使用mgo搜索空_id

Question

My structure

struct task {
  Id *bson.ObjectId `json:"id" bson:"_id,omitempty"`
  Text string `json:"text" bson:"text,omitempty"`
  // other params
}

Get data from form

var task Task{}
task.Text = FORM.Text

and my function to find tasks

func FindOne(task Task) (Task, error) {
    err := db.Session.DB("tasks").C(CollectionTask).Find(&task).One(&task)
    if err != nil {
        return task, err
    }

    return task, nil
}

From the search form I only get a line text, without a fieldid, in this case, _id -> nil and mgo (mongo) finds nothing not found

How do I modify the search function or structure of the data to carry out a correct search?

Answer 1

This is a working example based on your code. It first connects, then insert and finally find a specific string. As you see if you insert your documents correctly your search function works fine.

package main

import (
    "fmt"
    "log"

    "gopkg.in/mgo.v2"
    "gopkg.in/mgo.v2/bson"
)

type task struct {
    ID   *bson.ObjectId `json:"id" bson:"_id,omitempty"`
    Text string         `json:"text" bson:"text,omitempty"`
    // other params
}

func main() {
    session, err := mgo.Dial("127.0.0.1")
    if err != nil {
        log.Fatal(err)
    }

    c := session.DB("test").C("test")

    err = c.Insert(task{
        Text: "Hello",
    })
    if err != nil {
        log.Fatal(err)
    }

    var result task
    err = c.Find(task{
        ID:   nil,
        Text: "Hello",
    }).One(&result)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println(result)
}